./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9 --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 c328ca6a6071aea6db12d1e311bd2e5e22fce6c700c884e61df52925e139f834 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 20:22:42,624 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 20:22:42,627 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 20:22:42,661 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 20:22:42,665 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 20:22:42,670 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 20:22:42,673 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 20:22:42,685 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 20:22:42,688 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 20:22:42,697 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 20:22:42,698 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 20:22:42,700 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 20:22:42,700 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 20:22:42,701 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 20:22:42,701 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 20:22:42,703 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 20:22:42,704 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 20:22:42,705 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 20:22:42,707 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 20:22:42,709 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 20:22:42,711 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 20:22:42,713 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 20:22:42,714 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 20:22:42,715 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 20:22:42,719 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 20:22:42,720 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 20:22:42,720 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 20:22:42,721 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 20:22:42,722 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 20:22:42,723 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 20:22:42,724 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 20:22:42,725 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 20:22:42,726 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 20:22:42,727 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 20:22:42,728 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 20:22:42,728 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 20:22:42,729 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 20:22:42,730 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 20:22:42,730 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 20:22:42,731 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 20:22:42,732 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 20:22:42,734 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-20 20:22:42,760 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 20:22:42,760 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 20:22:42,761 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 20:22:42,761 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 20:22:42,762 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 20:22:42,762 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 20:22:42,762 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 20:22:42,763 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 20:22:42,763 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 20:22:42,763 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 20:22:42,763 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 20:22:42,764 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 20:22:42,764 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 20:22:42,764 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 20:22:42,764 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 20:22:42,765 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 20:22:42,765 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 20:22:42,765 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 20:22:42,766 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-20 20:22:42,766 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-20 20:22:42,767 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 20:22:42,767 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 20:22:42,767 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-20 20:22:42,767 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 20:22:42,768 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 20:22:42,768 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 20:22:42,768 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-20 20:22:42,768 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-20 20:22:42,769 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-20 20:22:42,769 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 20:22:42,769 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-20 20:22:42,770 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 20:22:42,770 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 20:22:42,770 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 20:22:42,770 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 20:22:42,771 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:22:42,771 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 20:22:42,771 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 20:22:42,772 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 20:22:42,772 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 20:22:42,772 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 20:22:42,772 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 20:22:42,773 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c328ca6a6071aea6db12d1e311bd2e5e22fce6c700c884e61df52925e139f834 [2022-11-20 20:22:43,152 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 20:22:43,193 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 20:22:43,196 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 20:22:43,199 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 20:22:43,199 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 20:22:43,201 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c [2022-11-20 20:22:46,386 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 20:22:46,635 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 20:22:46,635 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c [2022-11-20 20:22:46,643 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/data/f0ecd9256/3974f0cdaf9644458ea6abffb1ef98e3/FLAG4af5f7f97 [2022-11-20 20:22:46,658 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/data/f0ecd9256/3974f0cdaf9644458ea6abffb1ef98e3 [2022-11-20 20:22:46,661 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 20:22:46,663 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 20:22:46,664 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 20:22:46,665 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 20:22:46,669 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 20:22:46,670 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:22:46" (1/1) ... [2022-11-20 20:22:46,671 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d20d0bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:46, skipping insertion in model container [2022-11-20 20:22:46,671 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:22:46" (1/1) ... [2022-11-20 20:22:46,680 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 20:22:46,699 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 20:22:46,935 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c[2835,2848] [2022-11-20 20:22:46,947 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:22:46,960 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2022-11-20 20:22:46,961 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@554d75f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:46, skipping insertion in model container [2022-11-20 20:22:46,961 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 20:22:46,961 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-11-20 20:22:46,963 INFO L158 Benchmark]: Toolchain (without parser) took 299.36ms. Allocated memory is still 155.2MB. Free memory was 121.4MB in the beginning and 121.2MB in the end (delta: 277.7kB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2022-11-20 20:22:46,964 INFO L158 Benchmark]: CDTParser took 0.30ms. Allocated memory is still 123.7MB. Free memory is still 91.8MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-20 20:22:46,965 INFO L158 Benchmark]: CACSL2BoogieTranslator took 296.71ms. Allocated memory is still 155.2MB. Free memory was 121.4MB in the beginning and 121.2MB in the end (delta: 277.7kB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2022-11-20 20:22:46,966 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30ms. Allocated memory is still 123.7MB. Free memory is still 91.8MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 296.71ms. Allocated memory is still 155.2MB. Free memory was 121.4MB in the beginning and 121.2MB in the end (delta: 277.7kB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 115]: Unsupported Syntax Found a cast between two array/pointer types of different sizes 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/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9 --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 c328ca6a6071aea6db12d1e311bd2e5e22fce6c700c884e61df52925e139f834 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 20:22:49,546 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 20:22:49,549 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 20:22:49,602 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 20:22:49,603 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 20:22:49,607 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 20:22:49,610 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 20:22:49,614 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 20:22:49,616 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 20:22:49,622 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 20:22:49,624 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 20:22:49,625 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 20:22:49,626 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 20:22:49,629 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 20:22:49,631 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 20:22:49,636 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 20:22:49,640 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 20:22:49,641 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 20:22:49,643 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 20:22:49,648 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 20:22:49,650 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 20:22:49,652 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 20:22:49,655 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 20:22:49,656 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 20:22:49,659 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 20:22:49,659 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 20:22:49,660 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 20:22:49,661 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 20:22:49,661 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 20:22:49,662 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 20:22:49,662 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 20:22:49,663 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 20:22:49,664 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 20:22:49,664 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 20:22:49,665 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 20:22:49,665 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 20:22:49,666 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 20:22:49,666 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 20:22:49,666 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 20:22:49,667 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 20:22:49,668 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 20:22:49,672 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2022-11-20 20:22:49,713 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 20:22:49,714 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 20:22:49,715 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 20:22:49,715 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 20:22:49,716 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 20:22:49,716 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 20:22:49,716 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 20:22:49,716 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 20:22:49,717 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 20:22:49,717 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 20:22:49,718 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 20:22:49,718 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 20:22:49,719 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-20 20:22:49,719 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-20 20:22:49,719 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 20:22:49,719 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 20:22:49,720 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-20 20:22:49,720 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 20:22:49,720 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 20:22:49,720 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 20:22:49,720 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-20 20:22:49,721 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-20 20:22:49,721 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-20 20:22:49,721 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 20:22:49,721 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-20 20:22:49,721 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-11-20 20:22:49,722 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-11-20 20:22:49,722 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 20:22:49,722 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 20:22:49,722 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 20:22:49,722 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-20 20:22:49,723 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 20:22:49,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:22:49,723 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 20:22:49,723 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 20:22:49,724 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2022-11-20 20:22:49,724 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-11-20 20:22:49,724 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 20:22:49,725 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-11-20 20:22:49,725 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_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c328ca6a6071aea6db12d1e311bd2e5e22fce6c700c884e61df52925e139f834 [2022-11-20 20:22:50,180 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 20:22:50,216 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 20:22:50,218 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 20:22:50,220 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 20:22:50,222 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 20:22:50,223 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c [2022-11-20 20:22:53,520 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 20:22:53,731 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 20:22:53,732 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c [2022-11-20 20:22:53,740 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/data/6d873778e/f9d27de759264d77901b7dd590f061c0/FLAG3527d552d [2022-11-20 20:22:53,774 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/data/6d873778e/f9d27de759264d77901b7dd590f061c0 [2022-11-20 20:22:53,781 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 20:22:53,783 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 20:22:53,785 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 20:22:53,785 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 20:22:53,790 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 20:22:53,791 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:22:53" (1/1) ... [2022-11-20 20:22:53,793 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ae7f9d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:53, skipping insertion in model container [2022-11-20 20:22:53,793 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:22:53" (1/1) ... [2022-11-20 20:22:53,802 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 20:22:53,823 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 20:22:54,058 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c[2835,2848] [2022-11-20 20:22:54,073 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:22:54,088 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-11-20 20:22:54,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 20:22:54,110 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c[2835,2848] [2022-11-20 20:22:54,117 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:22:54,124 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 20:22:54,153 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/sv-benchmarks/c/weaver/popl20-more-array-sum.wvr.c[2835,2848] [2022-11-20 20:22:54,159 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:22:54,179 INFO L208 MainTranslator]: Completed translation [2022-11-20 20:22:54,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54 WrapperNode [2022-11-20 20:22:54,180 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 20:22:54,181 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 20:22:54,181 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 20:22:54,181 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 20:22:54,190 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,205 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,246 INFO L138 Inliner]: procedures = 27, calls = 58, calls flagged for inlining = 16, calls inlined = 28, statements flattened = 270 [2022-11-20 20:22:54,246 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 20:22:54,247 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 20:22:54,247 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 20:22:54,247 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 20:22:54,259 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,259 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,266 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,266 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,291 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,320 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,323 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,325 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,329 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 20:22:54,344 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 20:22:54,344 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 20:22:54,344 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 20:22:54,345 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (1/1) ... [2022-11-20 20:22:54,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:22:54,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:22:54,389 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 20:22:54,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 20:22:54,462 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 20:22:54,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-11-20 20:22:54,462 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-20 20:22:54,463 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-11-20 20:22:54,463 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2022-11-20 20:22:54,463 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2022-11-20 20:22:54,463 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2022-11-20 20:22:54,464 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2022-11-20 20:22:54,464 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2022-11-20 20:22:54,464 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2022-11-20 20:22:54,464 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2022-11-20 20:22:54,465 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2022-11-20 20:22:54,465 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-20 20:22:54,465 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 20:22:54,465 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 20:22:54,466 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-20 20:22:54,466 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-11-20 20:22:54,468 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-11-20 20:22:54,647 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 20:22:54,649 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 20:22:55,682 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 20:22:56,079 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 20:22:56,079 INFO L300 CfgBuilder]: Removed 5 assume(true) statements. [2022-11-20 20:22:56,086 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:22:56 BoogieIcfgContainer [2022-11-20 20:22:56,086 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 20:22:56,090 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 20:22:56,090 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 20:22:56,094 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 20:22:56,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 08:22:53" (1/3) ... [2022-11-20 20:22:56,096 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a468a8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:22:56, skipping insertion in model container [2022-11-20 20:22:56,097 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:22:54" (2/3) ... [2022-11-20 20:22:56,099 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a468a8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:22:56, skipping insertion in model container [2022-11-20 20:22:56,100 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:22:56" (3/3) ... [2022-11-20 20:22:56,102 INFO L112 eAbstractionObserver]: Analyzing ICFG popl20-more-array-sum.wvr.c [2022-11-20 20:22:56,124 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 20:22:56,124 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 30 error locations. [2022-11-20 20:22:56,125 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-11-20 20:22:56,279 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2022-11-20 20:22:56,337 INFO L115 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2022-11-20 20:22:56,361 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 218 places, 224 transitions, 472 flow [2022-11-20 20:22:56,365 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 218 places, 224 transitions, 472 flow [2022-11-20 20:22:56,367 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 218 places, 224 transitions, 472 flow [2022-11-20 20:22:56,460 INFO L130 PetriNetUnfolder]: 16/221 cut-off events. [2022-11-20 20:22:56,461 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2022-11-20 20:22:56,469 INFO L83 FinitePrefix]: Finished finitePrefix Result has 234 conditions, 221 events. 16/221 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 238 event pairs, 0 based on Foata normal form. 0/175 useless extension candidates. Maximal degree in co-relation 169. Up to 2 conditions per place. [2022-11-20 20:22:56,472 INFO L119 LiptonReduction]: Number of co-enabled transitions 2970 [2022-11-20 20:23:43,789 INFO L134 LiptonReduction]: Checked pairs total: 4649 [2022-11-20 20:23:43,789 INFO L136 LiptonReduction]: Total number of compositions: 228 [2022-11-20 20:23:43,797 INFO L113 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 66 places, 61 transitions, 146 flow [2022-11-20 20:23:43,962 INFO L135 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 2345 states, 1843 states have (on average 4.500813890396094) internal successors, (8295), 2344 states have internal predecessors, (8295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:43,990 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 20:23:44,000 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@25569ec8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 20:23:44,000 INFO L358 AbstractCegarLoop]: Starting to check reachability of 45 error locations. [2022-11-20 20:23:44,023 INFO L276 IsEmpty]: Start isEmpty. Operand has 2345 states, 1843 states have (on average 4.500813890396094) internal successors, (8295), 2344 states have internal predecessors, (8295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:44,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-20 20:23:44,029 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:23:44,030 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-20 20:23:44,031 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:23:44,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:23:44,037 INFO L85 PathProgramCache]: Analyzing trace with hash 38976, now seen corresponding path program 1 times [2022-11-20 20:23:44,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:23:44,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [724276609] [2022-11-20 20:23:44,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:23:44,053 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:44,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:23:44,055 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:23:44,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-11-20 20:23:44,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:23:44,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 20:23:44,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:23:44,364 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:23:44,365 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:23:44,396 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:23:44,397 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:23:44,398 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:23:44,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [724276609] [2022-11-20 20:23:44,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [724276609] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:23:44,399 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:23:44,399 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 20:23:44,401 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130307172] [2022-11-20 20:23:44,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:23:44,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:23:44,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:23:44,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:23:44,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:23:44,444 INFO L87 Difference]: Start difference. First operand has 2345 states, 1843 states have (on average 4.500813890396094) internal successors, (8295), 2344 states have internal predecessors, (8295), 0 states have call successors, (0), 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 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:44,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:23:44,911 INFO L93 Difference]: Finished difference Result 2342 states and 8292 transitions. [2022-11-20 20:23:44,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:23:44,914 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 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 2 [2022-11-20 20:23:44,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:23:44,977 INFO L225 Difference]: With dead ends: 2342 [2022-11-20 20:23:44,977 INFO L226 Difference]: Without dead ends: 2342 [2022-11-20 20:23:44,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:23:44,984 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 52 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:23:44,996 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 3 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 20:23:45,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2342 states. [2022-11-20 20:23:45,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2342 to 2342. [2022-11-20 20:23:45,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2342 states, 1843 states have (on average 4.499186109603906) internal successors, (8292), 2341 states have internal predecessors, (8292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:45,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2342 states to 2342 states and 8292 transitions. [2022-11-20 20:23:45,256 INFO L78 Accepts]: Start accepts. Automaton has 2342 states and 8292 transitions. Word has length 2 [2022-11-20 20:23:45,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:23:45,259 INFO L495 AbstractCegarLoop]: Abstraction has 2342 states and 8292 transitions. [2022-11-20 20:23:45,260 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:45,261 INFO L276 IsEmpty]: Start isEmpty. Operand 2342 states and 8292 transitions. [2022-11-20 20:23:45,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-20 20:23:45,265 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:23:45,266 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-20 20:23:45,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-11-20 20:23:45,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:45,481 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:23:45,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:23:45,482 INFO L85 PathProgramCache]: Analyzing trace with hash 38977, now seen corresponding path program 1 times [2022-11-20 20:23:45,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:23:45,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1092219234] [2022-11-20 20:23:45,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:23:45,483 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:45,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:23:45,485 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:23:45,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-11-20 20:23:45,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:23:45,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:23:45,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:23:45,812 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:23:45,813 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:23:45,858 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:23:45,858 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:23:45,858 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:23:45,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1092219234] [2022-11-20 20:23:45,859 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1092219234] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:23:45,859 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:23:45,859 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 20:23:45,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838998985] [2022-11-20 20:23:45,860 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:23:45,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:23:45,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:23:45,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:23:45,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:23:45,862 INFO L87 Difference]: Start difference. First operand 2342 states and 8292 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:46,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:23:46,726 INFO L93 Difference]: Finished difference Result 4681 states and 16581 transitions. [2022-11-20 20:23:46,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:23:46,727 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 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 2 [2022-11-20 20:23:46,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:23:46,771 INFO L225 Difference]: With dead ends: 4681 [2022-11-20 20:23:46,771 INFO L226 Difference]: Without dead ends: 4681 [2022-11-20 20:23:46,772 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:23:46,780 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 48 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-20 20:23:46,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 6 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-20 20:23:46,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4681 states. [2022-11-20 20:23:47,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4681 to 2344. [2022-11-20 20:23:47,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2344 states, 1845 states have (on average 4.4975609756097565) internal successors, (8298), 2343 states have internal predecessors, (8298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:47,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2344 states to 2344 states and 8298 transitions. [2022-11-20 20:23:47,161 INFO L78 Accepts]: Start accepts. Automaton has 2344 states and 8298 transitions. Word has length 2 [2022-11-20 20:23:47,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:23:47,162 INFO L495 AbstractCegarLoop]: Abstraction has 2344 states and 8298 transitions. [2022-11-20 20:23:47,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:47,162 INFO L276 IsEmpty]: Start isEmpty. Operand 2344 states and 8298 transitions. [2022-11-20 20:23:47,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 20:23:47,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:23:47,175 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 20:23:47,196 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Ended with exit code 0 [2022-11-20 20:23:47,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:47,376 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:23:47,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:23:47,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1212203, now seen corresponding path program 1 times [2022-11-20 20:23:47,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:23:47,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [428367929] [2022-11-20 20:23:47,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:23:47,378 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:47,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:23:47,380 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:23:47,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-11-20 20:23:47,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:23:47,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:23:47,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:23:47,692 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:23:47,692 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:23:47,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:23:47,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:23:48,212 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:23:48,212 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:23:48,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [428367929] [2022-11-20 20:23:48,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [428367929] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:23:48,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1530521075] [2022-11-20 20:23:48,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:23:48,213 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:23:48,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:23:48,219 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:23:48,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2022-11-20 20:23:48,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:23:48,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:23:48,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:23:48,565 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:23:48,565 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:23:48,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:23:48,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:23:48,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:23:48,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1530521075] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:23:48,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402584157] [2022-11-20 20:23:48,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:23:48,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:23:48,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:23:48,726 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:23:48,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 20:23:48,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:23:48,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 20:23:48,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:23:49,045 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:23:49,045 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:23:49,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:23:49,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:23:49,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:23:49,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402584157] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:23:49,331 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:23:49,332 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2, 2, 2, 2] total 6 [2022-11-20 20:23:49,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377351423] [2022-11-20 20:23:49,332 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:23:49,332 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 20:23:49,333 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:23:49,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 20:23:49,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:23:49,334 INFO L87 Difference]: Start difference. First operand 2344 states and 8298 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 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) [2022-11-20 20:23:50,926 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:23:53,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:23:53,298 INFO L93 Difference]: Finished difference Result 9361 states and 33165 transitions. [2022-11-20 20:23:53,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:23:53,300 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 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 3 [2022-11-20 20:23:53,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:23:53,377 INFO L225 Difference]: With dead ends: 9361 [2022-11-20 20:23:53,377 INFO L226 Difference]: Without dead ends: 9361 [2022-11-20 20:23:53,377 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2022-11-20 20:23:53,378 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 525 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 525 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:23:53,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [525 Valid, 15 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-11-20 20:23:53,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9361 states. [2022-11-20 20:23:53,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9361 to 2350. [2022-11-20 20:23:53,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2350 states, 1851 states have (on average 4.492706645056726) internal successors, (8316), 2349 states have internal predecessors, (8316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:53,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2350 states to 2350 states and 8316 transitions. [2022-11-20 20:23:53,836 INFO L78 Accepts]: Start accepts. Automaton has 2350 states and 8316 transitions. Word has length 3 [2022-11-20 20:23:53,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:23:53,838 INFO L495 AbstractCegarLoop]: Abstraction has 2350 states and 8316 transitions. [2022-11-20 20:23:53,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 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) [2022-11-20 20:23:53,841 INFO L276 IsEmpty]: Start isEmpty. Operand 2350 states and 8316 transitions. [2022-11-20 20:23:53,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 20:23:53,842 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:23:53,843 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 20:23:53,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 20:23:54,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-11-20 20:23:54,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2022-11-20 20:23:54,444 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:23:54,444 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:23:54,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:23:54,445 INFO L85 PathProgramCache]: Analyzing trace with hash 1213413, now seen corresponding path program 1 times [2022-11-20 20:23:54,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:23:54,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [320478725] [2022-11-20 20:23:54,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:23:54,445 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:54,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:23:54,447 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:23:54,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-11-20 20:23:54,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:23:54,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 20:23:54,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:23:54,609 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:23:54,609 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:23:54,610 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:23:54,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [320478725] [2022-11-20 20:23:54,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [320478725] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:23:54,610 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:23:54,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:23:54,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424290842] [2022-11-20 20:23:54,611 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:23:54,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:23:54,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:23:54,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:23:54,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:23:54,613 INFO L87 Difference]: Start difference. First operand 2350 states and 8316 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:55,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:23:55,266 INFO L93 Difference]: Finished difference Result 2351 states and 8313 transitions. [2022-11-20 20:23:55,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:23:55,267 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 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 3 [2022-11-20 20:23:55,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:23:55,280 INFO L225 Difference]: With dead ends: 2351 [2022-11-20 20:23:55,281 INFO L226 Difference]: Without dead ends: 2350 [2022-11-20 20:23:55,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:23:55,282 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:23:55,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 20:23:55,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2350 states. [2022-11-20 20:23:55,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2350 to 2350. [2022-11-20 20:23:55,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2350 states, 1851 states have (on average 4.49054565099946) internal successors, (8312), 2349 states have internal predecessors, (8312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:55,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2350 states to 2350 states and 8312 transitions. [2022-11-20 20:23:55,405 INFO L78 Accepts]: Start accepts. Automaton has 2350 states and 8312 transitions. Word has length 3 [2022-11-20 20:23:55,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:23:55,405 INFO L495 AbstractCegarLoop]: Abstraction has 2350 states and 8312 transitions. [2022-11-20 20:23:55,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:55,406 INFO L276 IsEmpty]: Start isEmpty. Operand 2350 states and 8312 transitions. [2022-11-20 20:23:55,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-20 20:23:55,406 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:23:55,407 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-20 20:23:55,425 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (7)] Ended with exit code 0 [2022-11-20 20:23:55,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:55,619 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:23:55,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:23:55,620 INFO L85 PathProgramCache]: Analyzing trace with hash 1165085287, now seen corresponding path program 1 times [2022-11-20 20:23:55,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:23:55,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1709088021] [2022-11-20 20:23:55,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:23:55,621 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:55,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:23:55,622 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:23:55,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-11-20 20:23:55,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:23:55,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:23:55,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:23:55,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:55,911 INFO L321 Elim1Store]: treesize reduction 86, result has 25.9 percent of original size [2022-11-20 20:23:55,911 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 6 case distinctions, treesize of input 38 treesize of output 55 [2022-11-20 20:23:56,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:56,448 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-20 20:23:56,449 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 32 [2022-11-20 20:23:56,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:23:56,648 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:23:56,649 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:23:56,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1709088021] [2022-11-20 20:23:56,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1709088021] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:23:56,649 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:23:56,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:23:56,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934294105] [2022-11-20 20:23:56,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:23:56,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:23:56,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:23:56,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:23:56,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:23:56,651 INFO L87 Difference]: Start difference. First operand 2350 states and 8312 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:56,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:23:56,993 INFO L93 Difference]: Finished difference Result 2349 states and 8308 transitions. [2022-11-20 20:23:56,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:23:56,994 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-20 20:23:56,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:23:57,008 INFO L225 Difference]: With dead ends: 2349 [2022-11-20 20:23:57,009 INFO L226 Difference]: Without dead ends: 2349 [2022-11-20 20:23:57,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:23:57,010 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:23:57,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 92 Unchecked, 0.3s Time] [2022-11-20 20:23:57,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2349 states. [2022-11-20 20:23:57,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2349 to 2349. [2022-11-20 20:23:57,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2349 states, 1851 states have (on average 4.488384656942193) internal successors, (8308), 2348 states have internal predecessors, (8308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:57,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2349 states to 2349 states and 8308 transitions. [2022-11-20 20:23:57,099 INFO L78 Accepts]: Start accepts. Automaton has 2349 states and 8308 transitions. Word has length 5 [2022-11-20 20:23:57,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:23:57,099 INFO L495 AbstractCegarLoop]: Abstraction has 2349 states and 8308 transitions. [2022-11-20 20:23:57,100 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:57,100 INFO L276 IsEmpty]: Start isEmpty. Operand 2349 states and 8308 transitions. [2022-11-20 20:23:57,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-20 20:23:57,100 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:23:57,101 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-20 20:23:57,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-11-20 20:23:57,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:57,315 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:23:57,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:23:57,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1165085288, now seen corresponding path program 1 times [2022-11-20 20:23:57,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:23:57,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [143087439] [2022-11-20 20:23:57,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:23:57,317 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:23:57,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:23:57,323 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:23:57,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-11-20 20:23:57,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:23:57,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-20 20:23:57,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:23:57,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:57,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:57,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:57,701 INFO L321 Elim1Store]: treesize reduction 37, result has 37.3 percent of original size [2022-11-20 20:23:57,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 34 [2022-11-20 20:23:57,757 INFO L321 Elim1Store]: treesize reduction 5, result has 50.0 percent of original size [2022-11-20 20:23:57,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 45 [2022-11-20 20:23:58,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:58,108 INFO L321 Elim1Store]: treesize reduction 32, result has 25.6 percent of original size [2022-11-20 20:23:58,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 26 [2022-11-20 20:23:58,275 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:23:58,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:23:58,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:23:58,741 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:23:58,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [143087439] [2022-11-20 20:23:58,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [143087439] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:23:58,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1541641228] [2022-11-20 20:23:58,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:23:58,742 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:23:58,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:23:58,743 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:23:58,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2022-11-20 20:23:59,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:23:59,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:23:59,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:23:59,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:59,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:59,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:59,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:59,155 INFO L321 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2022-11-20 20:23:59,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 29 [2022-11-20 20:23:59,205 INFO L321 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-11-20 20:23:59,205 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 19 [2022-11-20 20:23:59,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:23:59,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-20 20:23:59,456 