./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/verifythis/tree_max.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version 2329fc70 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_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/tree_max.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/config/svcomp-MemCleanup-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c --- 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-2329fc7 [2022-12-14 13:32:10,698 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 13:32:10,700 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 13:32:10,719 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 13:32:10,719 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 13:32:10,720 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 13:32:10,721 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 13:32:10,723 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 13:32:10,724 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 13:32:10,725 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 13:32:10,726 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 13:32:10,727 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 13:32:10,727 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 13:32:10,728 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 13:32:10,729 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 13:32:10,730 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 13:32:10,731 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 13:32:10,732 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 13:32:10,733 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 13:32:10,735 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 13:32:10,736 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 13:32:10,737 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 13:32:10,738 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 13:32:10,739 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 13:32:10,742 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 13:32:10,742 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 13:32:10,743 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 13:32:10,743 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 13:32:10,744 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 13:32:10,745 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 13:32:10,745 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 13:32:10,746 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 13:32:10,746 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 13:32:10,747 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 13:32:10,748 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 13:32:10,748 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 13:32:10,748 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 13:32:10,749 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 13:32:10,749 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 13:32:10,749 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 13:32:10,750 