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:23:59,456 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:23:59,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1541641228] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:23:59,456 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:23:59,456 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3, 3] total 8 [2022-11-20 20:23:59,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876293581] [2022-11-20 20:23:59,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:23:59,457 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:23:59,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:23:59,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:23:59,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2022-11-20 20:23:59,458 INFO L87 Difference]: Start difference. First operand 2349 states and 8308 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:59,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:23:59,849 INFO L93 Difference]: Finished difference Result 1900 states and 6512 transitions. [2022-11-20 20:23:59,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:23:59,850 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-20 20:23:59,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:23:59,859 INFO L225 Difference]: With dead ends: 1900 [2022-11-20 20:23:59,859 INFO L226 Difference]: Without dead ends: 1900 [2022-11-20 20:23:59,860 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2022-11-20 20:23:59,860 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 96 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:23:59,861 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 3 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 1 Unchecked, 0.4s Time] [2022-11-20 20:23:59,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1900 states. [2022-11-20 20:23:59,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1900 to 1900. [2022-11-20 20:23:59,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1900 states, 1528 states have (on average 4.261780104712042) internal successors, (6512), 1899 states have internal predecessors, (6512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:59,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1900 states to 1900 states and 6512 transitions. [2022-11-20 20:23:59,928 INFO L78 Accepts]: Start accepts. Automaton has 1900 states and 6512 transitions. Word has length 5 [2022-11-20 20:23:59,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:23:59,929 INFO L495 AbstractCegarLoop]: Abstraction has 1900 states and 6512 transitions. [2022-11-20 20:23:59,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:23:59,929 INFO L276 IsEmpty]: Start isEmpty. Operand 1900 states and 6512 transitions. [2022-11-20 20:23:59,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 20:23:59,930 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:23:59,930 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1] [2022-11-20 20:23:59,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2022-11-20 20:24:00,148 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (9)] Ended with exit code 0 [2022-11-20 20:24:00,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:24:00,340 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:24:00,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:24:00,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1756889793, now seen corresponding path program 2 times [2022-11-20 20:24:00,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:24:00,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [342851140] [2022-11-20 20:24:00,341 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:24:00,341 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:24:00,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:24:00,342 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:24:00,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2022-11-20 20:24:00,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:24:00,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:24:00,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:24:00,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:00,642 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:24:00,643 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:24:00,843 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:24:00,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:24:01,788 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:24:01,788 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:24:01,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [342851140] [2022-11-20 20:24:01,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [342851140] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:24:01,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1712069757] [2022-11-20 20:24:01,789 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:24:01,789 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:24:01,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:24:01,790 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:24:01,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2022-11-20 20:24:02,087 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:24:02,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:24:02,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:24:02,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:02,281 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:24:02,282 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:24:02,428 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:24:02,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:24:03,563 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:24:03,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1712069757] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:24:03,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662279422] [2022-11-20 20:24:03,564 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:24:03,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:24:03,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:24:03,565 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:24:03,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-20 20:24:03,701 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:24:03,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:24:03,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:24:03,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:03,871 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:24:03,871 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:24:03,957 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:24:03,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:24:04,210 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:24:04,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662279422] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:24:04,211 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:24:04,211 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 15 [2022-11-20 20:24:04,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765163303] [2022-11-20 20:24:04,211 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:24:04,212 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-20 20:24:04,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:24:04,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-20 20:24:04,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=182, Unknown=0, NotChecked=0, Total=272 [2022-11-20 20:24:04,213 INFO L87 Difference]: Start difference. First operand 1900 states and 6512 transitions. Second operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:08,995 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:10,998 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:12,454 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:13,543 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:15,544 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:17,317 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.75s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:19,319 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:22,443 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:23,570 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:25,475 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.88s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:27,957 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.73s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:30,543 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.78s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:24:37,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:24:37,759 INFO L93 Difference]: Finished difference Result 17011 states and 58467 transitions. [2022-11-20 20:24:37,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-20 20:24:37,761 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 20:24:37,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:24:37,925 INFO L225 Difference]: With dead ends: 17011 [2022-11-20 20:24:37,926 INFO L226 Difference]: Without dead ends: 17011 [2022-11-20 20:24:37,927 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=194, Invalid=358, Unknown=0, NotChecked=0, Total=552 [2022-11-20 20:24:37,928 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1533 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 1572 mSolverCounterSat, 74 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1533 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 1651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 1572 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.9s IncrementalHoareTripleChecker+Time [2022-11-20 20:24:37,928 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1533 Valid, 102 Invalid, 1651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 1572 Invalid, 5 Unknown, 0 Unchecked, 30.9s Time] [2022-11-20 20:24:37,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17011 states. [2022-11-20 20:24:38,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17011 to 1912. [2022-11-20 20:24:38,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1912 states, 1540 states have (on average 4.246103896103896) internal successors, (6539), 1911 states have internal predecessors, (6539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:38,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1912 states to 1912 states and 6539 transitions. [2022-11-20 20:24:38,168 INFO L78 Accepts]: Start accepts. Automaton has 1912 states and 6539 transitions. Word has length 6 [2022-11-20 20:24:38,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:24:38,169 INFO L495 AbstractCegarLoop]: Abstraction has 1912 states and 6539 transitions. [2022-11-20 20:24:38,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:38,169 INFO L276 IsEmpty]: Start isEmpty. Operand 1912 states and 6539 transitions. [2022-11-20 20:24:38,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 20:24:38,170 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:24:38,170 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:24:38,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2022-11-20 20:24:38,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2022-11-20 20:24:38,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-20 20:24:38,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:24:38,793 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:24:38,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:24:38,794 INFO L85 PathProgramCache]: Analyzing trace with hash -1339473600, now seen corresponding path program 1 times [2022-11-20 20:24:38,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:24:38,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2036924515] [2022-11-20 20:24:38,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:24:38,794 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:24:38,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:24:38,796 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:24:38,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2022-11-20 20:24:38,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:24:38,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-20 20:24:38,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:39,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:39,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:39,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:39,205 INFO L321 Elim1Store]: treesize reduction 37, result has 37.3 percent of original size [2022-11-20 20:24:39,206 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 34 [2022-11-20 20:24:39,231 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 12 [2022-11-20 20:24:39,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:39,507 INFO L321 Elim1Store]: treesize reduction 32, result has 25.6 percent of original size [2022-11-20 20:24:39,507 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 26 [2022-11-20 20:24:39,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:24:39,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:24:40,199 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:24:40,199 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:24:40,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2036924515] [2022-11-20 20:24:40,200 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2036924515] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:24:40,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [293128857] [2022-11-20 20:24:40,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:24:40,200 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:24:40,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:24:40,201 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:24:40,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2022-11-20 20:24:40,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:24:40,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 20:24:40,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:40,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:40,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:40,663 INFO L321 Elim1Store]: treesize reduction 49, result has 33.8 percent of original size [2022-11-20 20:24:40,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 35 [2022-11-20 20:24:40,682 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 24 [2022-11-20 20:24:40,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:40,801 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-20 20:24:40,978 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:24:40,979 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:24:40,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [293128857] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:24:40,979 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:24:40,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3, 3] total 8 [2022-11-20 20:24:40,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511722667] [2022-11-20 20:24:40,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:24:40,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:24:40,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:24:40,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:24:40,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2022-11-20 20:24:40,981 INFO L87 Difference]: Start difference. First operand 1912 states and 6539 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:41,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:24:41,334 INFO L93 Difference]: Finished difference Result 1841 states and 6333 transitions. [2022-11-20 20:24:41,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:24:41,335 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 20:24:41,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:24:41,342 INFO L225 Difference]: With dead ends: 1841 [2022-11-20 20:24:41,342 INFO L226 Difference]: Without dead ends: 1841 [2022-11-20 20:24:41,342 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2022-11-20 20:24:41,343 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 47 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:24:41,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 3 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 46 Invalid, 0 Unknown, 1 Unchecked, 0.3s Time] [2022-11-20 20:24:41,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1841 states. [2022-11-20 20:24:41,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1841 to 1841. [2022-11-20 20:24:41,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1841 states, 1499 states have (on average 4.224816544362908) internal successors, (6333), 1840 states have internal predecessors, (6333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:41,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1841 states to 1841 states and 6333 transitions. [2022-11-20 20:24:41,425 INFO L78 Accepts]: Start accepts. Automaton has 1841 states and 6333 transitions. Word has length 7 [2022-11-20 20:24:41,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:24:41,426 INFO L495 AbstractCegarLoop]: Abstraction has 1841 states and 6333 transitions. [2022-11-20 20:24:41,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:41,426 INFO L276 IsEmpty]: Start isEmpty. Operand 1841 states and 6333 transitions. [2022-11-20 20:24:41,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 20:24:41,427 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:24:41,427 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:24:41,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2022-11-20 20:24:41,639 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (14)] Ended with exit code 0 [2022-11-20 20:24:41,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:24:41,831 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:24:41,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:24:41,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1339473599, now seen corresponding path program 1 times [2022-11-20 20:24:41,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:24:41,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [110212597] [2022-11-20 20:24:41,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:24:41,832 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:24:41,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:24:41,833 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:24:41,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-11-20 20:24:42,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:24:42,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:24:42,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:42,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:42,110 INFO L321 Elim1Store]: treesize reduction 79, result has 27.5 percent of original size [2022-11-20 20:24:42,110 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 48 [2022-11-20 20:24:42,548 INFO L321 Elim1Store]: treesize reduction 42, result has 26.3 percent of original size [2022-11-20 20:24:42,548 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 32 [2022-11-20 20:24:42,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:24:42,738 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:24:42,738 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:24:42,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [110212597] [2022-11-20 20:24:42,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [110212597] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:24:42,739 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:24:42,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 20:24:42,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291694874] [2022-11-20 20:24:42,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:24:42,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:24:42,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:24:42,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:24:42,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:24:42,741 INFO L87 Difference]: Start difference. First operand 1841 states and 6333 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:42,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:24:42,958 INFO L93 Difference]: Finished difference Result 1841 states and 6338 transitions. [2022-11-20 20:24:42,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:24:42,959 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 20:24:42,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:24:42,967 INFO L225 Difference]: With dead ends: 1841 [2022-11-20 20:24:42,967 INFO L226 Difference]: Without dead ends: 1841 [2022-11-20 20:24:42,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:24:42,968 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:24:42,969 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 6 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 45 Unchecked, 0.2s Time] [2022-11-20 20:24:42,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1841 states. [2022-11-20 20:24:43,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1841 to 1841. [2022-11-20 20:24:43,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1841 states, 1499 states have (on average 4.228152101400934) internal successors, (6338), 1840 states have internal predecessors, (6338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:43,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1841 states to 1841 states and 6338 transitions. [2022-11-20 20:24:43,025 INFO L78 Accepts]: Start accepts. Automaton has 1841 states and 6338 transitions. Word has length 7 [2022-11-20 20:24:43,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:24:43,026 INFO L495 AbstractCegarLoop]: Abstraction has 1841 states and 6338 transitions. [2022-11-20 20:24:43,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:43,026 INFO L276 IsEmpty]: Start isEmpty. Operand 1841 states and 6338 transitions. [2022-11-20 20:24:43,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 20:24:43,027 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:24:43,027 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:24:43,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2022-11-20 20:24:43,248 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:24:43,249 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:24:43,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:24:43,249 INFO L85 PathProgramCache]: Analyzing trace with hash 1425985203, now seen corresponding path program 1 times [2022-11-20 20:24:43,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:24:43,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1211741488] [2022-11-20 20:24:43,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:24:43,250 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:24:43,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:24:43,252 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:24:43,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2022-11-20 20:24:43,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:24:43,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:24:43,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:43,539 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:24:43,540 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:24:43,581 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-20 20:24:43,581 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 27 [2022-11-20 20:24:43,605 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:24:43,605 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:24:43,605 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:24:43,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1211741488] [2022-11-20 20:24:43,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1211741488] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:24:43,606 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:24:43,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:24:43,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434821707] [2022-11-20 20:24:43,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:24:43,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:24:43,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:24:43,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:24:43,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:24:43,607 INFO L87 Difference]: Start difference. First operand 1841 states and 6338 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:43,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:24:43,930 INFO L93 Difference]: Finished difference Result 1271 states and 4326 transitions. [2022-11-20 20:24:43,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:24:43,930 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-20 20:24:43,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:24:43,934 INFO L225 Difference]: With dead ends: 1271 [2022-11-20 20:24:43,934 INFO L226 Difference]: Without dead ends: 1271 [2022-11-20 20:24:43,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:24:43,935 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 81 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:24:43,935 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 3 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:24:43,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1271 states. [2022-11-20 20:24:43,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1271 to 1271. [2022-11-20 20:24:43,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1271 states, 1081 states have (on average 4.001850138760407) internal successors, (4326), 1270 states have internal predecessors, (4326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:43,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1271 states to 1271 states and 4326 transitions. [2022-11-20 20:24:43,972 INFO L78 Accepts]: Start accepts. Automaton has 1271 states and 4326 transitions. Word has length 8 [2022-11-20 20:24:43,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:24:43,973 INFO L495 AbstractCegarLoop]: Abstraction has 1271 states and 4326 transitions. [2022-11-20 20:24:43,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:24:43,973 INFO L276 IsEmpty]: Start isEmpty. Operand 1271 states and 4326 transitions. [2022-11-20 20:24:43,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 20:24:43,974 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:24:43,974 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:24:43,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2022-11-20 20:24:44,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:24:44,175 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:24:44,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:24:44,175 INFO L85 PathProgramCache]: Analyzing trace with hash 1425985204, now seen corresponding path program 1 times [2022-11-20 20:24:44,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:24:44,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [998742317] [2022-11-20 20:24:44,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:24:44,176 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:24:44,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:24:44,177 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:24:44,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2022-11-20 20:24:44,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:24:44,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:24:44,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:44,526 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:24:44,526 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:24:44,718 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:24:44,719 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:24:44,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:44,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:24:44,927 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:24:44,928 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:24:45,059 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:24:45,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:24:48,268 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:24:48,268 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:24:48,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [998742317] [2022-11-20 20:24:48,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [998742317] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:24:48,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [141392221] [2022-11-20 20:24:48,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:24:48,269 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:24:48,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:24:48,270 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:24:48,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2022-11-20 20:24:48,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:24:48,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:24:48,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:48,736 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:24:48,736 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:24:48,901 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:24:48,901 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:24:49,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:24:49,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:24:49,129 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:24:49,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:24:49,423 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:24:49,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:24:54,348 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:24:54,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [141392221] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:24:54,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412697347] [2022-11-20 20:24:54,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:24:54,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:24:54,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:24:54,350 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:24:54,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-20 20:24:54,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:24:54,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:24:54,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:24:54,667 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:24:54,667 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:24:54,885 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-20 20:24:54,887 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2022-11-20 20:24:55,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:24:55,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:00,818 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:25:00,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412697347] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:00,818 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:25:00,819 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 6, 6] total 22 [2022-11-20 20:25:00,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325728144] [2022-11-20 20:25:00,819 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:25:00,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 20:25:00,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:25:00,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 20:25:00,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=454, Unknown=2, NotChecked=0, Total=552 [2022-11-20 20:25:00,821 INFO L87 Difference]: Start difference. First operand 1271 states and 4326 transitions. Second operand has 24 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:06,934 WARN L233 SmtUtils]: Spent 5.65s on a formula simplification. DAG size of input: 43 DAG size of output: 40 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:25:08,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:25:08,560 INFO L93 Difference]: Finished difference Result 1299 states and 4392 transitions. [2022-11-20 20:25:08,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 20:25:08,561 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-20 20:25:08,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:25:08,564 INFO L225 Difference]: With dead ends: 1299 [2022-11-20 20:25:08,565 INFO L226 Difference]: Without dead ends: 1299 [2022-11-20 20:25:08,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=154, Invalid=714, Unknown=2, NotChecked=0, Total=870 [2022-11-20 20:25:08,565 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:25:08,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 38 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 210 Invalid, 0 Unknown, 93 Unchecked, 1.2s Time] [2022-11-20 20:25:08,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1299 states. [2022-11-20 20:25:08,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1299 to 1285. [2022-11-20 20:25:08,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1285 states, 1095 states have (on average 3.9808219178082194) internal successors, (4359), 1284 states have internal predecessors, (4359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:08,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1285 states to 1285 states and 4359 transitions. [2022-11-20 20:25:08,622 INFO L78 Accepts]: Start accepts. Automaton has 1285 states and 4359 transitions. Word has length 8 [2022-11-20 20:25:08,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:25:08,623 INFO L495 AbstractCegarLoop]: Abstraction has 1285 states and 4359 transitions. [2022-11-20 20:25:08,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:08,623 INFO L276 IsEmpty]: Start isEmpty. Operand 1285 states and 4359 transitions. [2022-11-20 20:25:08,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 20:25:08,624 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:25:08,624 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:25:08,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:08,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:09,041 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (18)] Ended with exit code 0 [2022-11-20 20:25:09,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:09,232 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:25:09,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:25:09,232 INFO L85 PathProgramCache]: Analyzing trace with hash 1425985205, now seen corresponding path program 1 times [2022-11-20 20:25:09,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:25:09,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2010527701] [2022-11-20 20:25:09,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:09,233 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:09,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:25:09,234 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:25:09,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2022-11-20 20:25:09,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:09,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-20 20:25:09,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:09,370 INFO L350 Elim1Store]: Elim1 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 7 [2022-11-20 20:25:09,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:25:09,401 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:25:09,401 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:25:09,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2010527701] [2022-11-20 20:25:09,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2010527701] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:25:09,402 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:25:09,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:25:09,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422006401] [2022-11-20 20:25:09,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:25:09,403 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:25:09,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:25:09,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:25:09,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:25:09,404 INFO L87 Difference]: Start difference. First operand 1285 states and 4359 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) [2022-11-20 20:25:09,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:25:09,767 INFO L93 Difference]: Finished difference Result 849 states and 2828 transitions. [2022-11-20 20:25:09,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:25:09,768 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 [2022-11-20 20:25:09,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:25:09,771 INFO L225 Difference]: With dead ends: 849 [2022-11-20 20:25:09,771 INFO L226 Difference]: Without dead ends: 849 [2022-11-20 20:25:09,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:25:09,772 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 74 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:25:09,772 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 3 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:25:09,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 849 states. [2022-11-20 20:25:09,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 849 to 849. [2022-11-20 20:25:09,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 757 states have (on average 3.7357992073976223) internal successors, (2828), 848 states have internal predecessors, (2828), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:09,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 2828 transitions. [2022-11-20 20:25:09,790 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 2828 transitions. Word has length 8 [2022-11-20 20:25:09,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:25:09,791 INFO L495 AbstractCegarLoop]: Abstraction has 849 states and 2828 transitions. [2022-11-20 20:25:09,791 INFO L496 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) [2022-11-20 20:25:09,791 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 2828 transitions. [2022-11-20 20:25:09,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 20:25:09,792 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:25:09,792 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:25:09,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:09,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:09,995 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:25:09,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:25:09,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1425985206, now seen corresponding path program 1 times [2022-11-20 20:25:09,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:25:09,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1249462505] [2022-11-20 20:25:09,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:09,997 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:09,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:25:09,999 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:25:10,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2022-11-20 20:25:10,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:10,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:25:10,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:10,276 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:10,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:10,573 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:25:10,666 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:10,666 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:25:10,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1249462505] [2022-11-20 20:25:10,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1249462505] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:10,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1224769416] [2022-11-20 20:25:10,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:10,667 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:25:10,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:25:10,668 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:25:10,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2022-11-20 20:25:10,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:10,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:25:10,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:11,041 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:25:11,347 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:11,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:11,639 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:11,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1224769416] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:11,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116523739] [2022-11-20 20:25:11,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:11,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:25:11,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:25:11,642 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:25:11,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-20 20:25:11,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:11,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:25:11,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:11,802 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:25:12,107 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:12,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:12,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:12,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116523739] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:12,633 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:25:12,633 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 20:25:12,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282965929] [2022-11-20 20:25:12,634 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:25:12,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 20:25:12,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:25:12,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 20:25:12,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:25:12,635 INFO L87 Difference]: Start difference. First operand 849 states and 2828 transitions. Second operand has 21 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:15,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:25:15,772 INFO L93 Difference]: Finished difference Result 867 states and 2865 transitions. [2022-11-20 20:25:15,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-20 20:25:15,773 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 0 states have call successors, (0), 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 [2022-11-20 20:25:15,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:25:15,775 INFO L225 Difference]: With dead ends: 867 [2022-11-20 20:25:15,775 INFO L226 Difference]: Without dead ends: 867 [2022-11-20 20:25:15,776 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=165, Invalid=705, Unknown=0, NotChecked=0, Total=870 [2022-11-20 20:25:15,777 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:25:15,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 37 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 363 Invalid, 0 Unknown, 51 Unchecked, 2.2s Time] [2022-11-20 20:25:15,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2022-11-20 20:25:15,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 849. [2022-11-20 20:25:15,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 757 states have (on average 3.7331571994715986) internal successors, (2826), 848 states have internal predecessors, (2826), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:15,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 2826 transitions. [2022-11-20 20:25:15,794 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 2826 transitions. Word has length 8 [2022-11-20 20:25:15,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:25:15,795 INFO L495 AbstractCegarLoop]: Abstraction has 849 states and 2826 transitions. [2022-11-20 20:25:15,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:15,795 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 2826 transitions. [2022-11-20 20:25:15,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:25:15,796 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:25:15,796 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:25:15,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:16,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:16,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:16,410 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:25:16,410 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:25:16,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:25:16,411 INFO L85 PathProgramCache]: Analyzing trace with hash 1256089161, now seen corresponding path program 1 times [2022-11-20 20:25:16,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:25:16,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [539077339] [2022-11-20 20:25:16,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:16,411 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:16,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:25:16,412 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:25:16,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2022-11-20 20:25:16,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:16,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-20 20:25:16,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:16,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:25:16,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:25:16,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:25:16,764 INFO L321 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2022-11-20 20:25:16,765 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 34 [2022-11-20 20:25:16,794 INFO L350 Elim1Store]: Elim1 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 18 treesize of output 16 [2022-11-20 20:25:17,030 INFO L321 Elim1Store]: treesize reduction 32, result has 25.6 percent of original size [2022-11-20 20:25:17,031 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 26 [2022-11-20 20:25:17,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:17,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:17,780 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:17,780 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:25:17,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [539077339] [2022-11-20 20:25:17,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [539077339] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:17,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [983835454] [2022-11-20 20:25:17,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:17,781 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:25:17,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:25:17,782 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:25:17,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2022-11-20 20:25:18,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:18,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 20:25:18,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:18,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:25:18,294 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 20:25:18,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 20:25:18,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:25:18,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-20 20:25:18,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:25:18,605 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:25:18,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [983835454] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:25:18,605 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:25:18,605 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3, 3] total 8 [2022-11-20 20:25:18,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814562316] [2022-11-20 20:25:18,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:25:18,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:25:18,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:25:18,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:25:18,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2022-11-20 20:25:18,607 INFO L87 Difference]: Start difference. First operand 849 states and 2826 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:18,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:25:18,958 INFO L93 Difference]: Finished difference Result 813 states and 2724 transitions. [2022-11-20 20:25:18,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:25:18,958 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:25:18,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:25:18,961 INFO L225 Difference]: With dead ends: 813 [2022-11-20 20:25:18,961 INFO L226 Difference]: Without dead ends: 813 [2022-11-20 20:25:18,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2022-11-20 20:25:18,962 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:25:18,963 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 3 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 38 Invalid, 0 Unknown, 1 Unchecked, 0.3s Time] [2022-11-20 20:25:18,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 813 states. [2022-11-20 20:25:18,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 813 to 813. [2022-11-20 20:25:18,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 813 states, 733 states have (on average 3.7162346521145975) internal successors, (2724), 812 states have internal predecessors, (2724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:18,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 813 states to 813 states and 2724 transitions. [2022-11-20 20:25:18,988 INFO L78 Accepts]: Start accepts. Automaton has 813 states and 2724 transitions. Word has length 9 [2022-11-20 20:25:18,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:25:18,988 INFO L495 AbstractCegarLoop]: Abstraction has 813 states and 2724 transitions. [2022-11-20 20:25:18,988 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:18,988 INFO L276 IsEmpty]: Start isEmpty. Operand 813 states and 2724 transitions. [2022-11-20 20:25:18,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:25:18,989 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:25:18,989 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:25:19,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:19,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:19,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:25:19,399 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:25:19,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:25:19,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1256089163, now seen corresponding path program 1 times [2022-11-20 20:25:19,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:25:19,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1240382319] [2022-11-20 20:25:19,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:19,400 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:19,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:25:19,401 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:25:19,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2022-11-20 20:25:19,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:19,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:25:19,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:19,689 INFO L321 Elim1Store]: treesize reduction 105, result has 17.3 percent of original size [2022-11-20 20:25:19,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 44 [2022-11-20 20:25:19,740 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-20 20:25:19,740 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2022-11-20 20:25:19,766 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:25:19,767 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:25:19,767 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:25:19,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1240382319] [2022-11-20 20:25:19,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1240382319] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:25:19,767 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:25:19,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 20:25:19,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651292733] [2022-11-20 20:25:19,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:25:19,768 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:25:19,768 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:25:19,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:25:19,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:25:19,769 INFO L87 Difference]: Start difference. First operand 813 states and 2724 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:20,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:25:20,084 INFO L93 Difference]: Finished difference Result 777 states and 2622 transitions. [2022-11-20 20:25:20,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:25:20,084 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:25:20,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:25:20,088 INFO L225 Difference]: With dead ends: 777 [2022-11-20 20:25:20,088 INFO L226 Difference]: Without dead ends: 777 [2022-11-20 20:25:20,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:25:20,089 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 31 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:25:20,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 3 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:25:20,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 777 states. [2022-11-20 20:25:20,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 777 to 777. [2022-11-20 20:25:20,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 777 states, 709 states have (on average 3.698166431593794) internal successors, (2622), 776 states have internal predecessors, (2622), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:20,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 777 states to 777 states and 2622 transitions. [2022-11-20 20:25:20,112 INFO L78 Accepts]: Start accepts. Automaton has 777 states and 2622 transitions. Word has length 9 [2022-11-20 20:25:20,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:25:20,112 INFO L495 AbstractCegarLoop]: Abstraction has 777 states and 2622 transitions. [2022-11-20 20:25:20,112 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:20,112 INFO L276 IsEmpty]: Start isEmpty. Operand 777 states and 2622 transitions. [2022-11-20 20:25:20,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:25:20,120 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:25:20,121 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:25:20,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:20,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:20,335 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:25:20,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:25:20,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1256087516, now seen corresponding path program 1 times [2022-11-20 20:25:20,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:25:20,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1513923164] [2022-11-20 20:25:20,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:20,336 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:20,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:25:20,337 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:25:20,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2022-11-20 20:25:20,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:20,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:25:20,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:20,780 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:25:20,781 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:25:20,971 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:25:20,971 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:25:21,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:25:21,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:25:21,160 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:25:21,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:25:21,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:21,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:26,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:26,057 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:25:26,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1513923164] [2022-11-20 20:25:26,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1513923164] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:26,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [188362462] [2022-11-20 20:25:26,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:26,058 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:25:26,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:25:26,059 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:25:26,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2022-11-20 20:25:26,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:26,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:25:26,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:26,606 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:25:26,607 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:25:26,810 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:25:26,810 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:25:27,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:25:27,047 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:25:27,069 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:25:27,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:25:27,459 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:27,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:28,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:28,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [188362462] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:28,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569867817] [2022-11-20 20:25:28,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:28,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:25:28,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:25:28,317 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:25:28,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-20 20:25:28,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:28,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:25:28,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:28,661 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:25:28,662 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:25:28,875 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-20 20:25:28,875 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2022-11-20 20:25:29,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:25:29,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:36,983 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:25:36,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569867817] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:36,984 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:25:36,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 6, 6] total 22 [2022-11-20 20:25:36,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149472003] [2022-11-20 20:25:36,984 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:25:36,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 20:25:36,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:25:36,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 20:25:36,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=453, Unknown=3, NotChecked=0, Total=552 [2022-11-20 20:25:36,986 INFO L87 Difference]: Start difference. First operand 777 states and 2622 transitions. Second operand has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:49,080 WARN L233 SmtUtils]: Spent 11.64s on a formula simplification. DAG size of input: 43 DAG size of output: 40 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:25:50,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:25:50,440 INFO L93 Difference]: Finished difference Result 799 states and 2677 transitions. [2022-11-20 20:25:50,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 20:25:50,441 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:25:50,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:25:50,443 INFO L225 Difference]: With dead ends: 799 [2022-11-20 20:25:50,443 INFO L226 Difference]: Without dead ends: 799 [2022-11-20 20:25:50,444 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=154, Invalid=713, Unknown=3, NotChecked=0, Total=870 [2022-11-20 20:25:50,444 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 205 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:25:50,445 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 37 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 167 Invalid, 0 Unknown, 205 Unchecked, 1.0s Time] [2022-11-20 20:25:50,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2022-11-20 20:25:50,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 779. [2022-11-20 20:25:50,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 779 states, 711 states have (on average 3.6962025316455698) internal successors, (2628), 778 states have internal predecessors, (2628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:50,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 779 states to 779 states and 2628 transitions. [2022-11-20 20:25:50,466 INFO L78 Accepts]: Start accepts. Automaton has 779 states and 2628 transitions. Word has length 9 [2022-11-20 20:25:50,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:25:50,467 INFO L495 AbstractCegarLoop]: Abstraction has 779 states and 2628 transitions. [2022-11-20 20:25:50,467 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 23 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:50,467 INFO L276 IsEmpty]: Start isEmpty. Operand 779 states and 2628 transitions. [2022-11-20 20:25:50,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:25:50,468 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:25:50,468 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:25:50,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:50,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:50,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:51,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:25:51,075 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:25:51,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:25:51,076 INFO L85 PathProgramCache]: Analyzing trace with hash 1256087518, now seen corresponding path program 1 times [2022-11-20 20:25:51,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:25:51,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2124246560] [2022-11-20 20:25:51,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:51,076 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:51,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:25:51,077 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:25:51,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2022-11-20 20:25:51,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:51,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:25:51,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:51,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:51,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:51,616 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:25:51,712 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:51,713 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:25:51,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2124246560] [2022-11-20 20:25:51,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2124246560] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:51,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1571568618] [2022-11-20 20:25:51,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:51,713 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:25:51,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:25:51,714 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:25:51,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2022-11-20 20:25:52,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:52,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:25:52,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:52,136 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:25:52,439 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:52,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:52,751 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:52,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1571568618] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:52,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924849299] [2022-11-20 20:25:52,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:52,752 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:25:52,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:25:52,753 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:25:52,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-20 20:25:52,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:52,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:25:52,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:52,934 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:25:53,236 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:53,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:53,756 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:53,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924849299] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:53,757 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:25:53,757 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 20:25:53,757 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703816667] [2022-11-20 20:25:53,757 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:25:53,758 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 20:25:53,758 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:25:53,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 20:25:53,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:25:53,764 INFO L87 Difference]: Start difference. First operand 779 states and 2628 transitions. Second operand has 21 states, 20 states have (on average 1.75) internal successors, (35), 21 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) [2022-11-20 20:25:57,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:25:57,322 INFO L93 Difference]: Finished difference Result 812 states and 2699 transitions. [2022-11-20 20:25:57,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-20 20:25:57,323 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.75) internal successors, (35), 21 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 9 [2022-11-20 20:25:57,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:25:57,326 INFO L225 Difference]: With dead ends: 812 [2022-11-20 20:25:57,326 INFO L226 Difference]: Without dead ends: 812 [2022-11-20 20:25:57,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=165, Invalid=705, Unknown=0, NotChecked=0, Total=870 [2022-11-20 20:25:57,327 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:25:57,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 40 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 393 Invalid, 0 Unknown, 57 Unchecked, 2.6s Time] [2022-11-20 20:25:57,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2022-11-20 20:25:57,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 780. [2022-11-20 20:25:57,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 780 states, 712 states have (on average 3.6952247191011236) internal successors, (2631), 779 states have internal predecessors, (2631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:57,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 780 states to 780 states and 2631 transitions. [2022-11-20 20:25:57,347 INFO L78 Accepts]: Start accepts. Automaton has 780 states and 2631 transitions. Word has length 9 [2022-11-20 20:25:57,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:25:57,347 INFO L495 AbstractCegarLoop]: Abstraction has 780 states and 2631 transitions. [2022-11-20 20:25:57,348 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.75) internal successors, (35), 21 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) [2022-11-20 20:25:57,348 INFO L276 IsEmpty]: Start isEmpty. Operand 780 states and 2631 transitions. [2022-11-20 20:25:57,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:25:57,348 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:25:57,349 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:25:57,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:57,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:57,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:57,955 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:25:57,955 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:25:57,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:25:57,956 INFO L85 PathProgramCache]: Analyzing trace with hash 1255872174, now seen corresponding path program 1 times [2022-11-20 20:25:57,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:25:57,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1079541460] [2022-11-20 20:25:57,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:57,957 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:25:57,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:25:57,958 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:25:57,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2022-11-20 20:25:58,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:58,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:25:58,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:58,283 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:58,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:58,454 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:58,454 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:25:58,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1079541460] [2022-11-20 20:25:58,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1079541460] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:58,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [146982899] [2022-11-20 20:25:58,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:58,455 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:25:58,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:25:58,456 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:25:58,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2022-11-20 20:25:58,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:58,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 20:25:58,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:58,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:58,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:25:58,881 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:25:58,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [146982899] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:25:58,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542263643] [2022-11-20 20:25:58,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:25:58,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:25:58,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:25:58,883 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:25:58,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-20 20:25:59,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:25:59,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-20 20:25:59,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:25:59,108 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:25:59,108 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:25:59,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1542263643] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:25:59,108 INFO L184 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2022-11-20 20:25:59,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 5, 5, 5] total 13 [2022-11-20 20:25:59,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147419113] [2022-11-20 20:25:59,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:25:59,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:25:59,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:25:59,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:25:59,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:25:59,110 INFO L87 Difference]: Start difference. First operand 780 states and 2631 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:59,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:25:59,662 INFO L93 Difference]: Finished difference Result 1145 states and 3931 transitions. [2022-11-20 20:25:59,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:25:59,663 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:25:59,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:25:59,666 INFO L225 Difference]: With dead ends: 1145 [2022-11-20 20:25:59,666 INFO L226 Difference]: Without dead ends: 1145 [2022-11-20 20:25:59,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:25:59,667 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 53 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:25:59,667 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 7 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-20 20:25:59,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1145 states. [2022-11-20 20:25:59,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1145 to 901. [2022-11-20 20:25:59,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 901 states, 833 states have (on average 3.965186074429772) internal successors, (3303), 900 states have internal predecessors, (3303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:59,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 901 states to 901 states and 3303 transitions. [2022-11-20 20:25:59,696 INFO L78 Accepts]: Start accepts. Automaton has 901 states and 3303 transitions. Word has length 9 [2022-11-20 20:25:59,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:25:59,696 INFO L495 AbstractCegarLoop]: Abstraction has 901 states and 3303 transitions. [2022-11-20 20:25:59,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:25:59,697 INFO L276 IsEmpty]: Start isEmpty. Operand 901 states and 3303 transitions. [2022-11-20 20:25:59,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:25:59,697 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:25:59,697 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:25:59,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-20 20:25:59,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:00,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:00,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:00,304 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:00,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:00,304 INFO L85 PathProgramCache]: Analyzing trace with hash 1255873197, now seen corresponding path program 1 times [2022-11-20 20:26:00,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:00,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [338270368] [2022-11-20 20:26:00,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:00,305 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:00,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:00,306 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:00,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2022-11-20 20:26:00,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:00,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:26:00,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:00,686 INFO L321 Elim1Store]: treesize reduction 93, result has 26.8 percent of original size [2022-11-20 20:26:00,686 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 52 [2022-11-20 20:26:01,003 INFO L321 Elim1Store]: treesize reduction 24, result has 57.9 percent of original size [2022-11-20 20:26:01,003 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 39 treesize of output 68 [2022-11-20 20:26:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:26:01,587 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:26:01,587 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:01,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [338270368] [2022-11-20 20:26:01,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [338270368] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:26:01,587 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:26:01,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:26:01,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131152673] [2022-11-20 20:26:01,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:26:01,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:26:01,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:01,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:26:01,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:26:01,589 INFO L87 Difference]: Start difference. First operand 901 states and 3303 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:01,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:01,791 INFO L93 Difference]: Finished difference Result 900 states and 3298 transitions. [2022-11-20 20:26:01,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 20:26:01,792 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:26:01,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:01,795 INFO L225 Difference]: With dead ends: 900 [2022-11-20 20:26:01,795 INFO L226 Difference]: Without dead ends: 900 [2022-11-20 20:26:01,795 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 0 SyntacticMatches, 5 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:26:01,796 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:01,796 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 60 Unchecked, 0.2s Time] [2022-11-20 20:26:01,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2022-11-20 20:26:01,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 900. [2022-11-20 20:26:01,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 900 states, 832 states have (on average 3.9639423076923075) internal successors, (3298), 899 states have internal predecessors, (3298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:01,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 3298 transitions. [2022-11-20 20:26:01,838 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 3298 transitions. Word has length 9 [2022-11-20 20:26:01,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:01,838 INFO L495 AbstractCegarLoop]: Abstraction has 900 states and 3298 transitions. [2022-11-20 20:26:01,838 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:01,839 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 3298 transitions. [2022-11-20 20:26:01,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:26:01,839 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:01,839 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:01,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:02,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:02,047 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:02,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:02,048 INFO L85 PathProgramCache]: Analyzing trace with hash 1255873089, now seen corresponding path program 1 times [2022-11-20 20:26:02,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:02,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2071013120] [2022-11-20 20:26:02,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:02,049 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:02,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:02,050 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:02,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2022-11-20 20:26:02,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:02,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:26:02,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:02,445 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:02,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:02,672 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:02,672 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:02,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2071013120] [2022-11-20 20:26:02,673 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2071013120] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:02,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [121564832] [2022-11-20 20:26:02,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:02,673 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:26:02,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:26:02,674 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:26:02,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2022-11-20 20:26:03,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:03,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:26:03,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:03,177 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:03,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:03,224 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:03,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [121564832] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:03,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [846086531] [2022-11-20 20:26:03,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:03,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:26:03,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:26:03,226 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:26:03,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-20 20:26:03,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:03,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:26:03,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:03,514 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:03,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:03,559 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:03,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [846086531] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:03,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:26:03,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 12 [2022-11-20 20:26:03,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732495128] [2022-11-20 20:26:03,560 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:26:03,560 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-20 20:26:03,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:03,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-20 20:26:03,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2022-11-20 20:26:03,561 INFO L87 Difference]: Start difference. First operand 900 states and 3298 transitions. Second operand has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 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) [2022-11-20 20:26:06,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:06,243 INFO L93 Difference]: Finished difference Result 1764 states and 6157 transitions. [2022-11-20 20:26:06,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-20 20:26:06,244 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 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 9 [2022-11-20 20:26:06,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:06,251 INFO L225 Difference]: With dead ends: 1764 [2022-11-20 20:26:06,252 INFO L226 Difference]: Without dead ends: 1764 [2022-11-20 20:26:06,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=94, Invalid=248, Unknown=0, NotChecked=0, Total=342 [2022-11-20 20:26:06,252 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 279 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:06,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 46 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-20 20:26:06,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1764 states. [2022-11-20 20:26:06,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1764 to 1275. [2022-11-20 20:26:06,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1275 states, 1207 states have (on average 4.029826014913008) internal successors, (4864), 1274 states have internal predecessors, (4864), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:06,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1275 states to 1275 states and 4864 transitions. [2022-11-20 20:26:06,302 INFO L78 Accepts]: Start accepts. Automaton has 1275 states and 4864 transitions. Word has length 9 [2022-11-20 20:26:06,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:06,302 INFO L495 AbstractCegarLoop]: Abstraction has 1275 states and 4864 transitions. [2022-11-20 20:26:06,302 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 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) [2022-11-20 20:26:06,303 INFO L276 IsEmpty]: Start isEmpty. Operand 1275 states and 4864 transitions. [2022-11-20 20:26:06,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:26:06,303 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:06,303 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:06,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:06,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:06,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:06,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:26:06,908 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:06,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:06,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1255872686, now seen corresponding path program 2 times [2022-11-20 20:26:06,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:06,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1485917205] [2022-11-20 20:26:06,909 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:26:06,909 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:06,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:06,910 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:06,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2022-11-20 20:26:07,070 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:26:07,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:26:07,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:26:07,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:07,292 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:26:07,293 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:26:07,485 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:26:07,486 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:26:07,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:26:07,586 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:26:07,601 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:26:07,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:26:07,788 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:26:07,788 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:26:07,788 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:07,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1485917205] [2022-11-20 20:26:07,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1485917205] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:26:07,788 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:26:07,789 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:26:07,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26271846] [2022-11-20 20:26:07,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:26:07,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:26:07,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:07,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:26:07,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:26:07,790 INFO L87 Difference]: Start difference. First operand 1275 states and 4864 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:08,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:08,260 INFO L93 Difference]: Finished difference Result 1275 states and 4860 transitions. [2022-11-20 20:26:08,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:26:08,261 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:26:08,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:08,266 INFO L225 Difference]: With dead ends: 1275 [2022-11-20 20:26:08,267 INFO L226 Difference]: Without dead ends: 1275 [2022-11-20 20:26:08,267 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:26:08,268 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:08,269 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 12 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 85 Invalid, 0 Unknown, 37 Unchecked, 0.4s Time] [2022-11-20 20:26:08,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1275 states. [2022-11-20 20:26:08,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1275 to 1273. [2022-11-20 20:26:08,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1273 states, 1205 states have (on average 4.029875518672199) internal successors, (4856), 1272 states have internal predecessors, (4856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:08,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1273 states to 1273 states and 4856 transitions. [2022-11-20 20:26:08,306 INFO L78 Accepts]: Start accepts. Automaton has 1273 states and 4856 transitions. Word has length 9 [2022-11-20 20:26:08,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:08,307 INFO L495 AbstractCegarLoop]: Abstraction has 1273 states and 4856 transitions. [2022-11-20 20:26:08,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:08,307 INFO L276 IsEmpty]: Start isEmpty. Operand 1273 states and 4856 transitions. [2022-11-20 20:26:08,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:26:08,308 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:08,308 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:08,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:08,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:08,517 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:08,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:08,517 INFO L85 PathProgramCache]: Analyzing trace with hash 1255872688, now seen corresponding path program 2 times [2022-11-20 20:26:08,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:08,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [414615594] [2022-11-20 20:26:08,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:26:08,517 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:08,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:08,518 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:08,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2022-11-20 20:26:08,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:26:08,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:26:08,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:26:08,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:08,707 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:26:08,907 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:26:08,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:26:08,907 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:08,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [414615594] [2022-11-20 20:26:08,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [414615594] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:26:08,907 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:26:08,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:26:08,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723383274] [2022-11-20 20:26:08,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:26:08,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:26:08,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:08,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:26:08,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:26:08,909 INFO L87 Difference]: Start difference. First operand 1273 states and 4856 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:09,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:09,243 INFO L93 Difference]: Finished difference Result 1633 states and 6270 transitions. [2022-11-20 20:26:09,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:26:09,244 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:26:09,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:09,250 INFO L225 Difference]: With dead ends: 1633 [2022-11-20 20:26:09,251 INFO L226 Difference]: Without dead ends: 1633 [2022-11-20 20:26:09,251 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:26:09,252 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 28 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:09,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 15 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 59 Invalid, 0 Unknown, 101 Unchecked, 0.3s Time] [2022-11-20 20:26:09,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1633 states. [2022-11-20 20:26:09,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1633 to 1513. [2022-11-20 20:26:09,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1513 states, 1445 states have (on average 4.12318339100346) internal successors, (5958), 1512 states have internal predecessors, (5958), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:09,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1513 states to 1513 states and 5958 transitions. [2022-11-20 20:26:09,296 INFO L78 Accepts]: Start accepts. Automaton has 1513 states and 5958 transitions. Word has length 9 [2022-11-20 20:26:09,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:09,296 INFO L495 AbstractCegarLoop]: Abstraction has 1513 states and 5958 transitions. [2022-11-20 20:26:09,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:09,297 INFO L276 IsEmpty]: Start isEmpty. Operand 1513 states and 5958 transitions. [2022-11-20 20:26:09,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:26:09,297 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:09,297 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:09,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:09,499 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:09,499 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:09,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:09,500 INFO L85 PathProgramCache]: Analyzing trace with hash 284053002, now seen corresponding path program 1 times [2022-11-20 20:26:09,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:09,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1290993239] [2022-11-20 20:26:09,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:09,500 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:09,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:09,501 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:09,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2022-11-20 20:26:09,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:09,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:26:09,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:09,887 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:09,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:10,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:10,164 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:10,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1290993239] [2022-11-20 20:26:10,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1290993239] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:10,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [14233655] [2022-11-20 20:26:10,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:10,164 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:26:10,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:26:10,165 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:26:10,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2022-11-20 20:26:10,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:10,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:26:10,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:10,643 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:10,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:10,727 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:10,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [14233655] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:10,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902561116] [2022-11-20 20:26:10,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:10,728 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:26:10,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:26:10,729 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:26:10,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-20 20:26:10,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:10,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:26:10,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:11,009 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:11,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:11,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:11,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902561116] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:11,089 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:26:11,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 12 [2022-11-20 20:26:11,089 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356048515] [2022-11-20 20:26:11,089 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:26:11,090 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-20 20:26:11,090 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:11,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-20 20:26:11,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-11-20 20:26:11,090 INFO L87 Difference]: Start difference. First operand 1513 states and 5958 transitions. Second operand has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:12,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:12,461 INFO L93 Difference]: Finished difference Result 2012 states and 7518 transitions. [2022-11-20 20:26:12,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-20 20:26:12,462 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 20:26:12,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:12,468 INFO L225 Difference]: With dead ends: 2012 [2022-11-20 20:26:12,468 INFO L226 Difference]: Without dead ends: 2012 [2022-11-20 20:26:12,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2022-11-20 20:26:12,469 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 171 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:12,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 28 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 293 Invalid, 0 Unknown, 112 Unchecked, 1.2s Time] [2022-11-20 20:26:12,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2012 states. [2022-11-20 20:26:12,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2012 to 1839. [2022-11-20 20:26:12,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1839 states, 1771 states have (on average 4.004517221908526) internal successors, (7092), 1838 states have internal predecessors, (7092), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:12,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1839 states to 1839 states and 7092 transitions. [2022-11-20 20:26:12,509 INFO L78 Accepts]: Start accepts. Automaton has 1839 states and 7092 transitions. Word has length 10 [2022-11-20 20:26:12,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:12,509 INFO L495 AbstractCegarLoop]: Abstraction has 1839 states and 7092 transitions. [2022-11-20 20:26:12,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:12,509 INFO L276 IsEmpty]: Start isEmpty. Operand 1839 states and 7092 transitions. [2022-11-20 20:26:12,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:26:12,510 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:12,510 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:12,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:12,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:12,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:13,112 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:26:13,112 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:13,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:13,113 INFO L85 PathProgramCache]: Analyzing trace with hash 284052543, now seen corresponding path program 1 times [2022-11-20 20:26:13,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:13,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1020405880] [2022-11-20 20:26:13,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:13,113 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:13,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:13,114 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:13,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2022-11-20 20:26:13,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:13,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:26:13,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:13,582 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:26:13,583 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:26:13,774 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:26:13,775 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:26:13,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:26:13,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:26:13,974 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:26:13,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:26:14,162 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:14,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:14,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:14,941 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:14,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1020405880] [2022-11-20 20:26:14,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1020405880] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:14,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [530954262] [2022-11-20 20:26:14,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:14,942 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:26:14,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:26:14,947 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:26:14,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2022-11-20 20:26:15,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:15,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:26:15,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:15,577 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:26:15,577 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:26:15,781 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:26:15,781 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:26:16,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:26:16,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:26:16,050 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:26:16,051 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:26:16,475 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:16,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:18,031 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:18,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [530954262] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:18,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224644178] [2022-11-20 20:26:18,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:18,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:26:18,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:26:18,033 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:26:18,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-20 20:26:18,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:18,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:26:18,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:18,411 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:26:18,411 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:26:18,645 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-20 20:26:18,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2022-11-20 20:26:19,187 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:26:19,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:20,827 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:26:20,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224644178] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:20,828 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:26:20,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 6, 6] total 22 [2022-11-20 20:26:20,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404821081] [2022-11-20 20:26:20,829 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:26:20,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 20:26:20,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:20,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 20:26:20,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2022-11-20 20:26:20,830 INFO L87 Difference]: Start difference. First operand 1839 states and 7092 transitions. Second operand has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:32,683 WARN L233 SmtUtils]: Spent 11.39s on a formula simplification. DAG size of input: 43 DAG size of output: 40 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:26:34,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:34,255 INFO L93 Difference]: Finished difference Result 1886 states and 7276 transitions. [2022-11-20 20:26:34,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 20:26:34,256 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 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 [2022-11-20 20:26:34,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:34,263 INFO L225 Difference]: With dead ends: 1886 [2022-11-20 20:26:34,263 INFO L226 Difference]: Without dead ends: 1886 [2022-11-20 20:26:34,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=154, Invalid=716, Unknown=0, NotChecked=0, Total=870 [2022-11-20 20:26:34,264 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 21 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 298 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:34,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 54 Invalid, 468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 165 Invalid, 0 Unknown, 298 Unchecked, 1.2s Time] [2022-11-20 20:26:34,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1886 states. [2022-11-20 20:26:34,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1886 to 1861. [2022-11-20 20:26:34,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1861 states, 1793 states have (on average 4.00111544896821) internal successors, (7174), 1860 states have internal predecessors, (7174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:34,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1861 states to 1861 states and 7174 transitions. [2022-11-20 20:26:34,313 INFO L78 Accepts]: Start accepts. Automaton has 1861 states and 7174 transitions. Word has length 10 [2022-11-20 20:26:34,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:34,313 INFO L495 AbstractCegarLoop]: Abstraction has 1861 states and 7174 transitions. [2022-11-20 20:26:34,313 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:34,313 INFO L276 IsEmpty]: Start isEmpty. Operand 1861 states and 7174 transitions. [2022-11-20 20:26:34,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:26:34,314 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:34,314 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:34,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:34,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:34,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (47)] Ended with exit code 0 [2022-11-20 20:26:34,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:26:34,915 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:34,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:34,916 INFO L85 PathProgramCache]: Analyzing trace with hash 284052545, now seen corresponding path program 1 times [2022-11-20 20:26:34,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:34,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1055742057] [2022-11-20 20:26:34,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:34,917 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:34,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:34,918 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:34,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2022-11-20 20:26:35,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:35,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:26:35,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:35,251 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:35,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:35,543 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:26:35,635 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:35,635 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:35,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1055742057] [2022-11-20 20:26:35,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1055742057] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:35,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1728063057] [2022-11-20 20:26:35,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:35,636 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:26:35,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:26:35,637 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:26:35,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2022-11-20 20:26:36,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:36,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:26:36,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:36,134 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:26:36,466 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:36,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:36,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:36,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1728063057] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:36,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338083500] [2022-11-20 20:26:36,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:36,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:26:36,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:26:36,795 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:26:36,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-20 20:26:37,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:37,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:26:37,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:37,022 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:26:37,373 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:37,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:37,922 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:26:37,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338083500] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:37,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:26:37,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 20:26:37,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185197455] [2022-11-20 20:26:37,923 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:26:37,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 20:26:37,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:37,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 20:26:37,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:26:37,925 INFO L87 Difference]: Start difference. First operand 1861 states and 7174 transitions. Second operand has 21 states, 20 states have (on average 1.9) internal successors, (38), 21 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) [2022-11-20 20:26:40,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:40,779 INFO L93 Difference]: Finished difference Result 1898 states and 7340 transitions. [2022-11-20 20:26:40,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-20 20:26:40,780 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 21 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 10 [2022-11-20 20:26:40,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:40,786 INFO L225 Difference]: With dead ends: 1898 [2022-11-20 20:26:40,786 INFO L226 Difference]: Without dead ends: 1898 [2022-11-20 20:26:40,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2022-11-20 20:26:40,787 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 24 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:40,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 44 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 236 Invalid, 0 Unknown, 45 Unchecked, 1.6s Time] [2022-11-20 20:26:40,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1898 states. [2022-11-20 20:26:40,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1898 to 1871. [2022-11-20 20:26:40,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1871 states, 1803 states have (on average 4.008874098724348) internal successors, (7228), 1870 states have internal predecessors, (7228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:40,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1871 states to 1871 states and 7228 transitions. [2022-11-20 20:26:40,845 INFO L78 Accepts]: Start accepts. Automaton has 1871 states and 7228 transitions. Word has length 10 [2022-11-20 20:26:40,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:40,845 INFO L495 AbstractCegarLoop]: Abstraction has 1871 states and 7228 transitions. [2022-11-20 20:26:40,845 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 21 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) [2022-11-20 20:26:40,846 INFO L276 IsEmpty]: Start isEmpty. Operand 1871 states and 7228 transitions. [2022-11-20 20:26:40,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:26:40,846 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:40,846 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:40,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:41,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (50)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:41,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:41,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:26:41,460 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:41,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:41,460 INFO L85 PathProgramCache]: Analyzing trace with hash 284006043, now seen corresponding path program 2 times [2022-11-20 20:26:41,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:41,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1763586484] [2022-11-20 20:26:41,461 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:26:41,461 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:41,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:41,462 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:41,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2022-11-20 20:26:41,655 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:26:41,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:26:41,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:26:41,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:41,869 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:26:41,869 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:26:42,079 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:26:42,080 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:26:42,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:26:42,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:26:42,217 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:26:42,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:26:42,428 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:26:42,428 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:26:42,428 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:42,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1763586484] [2022-11-20 20:26:42,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1763586484] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:26:42,429 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:26:42,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:26:42,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064693118] [2022-11-20 20:26:42,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:26:42,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:26:42,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:42,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:26:42,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:26:42,431 INFO L87 Difference]: Start difference. First operand 1871 states and 7228 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 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) [2022-11-20 20:26:42,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:42,924 INFO L93 Difference]: Finished difference Result 1873 states and 7236 transitions. [2022-11-20 20:26:42,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:26:42,925 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 20:26:42,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:42,931 INFO L225 Difference]: With dead ends: 1873 [2022-11-20 20:26:42,931 INFO L226 Difference]: Without dead ends: 1873 [2022-11-20 20:26:42,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:26:42,932 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 9 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:42,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 82 Invalid, 0 Unknown, 41 Unchecked, 0.4s Time] [2022-11-20 20:26:42,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1873 states. [2022-11-20 20:26:42,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1873 to 1871. [2022-11-20 20:26:42,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1871 states, 1803 states have (on average 4.011092623405435) internal successors, (7232), 1870 states have internal predecessors, (7232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:42,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1871 states to 1871 states and 7232 transitions. [2022-11-20 20:26:42,990 INFO L78 Accepts]: Start accepts. Automaton has 1871 states and 7232 transitions. Word has length 10 [2022-11-20 20:26:42,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:42,991 INFO L495 AbstractCegarLoop]: Abstraction has 1871 states and 7232 transitions. [2022-11-20 20:26:42,991 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 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) [2022-11-20 20:26:42,991 INFO L276 IsEmpty]: Start isEmpty. Operand 1871 states and 7232 transitions. [2022-11-20 20:26:42,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:26:42,992 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:42,992 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:43,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:43,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:43,206 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:43,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:43,207 INFO L85 PathProgramCache]: Analyzing trace with hash 284006045, now seen corresponding path program 2 times [2022-11-20 20:26:43,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:43,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1730300457] [2022-11-20 20:26:43,207 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:26:43,207 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:43,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:43,208 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:43,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2022-11-20 20:26:43,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:26:43,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:26:43,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:26:43,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:43,410 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:26:43,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:26:43,628 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:26:43,629 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:43,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1730300457] [2022-11-20 20:26:43,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1730300457] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:26:43,629 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:26:43,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:26:43,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375673549] [2022-11-20 20:26:43,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:26:43,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:26:43,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:43,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:26:43,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:26:43,630 INFO L87 Difference]: Start difference. First operand 1871 states and 7232 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 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) [2022-11-20 20:26:44,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:44,122 INFO L93 Difference]: Finished difference Result 1869 states and 7222 transitions. [2022-11-20 20:26:44,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:26:44,122 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 20:26:44,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:44,128 INFO L225 Difference]: With dead ends: 1869 [2022-11-20 20:26:44,128 INFO L226 Difference]: Without dead ends: 1869 [2022-11-20 20:26:44,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:26:44,129 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 8 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:44,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 16 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 82 Invalid, 0 Unknown, 52 Unchecked, 0.4s Time] [2022-11-20 20:26:44,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1869 states. [2022-11-20 20:26:44,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1869 to 1867. [2022-11-20 20:26:44,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1867 states, 1799 states have (on average 4.011117287381879) internal successors, (7216), 1866 states have internal predecessors, (7216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:44,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1867 states to 1867 states and 7216 transitions. [2022-11-20 20:26:44,178 INFO L78 Accepts]: Start accepts. Automaton has 1867 states and 7216 transitions. Word has length 10 [2022-11-20 20:26:44,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:44,178 INFO L495 AbstractCegarLoop]: Abstraction has 1867 states and 7216 transitions. [2022-11-20 20:26:44,179 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 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) [2022-11-20 20:26:44,179 INFO L276 IsEmpty]: Start isEmpty. Operand 1867 states and 7216 transitions. [2022-11-20 20:26:44,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:26:44,179 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:44,180 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:44,194 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (53)] Ended with exit code 0 [2022-11-20 20:26:44,394 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:44,394 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:44,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:44,395 INFO L85 PathProgramCache]: Analyzing trace with hash 277363905, now seen corresponding path program 1 times [2022-11-20 20:26:44,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:44,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [173656568] [2022-11-20 20:26:44,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:44,395 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:44,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:44,396 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:44,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2022-11-20 20:26:44,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:44,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 20:26:44,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:44,808 INFO L321 Elim1Store]: treesize reduction 93, result has 26.8 percent of original size [2022-11-20 20:26:44,808 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 52 [2022-11-20 20:26:45,126 INFO L321 Elim1Store]: treesize reduction 24, result has 57.9 percent of original size [2022-11-20 20:26:45,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 39 treesize of output 68 [2022-11-20 20:26:45,629 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:26:45,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:26:45,629 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:45,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [173656568] [2022-11-20 20:26:45,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [173656568] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:26:45,630 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:26:45,630 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:26:45,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84596000] [2022-11-20 20:26:45,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:26:45,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:26:45,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:45,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:26:45,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:26:45,631 INFO L87 Difference]: Start difference. First operand 1867 states and 7216 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:45,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:45,857 INFO L93 Difference]: Finished difference Result 1866 states and 7214 transitions. [2022-11-20 20:26:45,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 20:26:45,858 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 20:26:45,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:45,866 INFO L225 Difference]: With dead ends: 1866 [2022-11-20 20:26:45,866 INFO L226 Difference]: Without dead ends: 1866 [2022-11-20 20:26:45,867 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:26:45,867 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:45,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 37 Unchecked, 0.2s Time] [2022-11-20 20:26:45,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1866 states. [2022-11-20 20:26:45,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1866 to 1866. [2022-11-20 20:26:45,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1866 states, 1799 states have (on average 4.010005558643691) internal successors, (7214), 1865 states have internal predecessors, (7214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:45,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1866 states to 1866 states and 7214 transitions. [2022-11-20 20:26:45,929 INFO L78 Accepts]: Start accepts. Automaton has 1866 states and 7214 transitions. Word has length 10 [2022-11-20 20:26:45,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:45,930 INFO L495 AbstractCegarLoop]: Abstraction has 1866 states and 7214 transitions. [2022-11-20 20:26:45,930 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:45,930 INFO L276 IsEmpty]: Start isEmpty. Operand 1866 states and 7214 transitions. [2022-11-20 20:26:45,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:26:45,931 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:45,931 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:45,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:46,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:46,147 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:46,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:46,148 INFO L85 PathProgramCache]: Analyzing trace with hash 277346313, now seen corresponding path program 3 times [2022-11-20 20:26:46,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:46,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1931568704] [2022-11-20 20:26:46,148 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:26:46,148 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:46,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:46,149 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:46,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2022-11-20 20:26:46,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-20 20:26:46,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:26:46,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:26:46,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:46,540 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:26:46,540 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:26:46,739 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:26:46,740 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:26:46,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:26:46,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:26:46,868 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:26:46,868 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:26:47,099 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:26:47,099 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:26:47,099 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:47,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1931568704] [2022-11-20 20:26:47,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1931568704] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:26:47,099 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:26:47,100 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:26:47,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647163413] [2022-11-20 20:26:47,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:26:47,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:26:47,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:47,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:26:47,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:26:47,102 INFO L87 Difference]: Start difference. First operand 1866 states and 7214 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 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) [2022-11-20 20:26:47,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:47,596 INFO L93 Difference]: Finished difference Result 1866 states and 7218 transitions. [2022-11-20 20:26:47,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:26:47,597 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 20:26:47,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:47,603 INFO L225 Difference]: With dead ends: 1866 [2022-11-20 20:26:47,603 INFO L226 Difference]: Without dead ends: 1866 [2022-11-20 20:26:47,604 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:26:47,604 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 9 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:47,605 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 88 Invalid, 0 Unknown, 42 Unchecked, 0.4s Time] [2022-11-20 20:26:47,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1866 states. [2022-11-20 20:26:47,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1866 to 1866. [2022-11-20 20:26:47,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1866 states, 1799 states have (on average 4.012229016120067) internal successors, (7218), 1865 states have internal predecessors, (7218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:47,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1866 states to 1866 states and 7218 transitions. [2022-11-20 20:26:47,642 INFO L78 Accepts]: Start accepts. Automaton has 1866 states and 7218 transitions. Word has length 10 [2022-11-20 20:26:47,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:47,643 INFO L495 AbstractCegarLoop]: Abstraction has 1866 states and 7218 transitions. [2022-11-20 20:26:47,643 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 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) [2022-11-20 20:26:47,643 INFO L276 IsEmpty]: Start isEmpty. Operand 1866 states and 7218 transitions. [2022-11-20 20:26:47,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:26:47,643 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:47,643 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:47,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (55)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:47,844 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:47,844 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:47,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:47,844 INFO L85 PathProgramCache]: Analyzing trace with hash 1917299444, now seen corresponding path program 2 times [2022-11-20 20:26:47,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:47,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [917913846] [2022-11-20 20:26:47,845 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:26:47,845 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:47,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:47,846 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:47,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2022-11-20 20:26:48,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:26:48,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:26:48,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:26:48,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:48,234 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:26:48,234 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:26:48,428 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:26:48,429 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:26:48,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:26:48,549 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:26:48,565 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:26:48,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:26:48,770 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:26:48,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:26:48,771 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:48,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [917913846] [2022-11-20 20:26:48,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [917913846] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:26:48,771 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:26:48,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:26:48,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448657160] [2022-11-20 20:26:48,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:26:48,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:26:48,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:48,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:26:48,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:26:48,773 INFO L87 Difference]: Start difference. First operand 1866 states and 7218 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 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) [2022-11-20 20:26:49,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:26:49,179 INFO L93 Difference]: Finished difference Result 1866 states and 7206 transitions. [2022-11-20 20:26:49,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:26:49,180 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 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 11 [2022-11-20 20:26:49,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:26:49,206 INFO L225 Difference]: With dead ends: 1866 [2022-11-20 20:26:49,206 INFO L226 Difference]: Without dead ends: 1866 [2022-11-20 20:26:49,206 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:26:49,206 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 9 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:26:49,207 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 16 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 73 Invalid, 0 Unknown, 40 Unchecked, 0.3s Time] [2022-11-20 20:26:49,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1866 states. [2022-11-20 20:26:49,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1866 to 1866. [2022-11-20 20:26:49,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1866 states, 1799 states have (on average 4.005558643690939) internal successors, (7206), 1865 states have internal predecessors, (7206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:26:49,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1866 states to 1866 states and 7206 transitions. [2022-11-20 20:26:49,258 INFO L78 Accepts]: Start accepts. Automaton has 1866 states and 7206 transitions. Word has length 11 [2022-11-20 20:26:49,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:26:49,264 INFO L495 AbstractCegarLoop]: Abstraction has 1866 states and 7206 transitions. [2022-11-20 20:26:49,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 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) [2022-11-20 20:26:49,264 INFO L276 IsEmpty]: Start isEmpty. Operand 1866 states and 7206 transitions. [2022-11-20 20:26:49,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:26:49,265 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:26:49,265 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:26:49,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2022-11-20 20:26:49,481 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:49,481 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:26:49,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:26:49,482 INFO L85 PathProgramCache]: Analyzing trace with hash 1917299446, now seen corresponding path program 1 times [2022-11-20 20:26:49,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:26:49,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1514546816] [2022-11-20 20:26:49,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:49,482 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:26:49,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:26:49,484 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:26:49,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2022-11-20 20:26:49,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:49,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:26:49,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:49,832 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:26:49,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:50,116 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:26:50,221 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:26:50,221 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:26:50,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1514546816] [2022-11-20 20:26:50,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1514546816] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:50,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1621440499] [2022-11-20 20:26:50,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:50,222 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:26:50,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:26:50,223 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:26:50,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2022-11-20 20:26:50,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:50,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:26:50,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:50,958 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:26:50,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:51,511 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:26:51,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1621440499] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:51,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625694084] [2022-11-20 20:26:51,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:26:51,511 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:26:51,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:26:51,514 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:26:51,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-20 20:26:51,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:26:51,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:26:51,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:26:51,758 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:26:52,248 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:26:52,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:26:52,901 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:26:52,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625694084] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:26:52,901 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:26:52,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 6, 6, 5, 5] total 26 [2022-11-20 20:26:52,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843900802] [2022-11-20 20:26:52,901 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:26:52,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-20 20:26:52,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:26:52,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-20 20:26:52,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=558, Unknown=0, NotChecked=0, Total=650 [2022-11-20 20:26:52,903 INFO L87 Difference]: Start difference. First operand 1866 states and 7206 transitions. Second operand has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 26 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) [2022-11-20 20:27:04,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:27:04,856 INFO L93 Difference]: Finished difference Result 5919 states and 23768 transitions. [2022-11-20 20:27:04,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-20 20:27:04,857 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 26 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) Word has length 11 [2022-11-20 20:27:04,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:27:04,878 INFO L225 Difference]: With dead ends: 5919 [2022-11-20 20:27:04,878 INFO L226 Difference]: Without dead ends: 5919 [2022-11-20 20:27:04,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=466, Invalid=1886, Unknown=0, NotChecked=0, Total=2352 [2022-11-20 20:27:04,879 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 712 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 1147 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 712 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 1537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 317 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-11-20 20:27:04,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [712 Valid, 130 Invalid, 1537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1147 Invalid, 0 Unknown, 317 Unchecked, 6.7s Time] [2022-11-20 20:27:04,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5919 states. [2022-11-20 20:27:04,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5919 to 2200. [2022-11-20 20:27:04,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2200 states, 2133 states have (on average 4.113924050632911) internal successors, (8775), 2199 states have internal predecessors, (8775), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:27:04,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2200 states to 2200 states and 8775 transitions. [2022-11-20 20:27:04,996 INFO L78 Accepts]: Start accepts. Automaton has 2200 states and 8775 transitions. Word has length 11 [2022-11-20 20:27:04,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:27:04,996 INFO L495 AbstractCegarLoop]: Abstraction has 2200 states and 8775 transitions. [2022-11-20 20:27:04,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 26 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) [2022-11-20 20:27:04,996 INFO L276 IsEmpty]: Start isEmpty. Operand 2200 states and 8775 transitions. [2022-11-20 20:27:04,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:27:04,997 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:27:04,997 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:27:05,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2022-11-20 20:27:05,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2022-11-20 20:27:05,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-11-20 20:27:05,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:27:05,612 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:27:05,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:27:05,612 INFO L85 PathProgramCache]: Analyzing trace with hash 407331455, now seen corresponding path program 2 times [2022-11-20 20:27:05,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:27:05,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1385313210] [2022-11-20 20:27:05,613 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:27:05,613 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:27:05,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:27:05,614 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:27:05,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2022-11-20 20:27:05,895 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:27:05,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:27:05,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:27:05,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:27:06,111 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 20:27:06,111 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 20:27:06,301 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:27:06,302 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:27:06,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:27:06,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:27:06,465 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:27:06,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:27:06,629 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:06,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:27:09,781 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:09,782 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:27:09,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1385313210] [2022-11-20 20:27:09,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1385313210] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:27:09,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [663387467] [2022-11-20 20:27:09,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:27:09,782 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:27:09,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:27:09,783 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:27:09,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2022-11-20 20:27:10,321 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:27:10,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:27:10,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-20 20:27:10,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:27:10,533 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:27:10,533 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:27:10,743 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:27:10,743 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:27:11,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:27:11,132 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:27:11,157 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:27:11,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:27:11,696 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:11,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:27:18,132 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:18,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [663387467] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:27:18,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1433588501] [2022-11-20 20:27:18,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:27:18,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:27:18,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:27:18,134 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:27:18,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-11-20 20:27:18,433 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:27:18,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:27:18,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:27:18,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:27:18,646 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:27:18,646 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:27:18,847 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:27:18,848 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:27:19,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:27:19,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:27:19,320 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:27:19,320 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:27:19,825 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:19,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:27:25,606 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:25,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1433588501] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:27:25,606 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:27:25,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 30 [2022-11-20 20:27:25,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267776335] [2022-11-20 20:27:25,606 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:27:25,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-20 20:27:25,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:27:25,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-20 20:27:25,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-11-20 20:27:25,608 INFO L87 Difference]: Start difference. First operand 2200 states and 8775 transitions. Second operand has 32 states, 31 states have (on average 1.5483870967741935) internal successors, (48), 31 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:27:26,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:27:26,579 INFO L93 Difference]: Finished difference Result 2206 states and 8795 transitions. [2022-11-20 20:27:26,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 20:27:26,580 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.5483870967741935) internal successors, (48), 31 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:27:26,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:27:26,588 INFO L225 Difference]: With dead ends: 2206 [2022-11-20 20:27:26,588 INFO L226 Difference]: Without dead ends: 2206 [2022-11-20 20:27:26,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=189, Invalid=933, Unknown=0, NotChecked=0, Total=1122 [2022-11-20 20:27:26,589 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 3 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 214 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-20 20:27:26,589 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 46 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 116 Invalid, 0 Unknown, 214 Unchecked, 0.8s Time] [2022-11-20 20:27:26,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2206 states. [2022-11-20 20:27:26,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2206 to 2202. [2022-11-20 20:27:26,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2202 states, 2135 states have (on average 4.113817330210773) internal successors, (8783), 2201 states have internal predecessors, (8783), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:27:26,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2202 states to 2202 states and 8783 transitions. [2022-11-20 20:27:26,640 INFO L78 Accepts]: Start accepts. Automaton has 2202 states and 8783 transitions. Word has length 11 [2022-11-20 20:27:26,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:27:26,640 INFO L495 AbstractCegarLoop]: Abstraction has 2202 states and 8783 transitions. [2022-11-20 20:27:26,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.5483870967741935) internal successors, (48), 31 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:27:26,641 INFO L276 IsEmpty]: Start isEmpty. Operand 2202 states and 8783 transitions. [2022-11-20 20:27:26,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:27:26,642 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:27:26,642 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:27:26,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2022-11-20 20:27:26,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2022-11-20 20:27:27,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2022-11-20 20:27:27,248 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:27:27,248 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:27:27,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:27:27,248 INFO L85 PathProgramCache]: Analyzing trace with hash 407331457, now seen corresponding path program 1 times [2022-11-20 20:27:27,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:27:27,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [637755584] [2022-11-20 20:27:27,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:27:27,249 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:27:27,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:27:27,250 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:27:27,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2022-11-20 20:27:27,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:27:27,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:27:27,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:27:27,722 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:27,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:27:28,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 20:27:28,433 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:28,433 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:27:28,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [637755584] [2022-11-20 20:27:28,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [637755584] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:27:28,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1683742993] [2022-11-20 20:27:28,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:27:28,433 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:27:28,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:27:28,435 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:27:28,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2022-11-20 20:27:28,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:27:28,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:27:28,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:27:29,181 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:27:29,652 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:29,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:27:30,232 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:30,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1683742993] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:27:30,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672999109] [2022-11-20 20:27:30,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:27:30,233 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:27:30,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:27:30,234 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:27:30,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-11-20 20:27:30,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:27:30,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:27:30,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:27:30,591 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:27:31,118 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:31,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:27:32,065 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:32,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672999109] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:27:32,066 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:27:32,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 30 [2022-11-20 20:27:32,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221774639] [2022-11-20 20:27:32,066 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:27:32,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-20 20:27:32,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:27:32,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-20 20:27:32,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2022-11-20 20:27:32,068 INFO L87 Difference]: Start difference. First operand 2202 states and 8783 transitions. Second operand has 31 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:27:37,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:27:37,980 INFO L93 Difference]: Finished difference Result 2690 states and 10084 transitions. [2022-11-20 20:27:37,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-20 20:27:37,981 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:27:37,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:27:37,989 INFO L225 Difference]: With dead ends: 2690 [2022-11-20 20:27:37,989 INFO L226 Difference]: Without dead ends: 2690 [2022-11-20 20:27:37,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=344, Invalid=1818, Unknown=0, NotChecked=0, Total=2162 [2022-11-20 20:27:37,991 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 346 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:27:37,991 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [346 Valid, 62 Invalid, 748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 672 Invalid, 0 Unknown, 21 Unchecked, 3.6s Time] [2022-11-20 20:27:37,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2690 states. [2022-11-20 20:27:38,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2690 to 2202. [2022-11-20 20:27:38,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2202 states, 2135 states have (on average 4.11288056206089) internal successors, (8781), 2201 states have internal predecessors, (8781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:27:38,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2202 states to 2202 states and 8781 transitions. [2022-11-20 20:27:38,072 INFO L78 Accepts]: Start accepts. Automaton has 2202 states and 8781 transitions. Word has length 11 [2022-11-20 20:27:38,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:27:38,072 INFO L495 AbstractCegarLoop]: Abstraction has 2202 states and 8781 transitions. [2022-11-20 20:27:38,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:27:38,073 INFO L276 IsEmpty]: Start isEmpty. Operand 2202 states and 8781 transitions. [2022-11-20 20:27:38,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:27:38,073 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:27:38,073 INFO L195 NwaCegarLoop]: trace histogram [6, 2, 1, 1, 1] [2022-11-20 20:27:38,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2022-11-20 20:27:38,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2022-11-20 20:27:38,481 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2022-11-20 20:27:38,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:27:38,674 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:27:38,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:27:38,675 INFO L85 PathProgramCache]: Analyzing trace with hash 357222176, now seen corresponding path program 1 times [2022-11-20 20:27:38,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:27:38,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [764587136] [2022-11-20 20:27:38,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:27:38,675 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:27:38,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:27:38,676 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:27:38,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2022-11-20 20:27:38,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:27:38,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:27:38,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:27:39,041 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:27:39,299 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:27:39,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:27:41,238 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:27:41,239 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:27:41,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [764587136] [2022-11-20 20:27:41,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [764587136] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:27:41,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [459999608] [2022-11-20 20:27:41,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:27:41,239 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:27:41,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:27:41,240 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:27:41,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2022-11-20 20:27:41,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:27:41,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:27:41,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:27:42,356 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:27:42,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:27:43,423 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:27:43,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [459999608] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:27:43,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947853654] [2022-11-20 20:27:43,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:27:43,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:27:43,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:27:43,425 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:27:43,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-11-20 20:27:43,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:27:43,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:27:43,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:27:44,073 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:27:44,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:27:44,155 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:27:44,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947853654] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:27:44,156 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:27:44,156 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 7, 7, 7, 7] total 32 [2022-11-20 20:27:44,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055803025] [2022-11-20 20:27:44,156 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:27:44,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-20 20:27:44,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:27:44,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-20 20:27:44,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=924, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 20:27:44,158 INFO L87 Difference]: Start difference. First operand 2202 states and 8781 transitions. Second operand has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 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) [2022-11-20 20:28:11,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:28:11,616 INFO L93 Difference]: Finished difference Result 11798 states and 47139 transitions. [2022-11-20 20:28:11,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-20 20:28:11,618 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 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 11 [2022-11-20 20:28:11,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:28:11,663 INFO L225 Difference]: With dead ends: 11798 [2022-11-20 20:28:11,664 INFO L226 Difference]: Without dead ends: 11798 [2022-11-20 20:28:11,664 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=360, Invalid=2190, Unknown=0, NotChecked=0, Total=2550 [2022-11-20 20:28:11,665 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 1311 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 3394 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1311 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 3455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 3394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 5 IncrementalHoareTripleChecker+Unchecked, 21.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:28:11,665 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1311 Valid, 306 Invalid, 3455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 3394 Invalid, 0 Unknown, 5 Unchecked, 21.6s Time] [2022-11-20 20:28:11,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11798 states. [2022-11-20 20:28:11,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11798 to 2194. [2022-11-20 20:28:11,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2194 states, 2127 states have (on average 4.1151857075693465) internal successors, (8753), 2193 states have internal predecessors, (8753), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:11,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2194 states to 2194 states and 8753 transitions. [2022-11-20 20:28:11,839 INFO L78 Accepts]: Start accepts. Automaton has 2194 states and 8753 transitions. Word has length 11 [2022-11-20 20:28:11,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:28:11,839 INFO L495 AbstractCegarLoop]: Abstraction has 2194 states and 8753 transitions. [2022-11-20 20:28:11,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 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) [2022-11-20 20:28:11,839 INFO L276 IsEmpty]: Start isEmpty. Operand 2194 states and 8753 transitions. [2022-11-20 20:28:11,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:28:11,840 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:28:11,840 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:28:11,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (66)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:12,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:12,244 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (67)] Ended with exit code 0 [2022-11-20 20:28:12,440 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:28:12,441 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:28:12,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:28:12,441 INFO L85 PathProgramCache]: Analyzing trace with hash 215903783, now seen corresponding path program 1 times [2022-11-20 20:28:12,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:28:12,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1986557738] [2022-11-20 20:28:12,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:28:12,442 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:12,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:28:12,443 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:28:12,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2022-11-20 20:28:12,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:28:12,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:28:12,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:12,958 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:28:12,959 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:28:13,163 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:28:13,163 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:28:13,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:28:13,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:28:13,341 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:28:13,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:28:13,535 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:13,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:28:14,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:14,309 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:28:14,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1986557738] [2022-11-20 20:28:14,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1986557738] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:28:14,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1286047671] [2022-11-20 20:28:14,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:28:14,310 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:28:14,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:28:14,311 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:28:14,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2022-11-20 20:28:14,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:28:14,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:28:14,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:15,053 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:28:15,054 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:28:15,271 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:28:15,272 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:28:15,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:28:15,566 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:28:15,586 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:28:15,586 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:28:15,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:15,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:28:21,065 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:21,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1286047671] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:28:21,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [124031185] [2022-11-20 20:28:21,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:28:21,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:28:21,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:28:21,067 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:28:21,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2022-11-20 20:28:21,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:28:21,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:28:21,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:21,515 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:28:21,516 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:28:21,734 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-20 20:28:21,734 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2022-11-20 20:28:22,260 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:28:22,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:28:27,854 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:28:27,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [124031185] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:28:27,854 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:28:27,854 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 6, 6] total 22 [2022-11-20 20:28:27,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360243894] [2022-11-20 20:28:27,855 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:28:27,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 20:28:27,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:28:27,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 20:28:27,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=453, Unknown=3, NotChecked=0, Total=552 [2022-11-20 20:28:27,856 INFO L87 Difference]: Start difference. First operand 2194 states and 8753 transitions. Second operand has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 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) [2022-11-20 20:28:33,507 WARN L233 SmtUtils]: Spent 5.18s on a formula simplification. DAG size of input: 43 DAG size of output: 40 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:28:34,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:28:34,868 INFO L93 Difference]: Finished difference Result 2237 states and 8933 transitions. [2022-11-20 20:28:34,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 20:28:34,869 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 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) Word has length 11 [2022-11-20 20:28:34,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:28:34,876 INFO L225 Difference]: With dead ends: 2237 [2022-11-20 20:28:34,876 INFO L226 Difference]: Without dead ends: 2237 [2022-11-20 20:28:34,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=149, Invalid=718, Unknown=3, NotChecked=0, Total=870 [2022-11-20 20:28:34,877 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 24 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 236 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:28:34,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 51 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 135 Invalid, 0 Unknown, 236 Unchecked, 1.0s Time] [2022-11-20 20:28:34,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2237 states. [2022-11-20 20:28:34,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2237 to 2208. [2022-11-20 20:28:34,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2208 states, 2141 states have (on average 4.114432508173751) internal successors, (8809), 2207 states have internal predecessors, (8809), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:34,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2208 states to 2208 states and 8809 transitions. [2022-11-20 20:28:34,926 INFO L78 Accepts]: Start accepts. Automaton has 2208 states and 8809 transitions. Word has length 11 [2022-11-20 20:28:34,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:28:34,926 INFO L495 AbstractCegarLoop]: Abstraction has 2208 states and 8809 transitions. [2022-11-20 20:28:34,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 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) [2022-11-20 20:28:34,927 INFO L276 IsEmpty]: Start isEmpty. Operand 2208 states and 8809 transitions. [2022-11-20 20:28:34,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:28:34,927 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:28:34,927 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:28:34,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:35,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:35,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (69)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:35,528 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:35,528 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:28:35,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:28:35,529 INFO L85 PathProgramCache]: Analyzing trace with hash 215903785, now seen corresponding path program 1 times [2022-11-20 20:28:35,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:28:35,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [238331278] [2022-11-20 20:28:35,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:28:35,529 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:35,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:28:35,530 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:28:35,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2022-11-20 20:28:35,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:28:35,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:28:35,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:35,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:35,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:28:36,245 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:28:36,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:36,342 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:28:36,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [238331278] [2022-11-20 20:28:36,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [238331278] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:28:36,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [179620576] [2022-11-20 20:28:36,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:28:36,344 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:28:36,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:28:36,345 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:28:36,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2022-11-20 20:28:36,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:28:36,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:28:36,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:36,928 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:28:37,286 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:37,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:28:37,619 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:37,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [179620576] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:28:37,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201469374] [2022-11-20 20:28:37,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:28:37,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:28:37,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:28:37,621 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:28:37,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2022-11-20 20:28:37,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:28:37,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:28:37,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:37,905 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:28:38,249 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:38,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:28:38,803 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:38,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201469374] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:28:38,804 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:28:38,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 20:28:38,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597587727] [2022-11-20 20:28:38,804 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:28:38,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 20:28:38,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:28:38,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 20:28:38,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:28:38,806 INFO L87 Difference]: Start difference. First operand 2208 states and 8809 transitions. Second operand has 21 states, 20 states have (on average 2.05) internal successors, (41), 21 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) [2022-11-20 20:28:42,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:28:42,355 INFO L93 Difference]: Finished difference Result 2284 states and 9106 transitions. [2022-11-20 20:28:42,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-20 20:28:42,356 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.05) internal successors, (41), 21 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) Word has length 11 [2022-11-20 20:28:42,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:28:42,362 INFO L225 Difference]: With dead ends: 2284 [2022-11-20 20:28:42,362 INFO L226 Difference]: Without dead ends: 2284 [2022-11-20 20:28:42,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2022-11-20 20:28:42,363 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 52 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:28:42,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 45 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 323 Invalid, 0 Unknown, 105 Unchecked, 2.3s Time] [2022-11-20 20:28:42,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2284 states. [2022-11-20 20:28:42,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2284 to 2228. [2022-11-20 20:28:42,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2228 states, 2161 states have (on average 4.110596945858399) internal successors, (8883), 2227 states have internal predecessors, (8883), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:42,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2228 states to 2228 states and 8883 transitions. [2022-11-20 20:28:42,447 INFO L78 Accepts]: Start accepts. Automaton has 2228 states and 8883 transitions. Word has length 11 [2022-11-20 20:28:42,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:28:42,447 INFO L495 AbstractCegarLoop]: Abstraction has 2228 states and 8883 transitions. [2022-11-20 20:28:42,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.05) internal successors, (41), 21 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) [2022-11-20 20:28:42,448 INFO L276 IsEmpty]: Start isEmpty. Operand 2228 states and 8883 transitions. [2022-11-20 20:28:42,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:28:42,448 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:28:42,449 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:28:42,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:42,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:42,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (73)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:43,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:28:43,058 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:28:43,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:28:43,059 INFO L85 PathProgramCache]: Analyzing trace with hash 215905345, now seen corresponding path program 1 times [2022-11-20 20:28:43,059 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:28:43,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [460192911] [2022-11-20 20:28:43,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:28:43,059 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:43,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:28:43,060 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:28:43,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2022-11-20 20:28:43,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:28:43,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 20:28:43,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:43,340 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:28:43,341 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:28:43,341 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:28:43,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [460192911] [2022-11-20 20:28:43,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [460192911] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:28:43,341 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:28:43,341 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:28:43,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492727730] [2022-11-20 20:28:43,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:28:43,342 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:28:43,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:28:43,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:28:43,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:28:43,343 INFO L87 Difference]: Start difference. First operand 2228 states and 8883 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:43,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:28:43,648 INFO L93 Difference]: Finished difference Result 1664 states and 6291 transitions. [2022-11-20 20:28:43,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:28:43,649 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:28:43,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:28:43,654 INFO L225 Difference]: With dead ends: 1664 [2022-11-20 20:28:43,655 INFO L226 Difference]: Without dead ends: 1664 [2022-11-20 20:28:43,655 INFO L412 NwaCegarLoop]: 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 [2022-11-20 20:28:43,655 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 30 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:28:43,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 3 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:28:43,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1664 states. [2022-11-20 20:28:43,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1664 to 1664. [2022-11-20 20:28:43,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1664 states, 1624 states have (on average 3.873768472906404) internal successors, (6291), 1663 states have internal predecessors, (6291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:43,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1664 states to 1664 states and 6291 transitions. [2022-11-20 20:28:43,689 INFO L78 Accepts]: Start accepts. Automaton has 1664 states and 6291 transitions. Word has length 11 [2022-11-20 20:28:43,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:28:43,689 INFO L495 AbstractCegarLoop]: Abstraction has 1664 states and 6291 transitions. [2022-11-20 20:28:43,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:43,689 INFO L276 IsEmpty]: Start isEmpty. Operand 1664 states and 6291 transitions. [2022-11-20 20:28:43,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:28:43,690 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:28:43,690 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:28:43,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (75)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:43,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:43,903 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:28:43,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:28:43,904 INFO L85 PathProgramCache]: Analyzing trace with hash 215698253, now seen corresponding path program 2 times [2022-11-20 20:28:43,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:28:43,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [403180550] [2022-11-20 20:28:43,904 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:28:43,904 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:43,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:28:43,905 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:28:43,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2022-11-20 20:28:44,161 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:28:44,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:28:44,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:28:44,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:44,403 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:28:44,404 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:28:44,616 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:28:44,617 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:28:44,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:28:44,723 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:28:44,742 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:28:44,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:28:44,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:28:44,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:28:44,984 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:28:44,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [403180550] [2022-11-20 20:28:44,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [403180550] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:28:44,984 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:28:44,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:28:44,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099853158] [2022-11-20 20:28:44,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:28:44,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:28:44,986 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:28:44,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:28:44,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:28:44,987 INFO L87 Difference]: Start difference. First operand 1664 states and 6291 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:45,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:28:45,417 INFO L93 Difference]: Finished difference Result 1674 states and 6331 transitions. [2022-11-20 20:28:45,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:28:45,418 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:28:45,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:28:45,423 INFO L225 Difference]: With dead ends: 1674 [2022-11-20 20:28:45,423 INFO L226 Difference]: Without dead ends: 1674 [2022-11-20 20:28:45,423 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:28:45,424 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 9 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:28:45,424 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 16 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 0 Unknown, 45 Unchecked, 0.3s Time] [2022-11-20 20:28:45,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1674 states. [2022-11-20 20:28:45,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1674 to 1674. [2022-11-20 20:28:45,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1674 states, 1634 states have (on average 3.8745410036719705) internal successors, (6331), 1673 states have internal predecessors, (6331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:45,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1674 states to 1674 states and 6331 transitions. [2022-11-20 20:28:45,462 INFO L78 Accepts]: Start accepts. Automaton has 1674 states and 6331 transitions. Word has length 11 [2022-11-20 20:28:45,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:28:45,463 INFO L495 AbstractCegarLoop]: Abstraction has 1674 states and 6331 transitions. [2022-11-20 20:28:45,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:45,463 INFO L276 IsEmpty]: Start isEmpty. Operand 1674 states and 6331 transitions. [2022-11-20 20:28:45,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:28:45,463 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:28:45,463 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:28:45,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (76)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:45,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:45,664 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:28:45,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:28:45,664 INFO L85 PathProgramCache]: Analyzing trace with hash 215698255, now seen corresponding path program 2 times [2022-11-20 20:28:45,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:28:45,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [261924017] [2022-11-20 20:28:45,665 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:28:45,665 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:45,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:28:45,666 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:28:45,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2022-11-20 20:28:45,911 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:28:45,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:28:45,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:28:45,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:45,936 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:28:46,150 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:28:46,150 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:28:46,150 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:28:46,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [261924017] [2022-11-20 20:28:46,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [261924017] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:28:46,151 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:28:46,151 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:28:46,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369806053] [2022-11-20 20:28:46,151 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:28:46,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:28:46,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:28:46,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:28:46,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:28:46,152 INFO L87 Difference]: Start difference. First operand 1674 states and 6331 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:46,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:28:46,501 INFO L93 Difference]: Finished difference Result 1920 states and 7309 transitions. [2022-11-20 20:28:46,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:28:46,501 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:28:46,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:28:46,507 INFO L225 Difference]: With dead ends: 1920 [2022-11-20 20:28:46,507 INFO L226 Difference]: Without dead ends: 1920 [2022-11-20 20:28:46,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:28:46,507 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:28:46,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 20 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 0 Unknown, 93 Unchecked, 0.3s Time] [2022-11-20 20:28:46,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1920 states. [2022-11-20 20:28:46,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1920 to 1770. [2022-11-20 20:28:46,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1770 states, 1730 states have (on average 3.9601156069364163) internal successors, (6851), 1769 states have internal predecessors, (6851), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:46,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1770 states to 1770 states and 6851 transitions. [2022-11-20 20:28:46,543 INFO L78 Accepts]: Start accepts. Automaton has 1770 states and 6851 transitions. Word has length 11 [2022-11-20 20:28:46,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:28:46,543 INFO L495 AbstractCegarLoop]: Abstraction has 1770 states and 6851 transitions. [2022-11-20 20:28:46,543 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:46,543 INFO L276 IsEmpty]: Start isEmpty. Operand 1770 states and 6851 transitions. [2022-11-20 20:28:46,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:28:46,543 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:28:46,544 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:28:46,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (77)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:46,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:46,744 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:28:46,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:28:46,745 INFO L85 PathProgramCache]: Analyzing trace with hash 214256753, now seen corresponding path program 3 times [2022-11-20 20:28:46,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:28:46,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1635154693] [2022-11-20 20:28:46,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:28:46,746 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:46,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:28:46,747 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:28:46,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2022-11-20 20:28:47,002 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-20 20:28:47,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:28:47,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:28:47,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:47,218 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:28:47,218 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:28:47,418 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:28:47,419 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:28:47,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:28:47,536 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:28:47,558 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:28:47,558 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:28:47,772 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:28:47,772 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:28:47,773 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:28:47,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1635154693] [2022-11-20 20:28:47,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1635154693] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:28:47,773 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:28:47,773 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:28:47,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383802816] [2022-11-20 20:28:47,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:28:47,774 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:28:47,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:28:47,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:28:47,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:28:47,775 INFO L87 Difference]: Start difference. First operand 1770 states and 6851 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:48,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:28:48,246 INFO L93 Difference]: Finished difference Result 1772 states and 6859 transitions. [2022-11-20 20:28:48,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:28:48,247 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:28:48,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:28:48,252 INFO L225 Difference]: With dead ends: 1772 [2022-11-20 20:28:48,252 INFO L226 Difference]: Without dead ends: 1772 [2022-11-20 20:28:48,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:28:48,253 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 8 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:28:48,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 16 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 79 Invalid, 0 Unknown, 54 Unchecked, 0.4s Time] [2022-11-20 20:28:48,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1772 states. [2022-11-20 20:28:48,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1772 to 1772. [2022-11-20 20:28:48,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1772 states, 1732 states have (on average 3.9601616628175518) internal successors, (6859), 1771 states have internal predecessors, (6859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:48,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1772 states to 1772 states and 6859 transitions. [2022-11-20 20:28:48,289 INFO L78 Accepts]: Start accepts. Automaton has 1772 states and 6859 transitions. Word has length 11 [2022-11-20 20:28:48,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:28:48,289 INFO L495 AbstractCegarLoop]: Abstraction has 1772 states and 6859 transitions. [2022-11-20 20:28:48,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:48,290 INFO L276 IsEmpty]: Start isEmpty. Operand 1772 states and 6859 transitions. [2022-11-20 20:28:48,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:28:48,290 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:28:48,290 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:28:48,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (78)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:48,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:48,491 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:28:48,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:28:48,491 INFO L85 PathProgramCache]: Analyzing trace with hash 214256755, now seen corresponding path program 3 times [2022-11-20 20:28:48,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:28:48,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2111981783] [2022-11-20 20:28:48,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:28:48,492 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:48,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:28:48,494 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:28:48,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2022-11-20 20:28:48,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-20 20:28:48,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:28:48,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:28:48,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:48,766 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:28:48,978 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:28:48,978 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:28:48,979 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:28:48,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2111981783] [2022-11-20 20:28:48,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2111981783] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:28:48,979 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:28:48,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:28:48,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764648160] [2022-11-20 20:28:48,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:28:48,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:28:48,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:28:48,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:28:48,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:28:48,980 INFO L87 Difference]: Start difference. First operand 1772 states and 6859 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:49,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:28:49,380 INFO L93 Difference]: Finished difference Result 2104 states and 8117 transitions. [2022-11-20 20:28:49,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:28:49,380 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:28:49,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:28:49,386 INFO L225 Difference]: With dead ends: 2104 [2022-11-20 20:28:49,387 INFO L226 Difference]: Without dead ends: 2104 [2022-11-20 20:28:49,387 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:28:49,387 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 23 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:28:49,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 20 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 79 Invalid, 0 Unknown, 108 Unchecked, 0.3s Time] [2022-11-20 20:28:49,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2104 states. [2022-11-20 20:28:49,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2104 to 1762. [2022-11-20 20:28:49,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1762 states, 1722 states have (on average 3.9518002322880372) internal successors, (6805), 1761 states have internal predecessors, (6805), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:49,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1762 states to 1762 states and 6805 transitions. [2022-11-20 20:28:49,443 INFO L78 Accepts]: Start accepts. Automaton has 1762 states and 6805 transitions. Word has length 11 [2022-11-20 20:28:49,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:28:49,443 INFO L495 AbstractCegarLoop]: Abstraction has 1762 states and 6805 transitions. [2022-11-20 20:28:49,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:28:49,443 INFO L276 IsEmpty]: Start isEmpty. Operand 1762 states and 6805 transitions. [2022-11-20 20:28:49,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:28:49,444 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:28:49,444 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:28:49,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2022-11-20 20:28:49,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:49,647 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:28:49,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:28:49,648 INFO L85 PathProgramCache]: Analyzing trace with hash 7805123, now seen corresponding path program 4 times [2022-11-20 20:28:49,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:28:49,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1480926448] [2022-11-20 20:28:49,648 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:28:49,648 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:28:49,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:28:49,649 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:28:49,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2022-11-20 20:28:49,952 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:28:49,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:28:49,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:28:49,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:50,169 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:28:50,169 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:28:50,364 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:28:50,364 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:28:50,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:28:50,540 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:28:50,553 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:28:50,553 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:28:50,780 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:50,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:28:55,476 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:55,477 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:28:55,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1480926448] [2022-11-20 20:28:55,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1480926448] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:28:55,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1076067227] [2022-11-20 20:28:55,477 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:28:55,477 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:28:55,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:28:55,478 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:28:55,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2022-11-20 20:28:56,030 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:28:56,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:28:56,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:28:56,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:56,231 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:28:56,232 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:28:56,430 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:28:56,430 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:28:56,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:28:56,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:28:56,715 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:28:56,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:28:57,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:57,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:28:58,145 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:28:58,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1076067227] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:28:58,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870832701] [2022-11-20 20:28:58,145 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:28:58,145 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:28:58,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:28:58,146 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:28:58,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2022-11-20 20:28:58,435 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:28:58,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:28:58,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:28:58,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:28:58,615 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:28:58,616 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:28:58,839 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-20 20:28:58,840 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2022-11-20 20:28:59,409 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:28:59,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:29:01,027 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:29:01,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870832701] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:29:01,027 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:29:01,028 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 6, 6] total 22 [2022-11-20 20:29:01,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939350683] [2022-11-20 20:29:01,028 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:29:01,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 20:29:01,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:29:01,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 20:29:01,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2022-11-20 20:29:01,029 INFO L87 Difference]: Start difference. First operand 1762 states and 6805 transitions. Second operand has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 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) [2022-11-20 20:29:04,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:29:04,397 INFO L93 Difference]: Finished difference Result 1932 states and 7282 transitions. [2022-11-20 20:29:04,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 20:29:04,398 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 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) Word has length 11 [2022-11-20 20:29:04,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:29:04,403 INFO L225 Difference]: With dead ends: 1932 [2022-11-20 20:29:04,403 INFO L226 Difference]: Without dead ends: 1932 [2022-11-20 20:29:04,403 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2022-11-20 20:29:04,404 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 36 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 225 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:29:04,404 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 65 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 138 Invalid, 0 Unknown, 225 Unchecked, 1.1s Time] [2022-11-20 20:29:04,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1932 states. [2022-11-20 20:29:04,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1932 to 1812. [2022-11-20 20:29:04,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1812 states, 1772 states have (on average 3.9288939051918734) internal successors, (6962), 1811 states have internal predecessors, (6962), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:29:04,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1812 states to 1812 states and 6962 transitions. [2022-11-20 20:29:04,440 INFO L78 Accepts]: Start accepts. Automaton has 1812 states and 6962 transitions. Word has length 11 [2022-11-20 20:29:04,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:29:04,440 INFO L495 AbstractCegarLoop]: Abstraction has 1812 states and 6962 transitions. [2022-11-20 20:29:04,440 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 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) [2022-11-20 20:29:04,440 INFO L276 IsEmpty]: Start isEmpty. Operand 1812 states and 6962 transitions. [2022-11-20 20:29:04,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:29:04,441 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:29:04,441 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1] [2022-11-20 20:29:04,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (80)] Forceful destruction successful, exit code 0 [2022-11-20 20:29:04,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2022-11-20 20:29:04,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (81)] Forceful destruction successful, exit code 0 [2022-11-20 20:29:05,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:29:05,042 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:29:05,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:29:05,042 INFO L85 PathProgramCache]: Analyzing trace with hash -1511929215, now seen corresponding path program 3 times [2022-11-20 20:29:05,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:29:05,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [564391892] [2022-11-20 20:29:05,043 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:29:05,043 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:29:05,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:29:05,044 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:29:05,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2022-11-20 20:29:05,413 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 20:29:05,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:29:05,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:29:05,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:29:05,608 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:29:05,608 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:29:06,277 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:29:06,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:29:10,189 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:29:10,189 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:29:10,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [564391892] [2022-11-20 20:29:10,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [564391892] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:29:10,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [218893822] [2022-11-20 20:29:10,189 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:29:10,190 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:29:10,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:29:10,191 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:29:10,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2022-11-20 20:29:11,371 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 20:29:11,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:29:11,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:29:11,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:29:11,590 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:29:11,590 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:29:11,886 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:29:11,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:29:12,415 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:29:12,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [218893822] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:29:12,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822343572] [2022-11-20 20:29:12,416 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:29:12,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:29:12,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:29:12,417 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:29:12,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2022-11-20 20:29:14,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 20:29:14,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:29:14,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:29:14,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:29:14,961 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:29:14,962 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:29:15,161 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:29:15,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:29:15,660 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:29:15,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822343572] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:29:15,661 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:29:15,661 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11, 11] total 22 [2022-11-20 20:29:15,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611436666] [2022-11-20 20:29:15,661 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:29:15,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 20:29:15,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:29:15,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 20:29:15,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2022-11-20 20:29:15,663 INFO L87 Difference]: Start difference. First operand 1812 states and 6962 transitions. Second operand has 24 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:29:38,140 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:29:40,143 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:29:42,146 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:29:44,149 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:29:46,153 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:29:48,156 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:29:50,179 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:29:52,182 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:29:54,185 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:29:56,188 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 20:30:06,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:30:06,060 INFO L93 Difference]: Finished difference Result 10032 states and 37708 transitions. [2022-11-20 20:30:06,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-20 20:30:06,062 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:30:06,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:30:06,096 INFO L225 Difference]: With dead ends: 10032 [2022-11-20 20:30:06,096 INFO L226 Difference]: Without dead ends: 10032 [2022-11-20 20:30:06,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=406, Invalid=716, Unknown=0, NotChecked=0, Total=1122 [2022-11-20 20:30:06,097 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 2680 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 3880 mSolverCounterSat, 220 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2680 SdHoareTripleChecker+Valid, 360 SdHoareTripleChecker+Invalid, 4110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 220 IncrementalHoareTripleChecker+Valid, 3880 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 33.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:30:06,097 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2680 Valid, 360 Invalid, 4110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [220 Valid, 3880 Invalid, 10 Unknown, 0 Unchecked, 33.4s Time] [2022-11-20 20:30:06,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10032 states. [2022-11-20 20:30:06,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10032 to 1819. [2022-11-20 20:30:06,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1819 states, 1779 states have (on average 3.920741989881956) internal successors, (6975), 1818 states have internal predecessors, (6975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:30:06,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1819 states to 1819 states and 6975 transitions. [2022-11-20 20:30:06,196 INFO L78 Accepts]: Start accepts. Automaton has 1819 states and 6975 transitions. Word has length 12 [2022-11-20 20:30:06,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:30:06,197 INFO L495 AbstractCegarLoop]: Abstraction has 1819 states and 6975 transitions. [2022-11-20 20:30:06,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:30:06,197 INFO L276 IsEmpty]: Start isEmpty. Operand 1819 states and 6975 transitions. [2022-11-20 20:30:06,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:30:06,198 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:30:06,198 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:30:06,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (83)] Forceful destruction successful, exit code 0 [2022-11-20 20:30:06,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (84)] Forceful destruction successful, exit code 0 [2022-11-20 20:30:06,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2022-11-20 20:30:06,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:30:06,816 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:30:06,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:30:06,816 INFO L85 PathProgramCache]: Analyzing trace with hash -250974821, now seen corresponding path program 1 times [2022-11-20 20:30:06,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:30:06,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1433958826] [2022-11-20 20:30:06,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:30:06,817 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:30:06,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:30:06,818 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:30:06,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2022-11-20 20:30:07,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:30:07,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:30:07,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:30:07,491 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:30:07,491 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:30:07,706 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:30:07,706 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:30:07,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:30:07,940 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-11-20 20:30:07,955 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:30:07,955 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:30:08,288 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:30:08,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:30:09,662 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:30:09,662 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:30:09,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1433958826] [2022-11-20 20:30:09,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1433958826] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:30:09,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1643260664] [2022-11-20 20:30:09,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:30:09,663 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:30:09,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:30:09,664 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:30:09,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2022-11-20 20:30:10,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:30:10,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 20:30:10,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:30:10,727 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:30:10,727 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:30:10,934 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:30:10,934 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:30:11,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:30:11,365 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:30:11,386 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:30:11,386 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:30:12,015 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:30:12,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:30:14,339 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:30:14,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1643260664] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:30:14,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628670639] [2022-11-20 20:30:14,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:30:14,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:30:14,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:30:14,341 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:30:14,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2022-11-20 20:30:14,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:30:14,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-20 20:30:14,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:30:14,865 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:30:14,866 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:30:15,452 INFO L321 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2022-11-20 20:30:15,452 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:30:16,135 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:30:16,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:30:23,099 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:30:23,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1628670639] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:30:23,100 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:30:23,100 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 9, 9] total 35 [2022-11-20 20:30:23,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828970611] [2022-11-20 20:30:23,100 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:30:23,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-20 20:30:23,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:30:23,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-20 20:30:23,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1114, Unknown=1, NotChecked=0, Total=1332 [2022-11-20 20:30:23,101 INFO L87 Difference]: Start difference. First operand 1819 states and 6975 transitions. Second operand has 37 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 36 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:30:53,694 WARN L233 SmtUtils]: Spent 28.84s on a formula simplification. DAG size of input: 74 DAG size of output: 73 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:31:15,903 WARN L233 SmtUtils]: Spent 21.73s on a formula simplification that was a NOOP. DAG size: 48 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:31:21,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:31:21,433 INFO L93 Difference]: Finished difference Result 3424 states and 14372 transitions. [2022-11-20 20:31:21,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-20 20:31:21,434 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 36 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:31:21,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:31:21,445 INFO L225 Difference]: With dead ends: 3424 [2022-11-20 20:31:21,445 INFO L226 Difference]: Without dead ends: 3424 [2022-11-20 20:31:21,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 708 ImplicationChecksByTransitivity, 64.9s TimeCoverageRelationStatistics Valid=412, Invalid=2037, Unknown=1, NotChecked=0, Total=2450 [2022-11-20 20:31:21,446 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 215 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 1178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 653 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:31:21,446 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [215 Valid, 176 Invalid, 1178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 517 Invalid, 0 Unknown, 653 Unchecked, 4.5s Time] [2022-11-20 20:31:21,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3424 states. [2022-11-20 20:31:21,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3424 to 2209. [2022-11-20 20:31:21,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2209 states, 2169 states have (on average 4.094974642692485) internal successors, (8882), 2208 states have internal predecessors, (8882), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:31:21,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2209 states to 2209 states and 8882 transitions. [2022-11-20 20:31:21,515 INFO L78 Accepts]: Start accepts. Automaton has 2209 states and 8882 transitions. Word has length 12 [2022-11-20 20:31:21,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:31:21,515 INFO L495 AbstractCegarLoop]: Abstraction has 2209 states and 8882 transitions. [2022-11-20 20:31:21,515 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 36 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:31:21,515 INFO L276 IsEmpty]: Start isEmpty. Operand 2209 states and 8882 transitions. [2022-11-20 20:31:21,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:31:21,516 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:31:21,516 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:31:21,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (86)] Forceful destruction successful, exit code 0 [2022-11-20 20:31:21,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2022-11-20 20:31:21,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2022-11-20 20:31:22,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:31:22,117 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:31:22,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:31:22,117 INFO L85 PathProgramCache]: Analyzing trace with hash -250974819, now seen corresponding path program 1 times [2022-11-20 20:31:22,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:31:22,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [385880795] [2022-11-20 20:31:22,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:31:22,118 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:31:22,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:31:22,119 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:31:22,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2022-11-20 20:31:22,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:31:22,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:31:22,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:31:22,656 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:22,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:31:23,094 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 20:31:23,389 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:23,389 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:31:23,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [385880795] [2022-11-20 20:31:23,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [385880795] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:31:23,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [795940058] [2022-11-20 20:31:23,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:31:23,392 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:31:23,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:31:23,393 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:31:23,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2022-11-20 20:31:24,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:31:24,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:31:24,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:31:24,273 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:31:24,773 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:24,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:31:25,394 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:25,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [795940058] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:31:25,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191423898] [2022-11-20 20:31:25,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:31:25,395 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:31:25,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:31:25,396 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:31:25,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2022-11-20 20:31:25,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:31:25,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:31:25,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:31:25,854 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:31:26,414 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:26,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:31:27,384 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:27,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191423898] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:31:27,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:31:27,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 30 [2022-11-20 20:31:27,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100223052] [2022-11-20 20:31:27,384 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:31:27,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-20 20:31:27,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:31:27,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-20 20:31:27,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2022-11-20 20:31:27,386 INFO L87 Difference]: Start difference. First operand 2209 states and 8882 transitions. Second operand has 31 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 31 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) [2022-11-20 20:31:34,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:31:34,322 INFO L93 Difference]: Finished difference Result 2610 states and 9909 transitions. [2022-11-20 20:31:34,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-20 20:31:34,323 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 31 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) Word has length 12 [2022-11-20 20:31:34,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:31:34,330 INFO L225 Difference]: With dead ends: 2610 [2022-11-20 20:31:34,330 INFO L226 Difference]: Without dead ends: 2610 [2022-11-20 20:31:34,330 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=363, Invalid=1893, Unknown=0, NotChecked=0, Total=2256 [2022-11-20 20:31:34,331 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 261 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 735 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:31:34,331 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 61 Invalid, 897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 735 Invalid, 0 Unknown, 92 Unchecked, 4.3s Time] [2022-11-20 20:31:34,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2610 states. [2022-11-20 20:31:34,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2610 to 2212. [2022-11-20 20:31:34,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2212 states, 2172 states have (on average 4.093462246777164) internal successors, (8891), 2211 states have internal predecessors, (8891), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:31:34,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2212 states to 2212 states and 8891 transitions. [2022-11-20 20:31:34,376 INFO L78 Accepts]: Start accepts. Automaton has 2212 states and 8891 transitions. Word has length 12 [2022-11-20 20:31:34,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:31:34,376 INFO L495 AbstractCegarLoop]: Abstraction has 2212 states and 8891 transitions. [2022-11-20 20:31:34,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 31 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) [2022-11-20 20:31:34,376 INFO L276 IsEmpty]: Start isEmpty. Operand 2212 states and 8891 transitions. [2022-11-20 20:31:34,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:31:34,377 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:31:34,377 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-20 20:31:34,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (90)] Forceful destruction successful, exit code 0 [2022-11-20 20:31:34,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2022-11-20 20:31:34,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (89)] Forceful destruction successful, exit code 0 [2022-11-20 20:31:34,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:31:34,978 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:31:34,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:31:34,978 INFO L85 PathProgramCache]: Analyzing trace with hash -257622058, now seen corresponding path program 3 times [2022-11-20 20:31:34,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:31:34,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1157846480] [2022-11-20 20:31:34,979 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:31:34,979 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:31:34,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:31:34,980 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:31:34,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2022-11-20 20:31:35,338 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 20:31:35,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:31:35,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:31:35,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:31:35,558 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:31:35,559 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:31:35,792 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:31:35,793 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:31:35,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:31:35,916 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:31:35,931 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:31:35,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:31:36,188 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:31:36,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:31:37,479 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:31:37,479 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:31:37,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1157846480] [2022-11-20 20:31:37,480 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1157846480] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:31:37,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1748143051] [2022-11-20 20:31:37,480 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:31:37,480 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:31:37,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:31:37,481 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:31:37,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2022-11-20 20:31:38,110 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 20:31:38,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:31:38,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:31:38,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:31:38,587 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:38,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:31:39,307 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:39,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1748143051] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:31:39,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659378333] [2022-11-20 20:31:39,307 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:31:39,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:31:39,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:31:39,308 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:31:39,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2022-11-20 20:31:39,660 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 20:31:39,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:31:39,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:31:39,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:31:39,856 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:39,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:31:40,153 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:31:40,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659378333] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:31:40,154 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:31:40,154 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 7, 7, 7, 7] total 26 [2022-11-20 20:31:40,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097954654] [2022-11-20 20:31:40,154 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:31:40,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-20 20:31:40,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:31:40,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-20 20:31:40,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=623, Unknown=0, NotChecked=0, Total=756 [2022-11-20 20:31:40,156 INFO L87 Difference]: Start difference. First operand 2212 states and 8891 transitions. Second operand has 28 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 27 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) [2022-11-20 20:31:59,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:31:59,342 INFO L93 Difference]: Finished difference Result 5821 states and 20877 transitions. [2022-11-20 20:31:59,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-20 20:31:59,343 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 27 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) Word has length 12 [2022-11-20 20:31:59,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:31:59,359 INFO L225 Difference]: With dead ends: 5821 [2022-11-20 20:31:59,359 INFO L226 Difference]: Without dead ends: 5821 [2022-11-20 20:31:59,360 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 909 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=612, Invalid=2810, Unknown=0, NotChecked=0, Total=3422 [2022-11-20 20:31:59,360 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 1526 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 2082 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1526 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 2335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 2082 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 194 IncrementalHoareTripleChecker+Unchecked, 11.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:31:59,361 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1526 Valid, 228 Invalid, 2335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 2082 Invalid, 0 Unknown, 194 Unchecked, 11.2s Time] [2022-11-20 20:31:59,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5821 states. [2022-11-20 20:31:59,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5821 to 2678. [2022-11-20 20:31:59,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2678 states, 2638 states have (on average 4.163002274450341) internal successors, (10982), 2677 states have internal predecessors, (10982), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:31:59,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2678 states to 2678 states and 10982 transitions. [2022-11-20 20:31:59,449 INFO L78 Accepts]: Start accepts. Automaton has 2678 states and 10982 transitions. Word has length 12 [2022-11-20 20:31:59,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:31:59,449 INFO L495 AbstractCegarLoop]: Abstraction has 2678 states and 10982 transitions. [2022-11-20 20:31:59,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 27 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) [2022-11-20 20:31:59,449 INFO L276 IsEmpty]: Start isEmpty. Operand 2678 states and 10982 transitions. [2022-11-20 20:31:59,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:31:59,450 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:31:59,450 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:31:59,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2022-11-20 20:31:59,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2022-11-20 20:31:59,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (92)] Forceful destruction successful, exit code 0 [2022-11-20 20:32:00,050 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:32:00,051 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:32:00,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:32:00,051 INFO L85 PathProgramCache]: Analyzing trace with hash -257622459, now seen corresponding path program 2 times [2022-11-20 20:32:00,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:32:00,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [92858485] [2022-11-20 20:32:00,051 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:32:00,052 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:32:00,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:32:00,052 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:32:00,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2022-11-20 20:32:00,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:32:00,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:32:00,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:32:00,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:00,489 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:32:00,489 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:32:00,561 INFO L321 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2022-11-20 20:32:00,561 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:32:00,756 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-20 20:32:00,756 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:32:00,756 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:32:00,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [92858485] [2022-11-20 20:32:00,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [92858485] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:32:00,756 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:32:00,757 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:32:00,757 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701654150] [2022-11-20 20:32:00,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:32:00,757 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:32:00,757 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:32:00,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:32:00,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:32:00,758 INFO L87 Difference]: Start difference. First operand 2678 states and 10982 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:32:01,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:32:01,110 INFO L93 Difference]: Finished difference Result 2673 states and 10953 transitions. [2022-11-20 20:32:01,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:32:01,111 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:32:01,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:32:01,121 INFO L225 Difference]: With dead ends: 2673 [2022-11-20 20:32:01,121 INFO L226 Difference]: Without dead ends: 2673 [2022-11-20 20:32:01,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:32:01,122 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:32:01,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 12 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 60 Unchecked, 0.3s Time] [2022-11-20 20:32:01,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2673 states. [2022-11-20 20:32:01,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2673 to 2667. [2022-11-20 20:32:01,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2667 states, 2628 states have (on average 4.16248097412481) internal successors, (10939), 2666 states have internal predecessors, (10939), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:32:01,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2667 states to 2667 states and 10939 transitions. [2022-11-20 20:32:01,229 INFO L78 Accepts]: Start accepts. Automaton has 2667 states and 10939 transitions. Word has length 12 [2022-11-20 20:32:01,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:32:01,230 INFO L495 AbstractCegarLoop]: Abstraction has 2667 states and 10939 transitions. [2022-11-20 20:32:01,230 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:32:01,230 INFO L276 IsEmpty]: Start isEmpty. Operand 2667 states and 10939 transitions. [2022-11-20 20:32:01,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:32:01,230 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:32:01,230 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:32:01,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (95)] Forceful destruction successful, exit code 0 [2022-11-20 20:32:01,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:32:01,431 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:32:01,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:32:01,431 INFO L85 PathProgramCache]: Analyzing trace with hash -1896918668, now seen corresponding path program 1 times [2022-11-20 20:32:01,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:32:01,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1920618561] [2022-11-20 20:32:01,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:32:01,432 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:32:01,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:32:01,433 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:32:01,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (96)] Waiting until timeout for monitored process [2022-11-20 20:32:01,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:32:01,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:32:01,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:01,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:01,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:32:02,136 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:32:02,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:02,228 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:32:02,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1920618561] [2022-11-20 20:32:02,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1920618561] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:32:02,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1493822123] [2022-11-20 20:32:02,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:32:02,229 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:32:02,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:32:02,229 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:32:02,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (97)] Waiting until timeout for monitored process [2022-11-20 20:32:02,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:32:02,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:32:02,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:02,865 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:32:03,197 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:03,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:32:03,522 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:03,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1493822123] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:32:03,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819413031] [2022-11-20 20:32:03,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:32:03,522 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:32:03,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:32:03,523 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:32:03,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2022-11-20 20:32:03,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:32:03,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:32:03,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:03,856 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:32:04,192 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:04,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:32:04,770 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:04,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819413031] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:32:04,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:32:04,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 20:32:04,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506747717] [2022-11-20 20:32:04,771 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:32:04,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 20:32:04,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:32:04,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 20:32:04,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:32:04,772 INFO L87 Difference]: Start difference. First operand 2667 states and 10939 transitions. Second operand has 21 states, 20 states have (on average 2.2) internal successors, (44), 21 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) [2022-11-20 20:32:07,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:32:07,941 INFO L93 Difference]: Finished difference Result 2725 states and 11219 transitions. [2022-11-20 20:32:07,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 20:32:07,943 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.2) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:32:07,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:32:07,950 INFO L225 Difference]: With dead ends: 2725 [2022-11-20 20:32:07,950 INFO L226 Difference]: Without dead ends: 2725 [2022-11-20 20:32:07,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=164, Invalid=766, Unknown=0, NotChecked=0, Total=930 [2022-11-20 20:32:07,951 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 41 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 146 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:32:07,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 62 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 290 Invalid, 0 Unknown, 146 Unchecked, 2.0s Time] [2022-11-20 20:32:07,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2725 states. [2022-11-20 20:32:08,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2725 to 2707. [2022-11-20 20:32:08,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2707 states, 2668 states have (on average 4.187781109445277) internal successors, (11173), 2706 states have internal predecessors, (11173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:32:08,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2707 states to 2707 states and 11173 transitions. [2022-11-20 20:32:08,019 INFO L78 Accepts]: Start accepts. Automaton has 2707 states and 11173 transitions. Word has length 12 [2022-11-20 20:32:08,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:32:08,019 INFO L495 AbstractCegarLoop]: Abstraction has 2707 states and 11173 transitions. [2022-11-20 20:32:08,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.2) internal successors, (44), 21 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) [2022-11-20 20:32:08,019 INFO L276 IsEmpty]: Start isEmpty. Operand 2707 states and 11173 transitions. [2022-11-20 20:32:08,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:32:08,020 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:32:08,020 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:32:08,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (97)] Forceful destruction successful, exit code 0 [2022-11-20 20:32:08,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (96)] Forceful destruction successful, exit code 0 [2022-11-20 20:32:08,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Forceful destruction successful, exit code 0 [2022-11-20 20:32:08,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:32:08,621 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:32:08,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:32:08,621 INFO L85 PathProgramCache]: Analyzing trace with hash -1896873139, now seen corresponding path program 1 times [2022-11-20 20:32:08,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:32:08,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1742198528] [2022-11-20 20:32:08,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:32:08,622 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:32:08,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:32:08,622 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:32:08,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (99)] Waiting until timeout for monitored process [2022-11-20 20:32:08,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:32:08,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:32:08,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:09,115 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:32:09,115 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:32:09,252 INFO L321 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2022-11-20 20:32:09,252 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:32:09,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:09,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:32:11,335 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:11,335 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:32:11,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1742198528] [2022-11-20 20:32:11,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1742198528] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:32:11,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [7480787] [2022-11-20 20:32:11,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:32:11,336 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:32:11,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:32:11,337 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:32:11,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (100)] Waiting until timeout for monitored process [2022-11-20 20:32:11,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:32:11,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 20:32:11,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:12,120 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:32:12,120 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:32:12,303 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:32:12,303 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:32:12,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:32:12,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:32:12,609 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:32:12,609 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:32:13,179 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:13,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:32:25,350 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:25,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [7480787] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:32:25,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773174665] [2022-11-20 20:32:25,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:32:25,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:32:25,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:32:25,351 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:32:25,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2022-11-20 20:32:25,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:32:25,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 20:32:25,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:25,825 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:32:25,825 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:32:26,121 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-20 20:32:26,121 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2022-11-20 20:32:27,072 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:32:27,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:32:32,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:32:32,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773174665] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:32:32,173 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:32:32,173 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 29 [2022-11-20 20:32:32,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269893907] [2022-11-20 20:32:32,173 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:32:32,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-20 20:32:32,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:32:32,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-20 20:32:32,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=774, Unknown=2, NotChecked=0, Total=930 [2022-11-20 20:32:32,174 INFO L87 Difference]: Start difference. First operand 2707 states and 11173 transitions. Second operand has 31 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 30 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:32:43,815 WARN L233 SmtUtils]: Spent 7.73s on a formula simplification. DAG size of input: 47 DAG size of output: 29 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:32:45,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:32:45,017 INFO L93 Difference]: Finished difference Result 2814 states and 11678 transitions. [2022-11-20 20:32:45,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 20:32:45,018 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 30 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:32:45,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:32:45,025 INFO L225 Difference]: With dead ends: 2814 [2022-11-20 20:32:45,025 INFO L226 Difference]: Without dead ends: 2814 [2022-11-20 20:32:45,026 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 31.0s TimeCoverageRelationStatistics Valid=205, Invalid=1052, Unknown=3, NotChecked=0, Total=1260 [2022-11-20 20:32:45,026 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 34 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 168 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:32:45,026 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 54 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 130 Invalid, 0 Unknown, 168 Unchecked, 1.0s Time] [2022-11-20 20:32:45,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2814 states. [2022-11-20 20:32:45,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2814 to 2814. [2022-11-20 20:32:45,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2814 states, 2775 states have (on average 4.208288288288288) internal successors, (11678), 2813 states have internal predecessors, (11678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:32:45,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2814 states to 2814 states and 11678 transitions. [2022-11-20 20:32:45,076 INFO L78 Accepts]: Start accepts. Automaton has 2814 states and 11678 transitions. Word has length 12 [2022-11-20 20:32:45,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:32:45,076 INFO L495 AbstractCegarLoop]: Abstraction has 2814 states and 11678 transitions. [2022-11-20 20:32:45,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 30 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:32:45,076 INFO L276 IsEmpty]: Start isEmpty. Operand 2814 states and 11678 transitions. [2022-11-20 20:32:45,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:32:45,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:32:45,076 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:32:45,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Forceful destruction successful, exit code 0 [2022-11-20 20:32:45,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (99)] Forceful destruction successful, exit code 0 [2022-11-20 20:32:45,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (100)] Forceful destruction successful, exit code 0 [2022-11-20 20:32:45,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:32:45,677 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting thread3Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:32:45,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:32:45,678 INFO L85 PathProgramCache]: Analyzing trace with hash -1896873137, now seen corresponding path program 1 times [2022-11-20 20:32:45,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:32:45,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [870144629] [2022-11-20 20:32:45,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:32:45,678 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:32:45,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:32:45,680 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:32:45,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2022-11-20 20:32:45,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:32:45,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-20 20:32:45,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:46,074 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:32:46,437 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:32:46,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:32:47,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:47,309 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:32:47,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [870144629] [2022-11-20 20:32:47,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [870144629] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:32:47,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1798689724] [2022-11-20 20:32:47,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:32:47,310 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:32:47,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:32:47,311 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:32:47,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2022-11-20 20:32:47,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:32:47,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:32:47,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:47,967 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:32:48,407 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:48,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:32:58,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:32:58,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1798689724] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:32:58,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559285375] [2022-11-20 20:32:58,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:32:58,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:32:58,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:32:58,730 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:32:58,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2022-11-20 20:32:59,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:32:59,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:32:59,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:32:59,078 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:32:59,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:32:59,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:33:03,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:33:03,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559285375] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:33:03,901 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:33:03,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5, 5, 6, 6] total 26 [2022-11-20 20:33:03,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372453727] [2022-11-20 20:33:03,901 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:33:03,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-20 20:33:03,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:33:03,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-20 20:33:03,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=558, Unknown=5, NotChecked=0, Total=702 [2022-11-20 20:33:03,903 INFO L87 Difference]: Start difference. First operand 2814 states and 11678 transitions. Second operand has 27 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 27 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) [2022-11-20 20:33:32,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:33:32,945 INFO L93 Difference]: Finished difference Result 4440 states and 17379 transitions. [2022-11-20 20:33:32,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-20 20:33:32,947 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 27 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:33:32,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:33:32,965 INFO L225 Difference]: With dead ends: 4440 [2022-11-20 20:33:32,965 INFO L226 Difference]: Without dead ends: 4440 [2022-11-20 20:33:32,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 40.6s TimeCoverageRelationStatistics Valid=342, Invalid=1204, Unknown=14, NotChecked=0, Total=1560 [2022-11-20 20:33:32,966 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 473 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 487 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 473 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 1505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1015 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:33:32,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [473 Valid, 84 Invalid, 1505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 487 Invalid, 0 Unknown, 1015 Unchecked, 3.3s Time] [2022-11-20 20:33:32,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4440 states. [2022-11-20 20:33:33,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4440 to 3223. [2022-11-20 20:33:33,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3223 states, 3184 states have (on average 4.175251256281407) internal successors, (13294), 3222 states have internal predecessors, (13294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:33:33,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3223 states to 3223 states and 13294 transitions. [2022-11-20 20:33:33,036 INFO L78 Accepts]: Start accepts. Automaton has 3223 states and 13294 transitions. Word has length 12 [2022-11-20 20:33:33,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:33:33,037 INFO L495 AbstractCegarLoop]: Abstraction has 3223 states and 13294 transitions. [2022-11-20 20:33:33,037 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 27 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) [2022-11-20 20:33:33,037 INFO L276 IsEmpty]: Start isEmpty. Operand 3223 states and 13294 transitions. [2022-11-20 20:33:33,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:33:33,037 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:33:33,037 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:33:33,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (103)] Forceful destruction successful, exit code 0 [2022-11-20 20:33:33,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Forceful destruction successful, exit code 0 [2022-11-20 20:33:33,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (102)] Forceful destruction successful, exit code 0 [2022-11-20 20:33:33,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:33:33,638 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:33:33,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:33:33,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1896874028, now seen corresponding path program 2 times [2022-11-20 20:33:33,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:33:33,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1602297681] [2022-11-20 20:33:33,639 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:33:33,639 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:33:33,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:33:33,640 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:33:33,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2022-11-20 20:33:33,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:33:33,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:33:33,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:33:33,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:33:33,946 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:33:34,236 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:33:34,236 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:33:34,237 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:33:34,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1602297681] [2022-11-20 20:33:34,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1602297681] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:33:34,237 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:33:34,237 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:33:34,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775713734] [2022-11-20 20:33:34,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:33:34,237 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:33:34,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:33:34,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:33:34,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:33:34,238 INFO L87 Difference]: Start difference. First operand 3223 states and 13294 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:33:34,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:33:34,499 INFO L93 Difference]: Finished difference Result 3253 states and 13505 transitions. [2022-11-20 20:33:34,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:33:34,500 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:33:34,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:33:34,508 INFO L225 Difference]: With dead ends: 3253 [2022-11-20 20:33:34,508 INFO L226 Difference]: Without dead ends: 3253 [2022-11-20 20:33:34,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:33:34,508 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 11 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:33:34,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 20 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 59 Unchecked, 0.2s Time] [2022-11-20 20:33:34,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3253 states. [2022-11-20 20:33:34,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3253 to 3226. [2022-11-20 20:33:34,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3226 states, 3187 states have (on average 4.186695952306244) internal successors, (13343), 3225 states have internal predecessors, (13343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:33:34,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3226 states to 3226 states and 13343 transitions. [2022-11-20 20:33:34,561 INFO L78 Accepts]: Start accepts. Automaton has 3226 states and 13343 transitions. Word has length 12 [2022-11-20 20:33:34,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:33:34,561 INFO L495 AbstractCegarLoop]: Abstraction has 3226 states and 13343 transitions. [2022-11-20 20:33:34,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:33:34,562 INFO L276 IsEmpty]: Start isEmpty. Operand 3226 states and 13343 transitions. [2022-11-20 20:33:34,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:33:34,562 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:33:34,562 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:33:34,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2022-11-20 20:33:34,763 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:33:34,763 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:33:34,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:33:34,763 INFO L85 PathProgramCache]: Analyzing trace with hash -1902855292, now seen corresponding path program 1 times [2022-11-20 20:33:34,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:33:34,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1025964003] [2022-11-20 20:33:34,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:33:34,764 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:33:34,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:33:34,764 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:33:34,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (106)] Waiting until timeout for monitored process [2022-11-20 20:33:35,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:33:35,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:33:35,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:33:35,237 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:33:35,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:33:35,542 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:33:35,642 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:33:35,642 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:33:35,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1025964003] [2022-11-20 20:33:35,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1025964003] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:33:35,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2053124854] [2022-11-20 20:33:35,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:33:35,643 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:33:35,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:33:35,644 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:33:35,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (107)] Waiting until timeout for monitored process [2022-11-20 20:33:36,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:33:36,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:33:36,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:33:36,349 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:33:36,783 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:33:36,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:33:37,189 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:33:37,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2053124854] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:33:37,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177604596] [2022-11-20 20:33:37,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:33:37,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:33:37,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:33:37,191 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:33:37,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2022-11-20 20:33:37,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:33:37,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:33:37,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:33:37,542 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:33:38,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:33:38,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:33:38,629 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:33:38,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177604596] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:33:38,629 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:33:38,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 20:33:38,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441645437] [2022-11-20 20:33:38,630 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:33:38,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 20:33:38,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:33:38,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 20:33:38,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:33:38,631 INFO L87 Difference]: Start difference. First operand 3226 states and 13343 transitions. Second operand has 21 states, 20 states have (on average 2.2) internal successors, (44), 21 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) [2022-11-20 20:33:41,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:33:41,976 INFO L93 Difference]: Finished difference Result 3241 states and 13374 transitions. [2022-11-20 20:33:41,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 20:33:41,977 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.2) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:33:41,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:33:41,987 INFO L225 Difference]: With dead ends: 3241 [2022-11-20 20:33:41,987 INFO L226 Difference]: Without dead ends: 3241 [2022-11-20 20:33:41,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=172, Invalid=698, Unknown=0, NotChecked=0, Total=870 [2022-11-20 20:33:41,988 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 40 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 110 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:33:41,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 45 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 344 Invalid, 0 Unknown, 110 Unchecked, 2.3s Time] [2022-11-20 20:33:41,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3241 states. [2022-11-20 20:33:42,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3241 to 3232. [2022-11-20 20:33:42,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3232 states, 3193 states have (on average 4.182586908863138) internal successors, (13355), 3231 states have internal predecessors, (13355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:33:42,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3232 states to 3232 states and 13355 transitions. [2022-11-20 20:33:42,051 INFO L78 Accepts]: Start accepts. Automaton has 3232 states and 13355 transitions. Word has length 12 [2022-11-20 20:33:42,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:33:42,052 INFO L495 AbstractCegarLoop]: Abstraction has 3232 states and 13355 transitions. [2022-11-20 20:33:42,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.2) internal successors, (44), 21 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) [2022-11-20 20:33:42,052 INFO L276 IsEmpty]: Start isEmpty. Operand 3232 states and 13355 transitions. [2022-11-20 20:33:42,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:33:42,053 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:33:42,053 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:33:42,059 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (107)] Ended with exit code 0 [2022-11-20 20:33:42,265 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Forceful destruction successful, exit code 0 [2022-11-20 20:33:42,468 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (106)] Forceful destruction successful, exit code 0 [2022-11-20 20:33:42,660 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:33:42,660 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:33:42,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:33:42,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1903050592, now seen corresponding path program 2 times [2022-11-20 20:33:42,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:33:42,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1496483000] [2022-11-20 20:33:42,661 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:33:42,661 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:33:42,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:33:42,662 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:33:42,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (109)] Waiting until timeout for monitored process [2022-11-20 20:33:42,941 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:33:42,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:33:42,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:33:42,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:33:42,975 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:33:43,275 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:33:43,275 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:33:43,276 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:33:43,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1496483000] [2022-11-20 20:33:43,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1496483000] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:33:43,276 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:33:43,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:33:43,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694830280] [2022-11-20 20:33:43,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:33:43,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:33:43,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:33:43,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:33:43,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:33:43,277 INFO L87 Difference]: Start difference. First operand 3232 states and 13355 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:33:43,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:33:43,636 INFO L93 Difference]: Finished difference Result 3240 states and 13370 transitions. [2022-11-20 20:33:43,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:33:43,637 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:33:43,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:33:43,646 INFO L225 Difference]: With dead ends: 3240 [2022-11-20 20:33:43,646 INFO L226 Difference]: Without dead ends: 3240 [2022-11-20 20:33:43,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:33:43,647 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 8 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:33:43,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 16 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 0 Unknown, 35 Unchecked, 0.3s Time] [2022-11-20 20:33:43,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3240 states. [2022-11-20 20:33:43,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3240 to 3229. [2022-11-20 20:33:43,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3229 states, 3190 states have (on average 4.184326018808777) internal successors, (13348), 3228 states have internal predecessors, (13348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:33:43,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3229 states to 3229 states and 13348 transitions. [2022-11-20 20:33:43,755 INFO L78 Accepts]: Start accepts. Automaton has 3229 states and 13348 transitions. Word has length 12 [2022-11-20 20:33:43,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:33:43,755 INFO L495 AbstractCegarLoop]: Abstraction has 3229 states and 13348 transitions. [2022-11-20 20:33:43,755 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:33:43,755 INFO L276 IsEmpty]: Start isEmpty. Operand 3229 states and 13348 transitions. [2022-11-20 20:33:43,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:33:43,755 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:33:43,755 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:33:43,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (109)] Forceful destruction successful, exit code 0 [2022-11-20 20:33:43,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:33:43,956 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:33:43,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:33:43,956 INFO L85 PathProgramCache]: Analyzing trace with hash 811180208, now seen corresponding path program 1 times [2022-11-20 20:33:43,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:33:43,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1987222885] [2022-11-20 20:33:43,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:33:43,957 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:33:43,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:33:43,958 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:33:43,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2022-11-20 20:33:44,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:33:44,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:33:44,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:33:44,549 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:33:44,549 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:33:44,791 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:33:44,791 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:33:45,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:33:45,111 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 21 [2022-11-20 20:33:45,130 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:33:45,130 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:33:45,502 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:33:45,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:33:46,826 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:33:46,826 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:33:46,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1987222885] [2022-11-20 20:33:46,826 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1987222885] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:33:46,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [293294071] [2022-11-20 20:33:46,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:33:46,826 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:33:46,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:33:46,829 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:33:46,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (111)] Waiting until timeout for monitored process [2022-11-20 20:33:47,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:33:47,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-20 20:33:47,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:33:47,795 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:33:47,795 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:33:48,046 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:33:48,046 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:33:48,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:33:48,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:33:48,523 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:33:48,523 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:33:49,066 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:33:49,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:33:54,590 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:33:54,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [293294071] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:33:54,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161794122] [2022-11-20 20:33:54,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:33:54,591 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:33:54,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:33:54,592 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:33:54,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2022-11-20 20:33:54,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:33:54,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-20 20:33:54,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:33:55,175 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:33:55,175 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:33:55,701 INFO L321 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2022-11-20 20:33:55,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:33:56,414 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:33:56,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:34:00,968 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:34:00,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161794122] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:34:00,968 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:34:00,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 8, 8] total 30 [2022-11-20 20:34:00,969 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090491742] [2022-11-20 20:34:00,969 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:34:00,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-20 20:34:00,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:34:00,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-20 20:34:00,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=810, Unknown=1, NotChecked=0, Total=992 [2022-11-20 20:34:00,970 INFO L87 Difference]: Start difference. First operand 3229 states and 13348 transitions. Second operand has 32 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 31 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) [2022-11-20 20:34:30,804 WARN L233 SmtUtils]: Spent 28.68s on a formula simplification. DAG size of input: 64 DAG size of output: 63 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:34:41,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:34:41,651 INFO L93 Difference]: Finished difference Result 5607 states and 23668 transitions. [2022-11-20 20:34:41,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-20 20:34:41,654 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 31 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) Word has length 13 [2022-11-20 20:34:41,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:34:41,678 INFO L225 Difference]: With dead ends: 5607 [2022-11-20 20:34:41,678 INFO L226 Difference]: Without dead ends: 5607 [2022-11-20 20:34:41,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 46.8s TimeCoverageRelationStatistics Valid=405, Invalid=1664, Unknown=1, NotChecked=0, Total=2070 [2022-11-20 20:34:41,679 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 445 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 848 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 445 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 1503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 636 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:34:41,679 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [445 Valid, 165 Invalid, 1503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 848 Invalid, 0 Unknown, 636 Unchecked, 5.6s Time] [2022-11-20 20:34:41,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5607 states. [2022-11-20 20:34:41,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5607 to 4327. [2022-11-20 20:34:41,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4327 states, 4288 states have (on average 4.311800373134329) internal successors, (18489), 4326 states have internal predecessors, (18489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:34:41,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4327 states to 4327 states and 18489 transitions. [2022-11-20 20:34:41,843 INFO L78 Accepts]: Start accepts. Automaton has 4327 states and 18489 transitions. Word has length 13 [2022-11-20 20:34:41,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:34:41,843 INFO L495 AbstractCegarLoop]: Abstraction has 4327 states and 18489 transitions. [2022-11-20 20:34:41,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 31 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) [2022-11-20 20:34:41,843 INFO L276 IsEmpty]: Start isEmpty. Operand 4327 states and 18489 transitions. [2022-11-20 20:34:41,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:34:41,844 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:34:41,844 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:34:41,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (111)] Forceful destruction successful, exit code 0 [2022-11-20 20:34:42,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (110)] Forceful destruction successful, exit code 0 [2022-11-20 20:34:42,251 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Ended with exit code 0 [2022-11-20 20:34:42,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:34:42,445 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:34:42,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:34:42,446 INFO L85 PathProgramCache]: Analyzing trace with hash 810974934, now seen corresponding path program 1 times [2022-11-20 20:34:42,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:34:42,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [465175694] [2022-11-20 20:34:42,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:34:42,446 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:34:42,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:34:42,447 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:34:42,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2022-11-20 20:34:42,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:34:42,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:34:42,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:34:43,110 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:34:43,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:34:43,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 20:34:43,869 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:34:43,869 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:34:43,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [465175694] [2022-11-20 20:34:43,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [465175694] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:34:43,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1998972618] [2022-11-20 20:34:43,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:34:43,869 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:34:43,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:34:43,870 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:34:43,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2022-11-20 20:34:44,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:34:44,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:34:44,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:34:44,893 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:34:45,495 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:34:45,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:34:46,193 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:34:46,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1998972618] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:34:46,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577704604] [2022-11-20 20:34:46,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:34:46,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:34:46,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:34:46,195 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:34:46,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2022-11-20 20:34:46,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:34:46,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:34:46,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:34:46,717 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:34:47,393 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:34:47,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:34:48,483 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:34:48,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577704604] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:34:48,484 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:34:48,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 30 [2022-11-20 20:34:48,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856025283] [2022-11-20 20:34:48,484 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:34:48,485 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-20 20:34:48,485 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:34:48,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-20 20:34:48,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2022-11-20 20:34:48,485 INFO L87 Difference]: Start difference. First operand 4327 states and 18489 transitions. Second operand has 31 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 31 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:34:58,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:34:58,608 INFO L93 Difference]: Finished difference Result 4903 states and 20323 transitions. [2022-11-20 20:34:58,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-20 20:34:58,609 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 31 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:34:58,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:34:58,622 INFO L225 Difference]: With dead ends: 4903 [2022-11-20 20:34:58,623 INFO L226 Difference]: Without dead ends: 4903 [2022-11-20 20:34:58,623 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=358, Invalid=1898, Unknown=0, NotChecked=0, Total=2256 [2022-11-20 20:34:58,623 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 259 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 208 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:34:58,623 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 106 Invalid, 912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 647 Invalid, 0 Unknown, 208 Unchecked, 6.3s Time] [2022-11-20 20:34:58,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4903 states. [2022-11-20 20:34:58,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4903 to 4415. [2022-11-20 20:34:58,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4415 states, 4376 states have (on average 4.311014625228519) internal successors, (18865), 4414 states have internal predecessors, (18865), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:34:58,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4415 states to 4415 states and 18865 transitions. [2022-11-20 20:34:58,746 INFO L78 Accepts]: Start accepts. Automaton has 4415 states and 18865 transitions. Word has length 13 [2022-11-20 20:34:58,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:34:58,746 INFO L495 AbstractCegarLoop]: Abstraction has 4415 states and 18865 transitions. [2022-11-20 20:34:58,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 31 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:34:58,747 INFO L276 IsEmpty]: Start isEmpty. Operand 4415 states and 18865 transitions. [2022-11-20 20:34:58,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:34:58,747 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:34:58,748 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:34:58,766 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (113)] Ended with exit code 0 [2022-11-20 20:34:58,967 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2022-11-20 20:34:59,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (114)] Forceful destruction successful, exit code 0 [2022-11-20 20:34:59,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:34:59,362 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:34:59,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:34:59,362 INFO L85 PathProgramCache]: Analyzing trace with hash 809533434, now seen corresponding path program 2 times [2022-11-20 20:34:59,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:34:59,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1958890663] [2022-11-20 20:34:59,363 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:34:59,363 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:34:59,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:34:59,364 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:34:59,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2022-11-20 20:34:59,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:34:59,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:34:59,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:34:59,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:34:59,889 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:34:59,889 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:34:59,980 INFO L321 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2022-11-20 20:34:59,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:35:00,250 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-20 20:35:00,250 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:35:00,250 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:35:00,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1958890663] [2022-11-20 20:35:00,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1958890663] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:35:00,250 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:35:00,250 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:35:00,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450322508] [2022-11-20 20:35:00,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:35:00,251 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:35:00,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:35:00,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:35:00,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:35:00,252 INFO L87 Difference]: Start difference. First operand 4415 states and 18865 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:35:00,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:35:00,571 INFO L93 Difference]: Finished difference Result 4404 states and 18779 transitions. [2022-11-20 20:35:00,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:35:00,572 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:35:00,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:35:00,584 INFO L225 Difference]: With dead ends: 4404 [2022-11-20 20:35:00,584 INFO L226 Difference]: Without dead ends: 4404 [2022-11-20 20:35:00,584 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:35:00,585 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:35:00,585 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 12 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 59 Unchecked, 0.2s Time] [2022-11-20 20:35:00,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4404 states. [2022-11-20 20:35:00,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4404 to 4404. [2022-11-20 20:35:00,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4404 states, 4365 states have (on average 4.302176403207331) internal successors, (18779), 4403 states have internal predecessors, (18779), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:35:00,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4404 states to 4404 states and 18779 transitions. [2022-11-20 20:35:00,705 INFO L78 Accepts]: Start accepts. Automaton has 4404 states and 18779 transitions. Word has length 13 [2022-11-20 20:35:00,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:35:00,706 INFO L495 AbstractCegarLoop]: Abstraction has 4404 states and 18779 transitions. [2022-11-20 20:35:00,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:35:00,706 INFO L276 IsEmpty]: Start isEmpty. Operand 4404 states and 18779 transitions. [2022-11-20 20:35:00,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:35:00,706 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:35:00,706 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:35:00,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (116)] Forceful destruction successful, exit code 0 [2022-11-20 20:35:00,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:35:00,907 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:35:00,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:35:00,907 INFO L85 PathProgramCache]: Analyzing trace with hash 1325663084, now seen corresponding path program 1 times [2022-11-20 20:35:00,907 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:35:00,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1110024096] [2022-11-20 20:35:00,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:35:00,908 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:35:00,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:35:00,909 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:35:00,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (117)] Waiting until timeout for monitored process [2022-11-20 20:35:01,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:35:01,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:35:01,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:01,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:01,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:35:01,826 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:35:01,925 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:01,925 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:35:01,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1110024096] [2022-11-20 20:35:01,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1110024096] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:35:01,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2037631732] [2022-11-20 20:35:01,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:35:01,926 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:35:01,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:35:01,927 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:35:01,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (118)] Waiting until timeout for monitored process [2022-11-20 20:35:02,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:35:02,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:35:02,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:02,688 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:35:03,157 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:03,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:35:03,568 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:03,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2037631732] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:35:03,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908924730] [2022-11-20 20:35:03,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:35:03,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:35:03,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:35:03,569 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:35:03,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2022-11-20 20:35:03,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:35:03,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:35:03,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:03,934 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:35:04,415 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:04,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:35:05,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:05,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908924730] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:35:05,019 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:35:05,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 20:35:05,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134062979] [2022-11-20 20:35:05,020 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:35:05,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 20:35:05,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:35:05,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 20:35:05,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:35:05,021 INFO L87 Difference]: Start difference. First operand 4404 states and 18779 transitions. Second operand has 21 states, 20 states have (on average 2.35) internal successors, (47), 21 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) [2022-11-20 20:35:08,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:35:08,513 INFO L93 Difference]: Finished difference Result 4436 states and 18854 transitions. [2022-11-20 20:35:08,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-20 20:35:08,514 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.35) internal successors, (47), 21 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) Word has length 13 [2022-11-20 20:35:08,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:35:08,527 INFO L225 Difference]: With dead ends: 4436 [2022-11-20 20:35:08,527 INFO L226 Difference]: Without dead ends: 4436 [2022-11-20 20:35:08,527 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2022-11-20 20:35:08,528 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 58 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:35:08,528 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 45 Invalid, 450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 308 Invalid, 0 Unknown, 112 Unchecked, 2.2s Time] [2022-11-20 20:35:08,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4436 states. [2022-11-20 20:35:08,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4436 to 4410. [2022-11-20 20:35:08,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4410 states, 4371 states have (on average 4.299016243422558) internal successors, (18791), 4409 states have internal predecessors, (18791), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:35:08,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4410 states to 4410 states and 18791 transitions. [2022-11-20 20:35:08,653 INFO L78 Accepts]: Start accepts. Automaton has 4410 states and 18791 transitions. Word has length 13 [2022-11-20 20:35:08,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:35:08,653 INFO L495 AbstractCegarLoop]: Abstraction has 4410 states and 18791 transitions. [2022-11-20 20:35:08,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.35) internal successors, (47), 21 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) [2022-11-20 20:35:08,653 INFO L276 IsEmpty]: Start isEmpty. Operand 4410 states and 18791 transitions. [2022-11-20 20:35:08,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:35:08,654 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:35:08,654 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:35:08,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (118)] Forceful destruction successful, exit code 0 [2022-11-20 20:35:08,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Forceful destruction successful, exit code 0 [2022-11-20 20:35:09,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (117)] Forceful destruction successful, exit code 0 [2022-11-20 20:35:09,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:35:09,256 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:35:09,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:35:09,256 INFO L85 PathProgramCache]: Analyzing trace with hash 1325467784, now seen corresponding path program 2 times [2022-11-20 20:35:09,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:35:09,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1030831865] [2022-11-20 20:35:09,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:35:09,257 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:35:09,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:35:09,258 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:35:09,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (120)] Waiting until timeout for monitored process [2022-11-20 20:35:09,575 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:35:09,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:35:09,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:35:09,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:09,607 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:35:09,913 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:35:09,913 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:35:09,913 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:35:09,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1030831865] [2022-11-20 20:35:09,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1030831865] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:35:09,914 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:35:09,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:35:09,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076231041] [2022-11-20 20:35:09,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:35:09,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:35:09,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:35:09,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:35:09,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:35:09,915 INFO L87 Difference]: Start difference. First operand 4410 states and 18791 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:35:10,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:35:10,262 INFO L93 Difference]: Finished difference Result 4434 states and 18852 transitions. [2022-11-20 20:35:10,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:35:10,263 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:35:10,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:35:10,277 INFO L225 Difference]: With dead ends: 4434 [2022-11-20 20:35:10,277 INFO L226 Difference]: Without dead ends: 4434 [2022-11-20 20:35:10,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:35:10,277 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 11 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:35:10,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 12 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 43 Unchecked, 0.3s Time] [2022-11-20 20:35:10,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4434 states. [2022-11-20 20:35:10,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4434 to 4411. [2022-11-20 20:35:10,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4411 states, 4372 states have (on average 4.299405306495883) internal successors, (18797), 4410 states have internal predecessors, (18797), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:35:10,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4411 states to 4411 states and 18797 transitions. [2022-11-20 20:35:10,405 INFO L78 Accepts]: Start accepts. Automaton has 4411 states and 18797 transitions. Word has length 13 [2022-11-20 20:35:10,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:35:10,406 INFO L495 AbstractCegarLoop]: Abstraction has 4411 states and 18797 transitions. [2022-11-20 20:35:10,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:35:10,406 INFO L276 IsEmpty]: Start isEmpty. Operand 4411 states and 18797 transitions. [2022-11-20 20:35:10,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:35:10,406 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:35:10,407 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:35:10,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (120)] Forceful destruction successful, exit code 0 [2022-11-20 20:35:10,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:35:10,607 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:35:10,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:35:10,607 INFO L85 PathProgramCache]: Analyzing trace with hash 1325066675, now seen corresponding path program 1 times [2022-11-20 20:35:10,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:35:10,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [312286009] [2022-11-20 20:35:10,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:35:10,608 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:35:10,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:35:10,609 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:35:10,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (121)] Waiting until timeout for monitored process [2022-11-20 20:35:10,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:35:10,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:35:10,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:11,151 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:11,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:35:11,518 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:35:11,640 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:11,640 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:35:11,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [312286009] [2022-11-20 20:35:11,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [312286009] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:35:11,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1538389971] [2022-11-20 20:35:11,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:35:11,640 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:35:11,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:35:11,641 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:35:11,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (122)] Waiting until timeout for monitored process [2022-11-20 20:35:12,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:35:12,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:35:12,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:12,400 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:35:12,874 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:12,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:35:13,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:13,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1538389971] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:35:13,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570893435] [2022-11-20 20:35:13,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:35:13,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:35:13,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:35:13,319 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:35:13,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2022-11-20 20:35:13,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:35:13,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:35:13,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:13,697 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:35:14,160 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:14,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:35:14,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:14,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1570893435] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:35:14,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:35:14,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 20:35:14,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63010004] [2022-11-20 20:35:14,840 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:35:14,841 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 20:35:14,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:35:14,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 20:35:14,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:35:14,841 INFO L87 Difference]: Start difference. First operand 4411 states and 18797 transitions. Second operand has 21 states, 20 states have (on average 2.35) internal successors, (47), 21 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) [2022-11-20 20:35:19,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:35:19,832 INFO L93 Difference]: Finished difference Result 4611 states and 19496 transitions. [2022-11-20 20:35:19,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 20:35:19,833 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.35) internal successors, (47), 21 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) Word has length 13 [2022-11-20 20:35:19,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:35:19,848 INFO L225 Difference]: With dead ends: 4611 [2022-11-20 20:35:19,848 INFO L226 Difference]: Without dead ends: 4611 [2022-11-20 20:35:19,849 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=173, Invalid=819, Unknown=0, NotChecked=0, Total=992 [2022-11-20 20:35:19,849 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 45 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:35:19,850 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 48 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 320 Invalid, 0 Unknown, 103 Unchecked, 3.1s Time] [2022-11-20 20:35:19,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4611 states. [2022-11-20 20:35:19,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4611 to 4547. [2022-11-20 20:35:19,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4547 states, 4508 states have (on average 4.2939219165927245) internal successors, (19357), 4546 states have internal predecessors, (19357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:35:19,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4547 states to 4547 states and 19357 transitions. [2022-11-20 20:35:19,953 INFO L78 Accepts]: Start accepts. Automaton has 4547 states and 19357 transitions. Word has length 13 [2022-11-20 20:35:19,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:35:19,953 INFO L495 AbstractCegarLoop]: Abstraction has 4547 states and 19357 transitions. [2022-11-20 20:35:19,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.35) internal successors, (47), 21 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) [2022-11-20 20:35:19,953 INFO L276 IsEmpty]: Start isEmpty. Operand 4547 states and 19357 transitions. [2022-11-20 20:35:19,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:35:19,954 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:35:19,954 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:35:19,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (121)] Forceful destruction successful, exit code 0 [2022-11-20 20:35:20,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Forceful destruction successful, exit code 0 [2022-11-20 20:35:20,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (122)] Forceful destruction successful, exit code 0 [2022-11-20 20:35:20,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:35:20,555 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:35:20,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:35:20,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1326635544, now seen corresponding path program 1 times [2022-11-20 20:35:20,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:35:20,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1585513073] [2022-11-20 20:35:20,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:35:20,556 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:35:20,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:35:20,556 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:35:20,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (124)] Waiting until timeout for monitored process [2022-11-20 20:35:20,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:35:20,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:35:20,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:21,177 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:35:21,177 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:35:21,413 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:35:21,413 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:35:21,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:35:21,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:35:21,708 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:35:21,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:35:22,153 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:22,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:35:28,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:28,571 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:35:28,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1585513073] [2022-11-20 20:35:28,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1585513073] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:35:28,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2039790318] [2022-11-20 20:35:28,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:35:28,572 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:35:28,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:35:28,573 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:35:28,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (125)] Waiting until timeout for monitored process [2022-11-20 20:35:29,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:35:29,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 20:35:29,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:29,622 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:35:29,623 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:35:29,906 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:35:29,906 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:35:30,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:35:30,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:35:30,356 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:35:30,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:35:31,197 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:31,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:35:42,725 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:35:42,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2039790318] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:35:42,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113808597] [2022-11-20 20:35:42,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:35:42,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:35:42,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:35:42,727 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:35:42,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2022-11-20 20:35:43,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:35:43,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 20:35:43,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:35:43,361 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:35:43,361 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:35:43,789 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-20 20:35:43,789 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 22 [2022-11-20 20:35:44,986 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:35:44,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:35:54,588 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:35:54,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113808597] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:35:54,588 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:35:54,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 29 [2022-11-20 20:35:54,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414587038] [2022-11-20 20:35:54,588 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:35:54,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-20 20:35:54,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:35:54,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-20 20:35:54,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=776, Unknown=3, NotChecked=0, Total=930 [2022-11-20 20:35:54,589 INFO L87 Difference]: Start difference. First operand 4547 states and 19357 transitions. Second operand has 31 states, 30 states have (on average 2.3) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:17,886 WARN L233 SmtUtils]: Spent 18.00s on a formula simplification. DAG size of input: 55 DAG size of output: 43 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 20:36:19,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:36:19,336 INFO L93 Difference]: Finished difference Result 5539 states and 22776 transitions. [2022-11-20 20:36:19,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 20:36:19,338 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.3) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:36:19,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:36:19,387 INFO L225 Difference]: With dead ends: 5539 [2022-11-20 20:36:19,388 INFO L226 Difference]: Without dead ends: 5539 [2022-11-20 20:36:19,388 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 51.2s TimeCoverageRelationStatistics Valid=186, Invalid=931, Unknown=5, NotChecked=0, Total=1122 [2022-11-20 20:36:19,388 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 53 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 311 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:36:19,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 72 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 143 Invalid, 0 Unknown, 311 Unchecked, 1.1s Time] [2022-11-20 20:36:19,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5539 states. [2022-11-20 20:36:19,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5539 to 4588. [2022-11-20 20:36:19,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4588 states, 4549 states have (on average 4.298746977357661) internal successors, (19555), 4587 states have internal predecessors, (19555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:19,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4588 states to 4588 states and 19555 transitions. [2022-11-20 20:36:19,494 INFO L78 Accepts]: Start accepts. Automaton has 4588 states and 19555 transitions. Word has length 13 [2022-11-20 20:36:19,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:36:19,495 INFO L495 AbstractCegarLoop]: Abstraction has 4588 states and 19555 transitions. [2022-11-20 20:36:19,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 2.3) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:19,495 INFO L276 IsEmpty]: Start isEmpty. Operand 4588 states and 19555 transitions. [2022-11-20 20:36:19,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:36:19,496 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:36:19,496 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:36:19,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (124)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:19,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (125)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:19,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:20,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:36:20,100 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:36:20,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:36:20,100 INFO L85 PathProgramCache]: Analyzing trace with hash 1326634655, now seen corresponding path program 2 times [2022-11-20 20:36:20,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:36:20,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [162250986] [2022-11-20 20:36:20,101 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:36:20,101 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:20,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:36:20,101 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:36:20,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (127)] Waiting until timeout for monitored process [2022-11-20 20:36:20,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:36:20,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:36:20,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:36:20,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:20,448 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:36:20,762 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:36:20,762 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:36:20,762 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:36:20,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [162250986] [2022-11-20 20:36:20,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [162250986] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:36:20,762 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:36:20,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:36:20,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051248941] [2022-11-20 20:36:20,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:36:20,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:36:20,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:36:20,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:36:20,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:36:20,763 INFO L87 Difference]: Start difference. First operand 4588 states and 19555 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:21,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:36:21,066 INFO L93 Difference]: Finished difference Result 4721 states and 20388 transitions. [2022-11-20 20:36:21,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:36:21,067 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:36:21,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:36:21,079 INFO L225 Difference]: With dead ends: 4721 [2022-11-20 20:36:21,079 INFO L226 Difference]: Without dead ends: 4721 [2022-11-20 20:36:21,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:36:21,080 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 11 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:36:21,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 20 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 41 Unchecked, 0.2s Time] [2022-11-20 20:36:21,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4721 states. [2022-11-20 20:36:21,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4721 to 4638. [2022-11-20 20:36:21,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4638 states, 4599 states have (on average 4.314198738856273) internal successors, (19841), 4637 states have internal predecessors, (19841), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:21,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4638 states to 4638 states and 19841 transitions. [2022-11-20 20:36:21,204 INFO L78 Accepts]: Start accepts. Automaton has 4638 states and 19841 transitions. Word has length 13 [2022-11-20 20:36:21,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:36:21,204 INFO L495 AbstractCegarLoop]: Abstraction has 4638 states and 19841 transitions. [2022-11-20 20:36:21,204 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:21,204 INFO L276 IsEmpty]: Start isEmpty. Operand 4638 states and 19841 transitions. [2022-11-20 20:36:21,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:36:21,205 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:36:21,205 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:36:21,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (127)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:21,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:21,412 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:36:21,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:36:21,412 INFO L85 PathProgramCache]: Analyzing trace with hash 1326479304, now seen corresponding path program 2 times [2022-11-20 20:36:21,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:36:21,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1397746907] [2022-11-20 20:36:21,412 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:36:21,413 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:21,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:36:21,414 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:36:21,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (128)] Waiting until timeout for monitored process [2022-11-20 20:36:21,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 20:36:21,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:36:21,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:36:21,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:21,998 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:36:21,999 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:36:22,224 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:36:22,225 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:36:22,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:36:22,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-20 20:36:22,362 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:36:22,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:36:22,781 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:36:22,781 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:36:22,782 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:36:22,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1397746907] [2022-11-20 20:36:22,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1397746907] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:36:22,782 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:36:22,782 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:36:22,782 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764371464] [2022-11-20 20:36:22,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:36:22,782 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:36:22,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:36:22,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:36:22,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:36:22,783 INFO L87 Difference]: Start difference. First operand 4638 states and 19841 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:23,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:36:23,691 INFO L93 Difference]: Finished difference Result 6002 states and 25414 transitions. [2022-11-20 20:36:23,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:36:23,692 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:36:23,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:36:23,714 INFO L225 Difference]: With dead ends: 6002 [2022-11-20 20:36:23,714 INFO L226 Difference]: Without dead ends: 6002 [2022-11-20 20:36:23,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:36:23,714 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 121 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-20 20:36:23,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 6 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-20 20:36:23,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6002 states. [2022-11-20 20:36:23,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6002 to 4950. [2022-11-20 20:36:23,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4950 states, 4911 states have (on average 4.312360008144981) internal successors, (21178), 4949 states have internal predecessors, (21178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:23,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4950 states to 4950 states and 21178 transitions. [2022-11-20 20:36:23,886 INFO L78 Accepts]: Start accepts. Automaton has 4950 states and 21178 transitions. Word has length 13 [2022-11-20 20:36:23,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:36:23,886 INFO L495 AbstractCegarLoop]: Abstraction has 4950 states and 21178 transitions. [2022-11-20 20:36:23,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:23,886 INFO L276 IsEmpty]: Start isEmpty. Operand 4950 states and 21178 transitions. [2022-11-20 20:36:23,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:36:23,887 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:36:23,887 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:36:23,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (128)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:24,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:24,091 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:36:24,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:36:24,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1326450515, now seen corresponding path program 3 times [2022-11-20 20:36:24,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:36:24,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [924500546] [2022-11-20 20:36:24,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:36:24,092 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:24,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:36:24,094 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:36:24,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (129)] Waiting until timeout for monitored process [2022-11-20 20:36:24,423 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-20 20:36:24,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:36:24,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:36:24,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:24,462 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:36:24,770 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:36:24,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:36:24,771 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:36:24,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [924500546] [2022-11-20 20:36:24,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [924500546] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:36:24,771 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:36:24,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:36:24,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466962024] [2022-11-20 20:36:24,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:36:24,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:36:24,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:36:24,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:36:24,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:36:24,773 INFO L87 Difference]: Start difference. First operand 4950 states and 21178 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:25,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:36:25,086 INFO L93 Difference]: Finished difference Result 4958 states and 21187 transitions. [2022-11-20 20:36:25,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:36:25,086 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:36:25,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:36:25,148 INFO L225 Difference]: With dead ends: 4958 [2022-11-20 20:36:25,148 INFO L226 Difference]: Without dead ends: 4958 [2022-11-20 20:36:25,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:36:25,148 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 11 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:36:25,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 20 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 55 Invalid, 0 Unknown, 39 Unchecked, 0.2s Time] [2022-11-20 20:36:25,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4958 states. [2022-11-20 20:36:25,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4958 to 4902. [2022-11-20 20:36:25,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4902 states, 4863 states have (on average 4.309479745013366) internal successors, (20957), 4901 states have internal predecessors, (20957), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:25,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4902 states to 4902 states and 20957 transitions. [2022-11-20 20:36:25,245 INFO L78 Accepts]: Start accepts. Automaton has 4902 states and 20957 transitions. Word has length 13 [2022-11-20 20:36:25,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:36:25,245 INFO L495 AbstractCegarLoop]: Abstraction has 4902 states and 20957 transitions. [2022-11-20 20:36:25,245 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:25,245 INFO L276 IsEmpty]: Start isEmpty. Operand 4902 states and 20957 transitions. [2022-11-20 20:36:25,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:36:25,246 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:36:25,246 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:36:25,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (129)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:25,447 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:25,447 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:36:25,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:36:25,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1141032044, now seen corresponding path program 3 times [2022-11-20 20:36:25,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:36:25,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [390362555] [2022-11-20 20:36:25,448 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:36:25,448 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:25,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:36:25,449 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:36:25,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (130)] Waiting until timeout for monitored process [2022-11-20 20:36:25,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-20 20:36:25,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:36:25,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:36:25,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:25,806 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:36:26,118 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:36:26,118 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:36:26,118 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:36:26,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [390362555] [2022-11-20 20:36:26,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [390362555] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:36:26,119 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:36:26,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:36:26,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968784464] [2022-11-20 20:36:26,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:36:26,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:36:26,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:36:26,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:36:26,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:36:26,120 INFO L87 Difference]: Start difference. First operand 4902 states and 20957 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:26,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:36:26,456 INFO L93 Difference]: Finished difference Result 5114 states and 21556 transitions. [2022-11-20 20:36:26,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:36:26,457 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:36:26,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:36:26,522 INFO L225 Difference]: With dead ends: 5114 [2022-11-20 20:36:26,523 INFO L226 Difference]: Without dead ends: 5114 [2022-11-20 20:36:26,523 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:36:26,523 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 22 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:36:26,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 16 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 49 Invalid, 0 Unknown, 89 Unchecked, 0.3s Time] [2022-11-20 20:36:26,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5114 states. [2022-11-20 20:36:26,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5114 to 4903. [2022-11-20 20:36:26,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4903 states, 4864 states have (on average 4.3090049342105265) internal successors, (20959), 4902 states have internal predecessors, (20959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:26,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4903 states to 4903 states and 20959 transitions. [2022-11-20 20:36:26,620 INFO L78 Accepts]: Start accepts. Automaton has 4903 states and 20959 transitions. Word has length 13 [2022-11-20 20:36:26,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:36:26,621 INFO L495 AbstractCegarLoop]: Abstraction has 4903 states and 20959 transitions. [2022-11-20 20:36:26,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:26,621 INFO L276 IsEmpty]: Start isEmpty. Operand 4903 states and 20959 transitions. [2022-11-20 20:36:26,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:36:26,622 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:36:26,622 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:36:26,631 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (130)] Ended with exit code 0 [2022-11-20 20:36:26,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:26,823 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:36:26,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:36:26,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1134977744, now seen corresponding path program 4 times [2022-11-20 20:36:26,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:36:26,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1449848676] [2022-11-20 20:36:26,823 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:36:26,823 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:26,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:36:26,825 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:36:26,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (131)] Waiting until timeout for monitored process [2022-11-20 20:36:27,175 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:36:27,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:36:27,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:36:27,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:27,393 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:36:27,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:36:27,783 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:36:27,891 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:36:27,891 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:36:27,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1449848676] [2022-11-20 20:36:27,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1449848676] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:36:27,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1158733088] [2022-11-20 20:36:27,891 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:36:27,891 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:36:27,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:36:27,892 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:36:27,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (132)] Waiting until timeout for monitored process [2022-11-20 20:36:28,532 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:36:28,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:36:28,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:36:28,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:28,694 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:36:29,187 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:36:29,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:36:29,643 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:36:29,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1158733088] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:36:29,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571523169] [2022-11-20 20:36:29,644 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:36:29,644 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:36:29,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:36:29,645 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:36:29,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Waiting until timeout for monitored process [2022-11-20 20:36:30,037 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:36:30,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:36:30,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:36:30,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:30,053 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:36:30,535 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:36:30,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:36:31,185 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:36:31,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571523169] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:36:31,185 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:36:31,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 20:36:31,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126402701] [2022-11-20 20:36:31,186 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:36:31,186 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 20:36:31,186 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:36:31,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 20:36:31,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-20 20:36:31,187 INFO L87 Difference]: Start difference. First operand 4903 states and 20959 transitions. Second operand has 21 states, 20 states have (on average 2.35) internal successors, (47), 21 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) [2022-11-20 20:36:34,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:36:34,821 INFO L93 Difference]: Finished difference Result 5059 states and 21428 transitions. [2022-11-20 20:36:34,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-20 20:36:34,822 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.35) internal successors, (47), 21 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) Word has length 13 [2022-11-20 20:36:34,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:36:34,834 INFO L225 Difference]: With dead ends: 5059 [2022-11-20 20:36:34,835 INFO L226 Difference]: Without dead ends: 5059 [2022-11-20 20:36:34,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=178, Invalid=752, Unknown=0, NotChecked=0, Total=930 [2022-11-20 20:36:34,835 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 50 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 154 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:36:34,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 52 Invalid, 523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 337 Invalid, 0 Unknown, 154 Unchecked, 2.3s Time] [2022-11-20 20:36:34,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5059 states. [2022-11-20 20:36:34,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5059 to 4831. [2022-11-20 20:36:34,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4831 states, 4792 states have (on average 4.309474123539232) internal successors, (20651), 4830 states have internal predecessors, (20651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:34,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4831 states to 4831 states and 20651 transitions. [2022-11-20 20:36:34,920 INFO L78 Accepts]: Start accepts. Automaton has 4831 states and 20651 transitions. Word has length 13 [2022-11-20 20:36:34,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:36:34,921 INFO L495 AbstractCegarLoop]: Abstraction has 4831 states and 20651 transitions. [2022-11-20 20:36:34,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.35) internal successors, (47), 21 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) [2022-11-20 20:36:34,921 INFO L276 IsEmpty]: Start isEmpty. Operand 4831 states and 20651 transitions. [2022-11-20 20:36:34,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 20:36:34,922 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:36:34,922 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:36:34,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:35,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (131)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:35,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (132)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:35,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:36:35,523 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:36:35,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:36:35,524 INFO L85 PathProgramCache]: Analyzing trace with hash -623226830, now seen corresponding path program 1 times [2022-11-20 20:36:35,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:36:35,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [971832588] [2022-11-20 20:36:35,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:36:35,524 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:35,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:36:35,525 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:36:35,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (134)] Waiting until timeout for monitored process [2022-11-20 20:36:35,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:36:35,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:36:35,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:36,168 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:36,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:36:36,666 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 20:36:36,950 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:36,951 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:36:36,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [971832588] [2022-11-20 20:36:36,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [971832588] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:36:36,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [17134303] [2022-11-20 20:36:36,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:36:36,951 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:36:36,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:36:36,952 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:36:36,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (135)] Waiting until timeout for monitored process [2022-11-20 20:36:37,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:36:37,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:36:37,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:38,001 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:36:38,591 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:38,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:36:39,335 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:39,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [17134303] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:36:39,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636872574] [2022-11-20 20:36:39,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:36:39,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:36:39,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:36:39,337 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:36:39,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Waiting until timeout for monitored process [2022-11-20 20:36:39,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:36:39,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:36:39,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:39,885 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 20:36:40,535 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:40,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:36:41,582 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:41,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636872574] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:36:41,582 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:36:41,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 30 [2022-11-20 20:36:41,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931922156] [2022-11-20 20:36:41,582 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:36:41,582 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-20 20:36:41,582 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:36:41,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-20 20:36:41,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2022-11-20 20:36:41,583 INFO L87 Difference]: Start difference. First operand 4831 states and 20651 transitions. Second operand has 31 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 31 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:47,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:36:47,488 INFO L93 Difference]: Finished difference Result 5337 states and 22248 transitions. [2022-11-20 20:36:47,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-20 20:36:47,490 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 31 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 20:36:47,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:36:47,507 INFO L225 Difference]: With dead ends: 5337 [2022-11-20 20:36:47,507 INFO L226 Difference]: Without dead ends: 5337 [2022-11-20 20:36:47,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=359, Invalid=1803, Unknown=0, NotChecked=0, Total=2162 [2022-11-20 20:36:47,508 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 170 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 692 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 1050 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 315 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:36:47,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 141 Invalid, 1050 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 692 Invalid, 0 Unknown, 315 Unchecked, 3.5s Time] [2022-11-20 20:36:47,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5337 states. [2022-11-20 20:36:47,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5337 to 4846. [2022-11-20 20:36:47,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4846 states, 4807 states have (on average 4.309964634907427) internal successors, (20718), 4845 states have internal predecessors, (20718), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:47,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4846 states to 4846 states and 20718 transitions. [2022-11-20 20:36:47,643 INFO L78 Accepts]: Start accepts. Automaton has 4846 states and 20718 transitions. Word has length 14 [2022-11-20 20:36:47,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:36:47,644 INFO L495 AbstractCegarLoop]: Abstraction has 4846 states and 20718 transitions. [2022-11-20 20:36:47,644 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 31 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:36:47,644 INFO L276 IsEmpty]: Start isEmpty. Operand 4846 states and 20718 transitions. [2022-11-20 20:36:47,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 20:36:47,645 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:36:47,645 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:36:47,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (134)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:47,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (135)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:48,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Forceful destruction successful, exit code 0 [2022-11-20 20:36:48,260 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:36:48,260 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2022-11-20 20:36:48,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:36:48,260 INFO L85 PathProgramCache]: Analyzing trace with hash -623187809, now seen corresponding path program 1 times [2022-11-20 20:36:48,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:36:48,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1041222892] [2022-11-20 20:36:48,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:36:48,261 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:36:48,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:36:48,262 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:36:48,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (137)] Waiting until timeout for monitored process [2022-11-20 20:36:48,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:36:48,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:36:48,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:48,958 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:36:48,958 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:36:49,177 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:36:49,177 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:36:49,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:36:49,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 21 [2022-11-20 20:36:49,463 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:36:49,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:36:49,834 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:49,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:36:51,236 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:51,236 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:36:51,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1041222892] [2022-11-20 20:36:51,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1041222892] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:36:51,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [891209431] [2022-11-20 20:36:51,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:36:51,237 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:36:51,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:36:51,238 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:36:51,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (138)] Waiting until timeout for monitored process [2022-11-20 20:36:52,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:36:52,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-20 20:36:52,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:52,317 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:36:52,317 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:36:52,545 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 20:36:52,546 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 20:36:53,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:36:53,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:36:53,049 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-20 20:36:53,050 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-20 20:36:53,694 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:53,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:36:55,618 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:36:55,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [891209431] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:36:55,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181355153] [2022-11-20 20:36:55,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:36:55,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:36:55,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:36:55,620 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:36:55,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_62cb05c5-b8a4-4469-b722-37c136925c0f/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (139)] Waiting until timeout for monitored process [2022-11-20 20:36:56,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:36:56,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-20 20:36:56,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:36:56,315 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:36:56,315 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:36:56,828 INFO L321 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2022-11-20 20:36:56,828 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 20:36:57,579 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:36:57,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:37:01,150 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:37:01,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181355153] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:37:01,150 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:37:01,151 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 8, 8] total 30 [2022-11-20 20:37:01,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556671806] [2022-11-20 20:37:01,151 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:37:01,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-20 20:37:01,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:37:01,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-20 20:37:01,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=811, Unknown=0, NotChecked=0, Total=992 [2022-11-20 20:37:01,152 INFO L87 Difference]: Start difference. First operand 4846 states and 20718 transitions. Second operand has 32 states, 31 states have (on average 1.8387096774193548) internal successors, (57), 31 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:37:31,186 WARN L233 SmtUtils]: Spent 28.66s on a formula simplification. DAG size of input: 64 DAG size of output: 63 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)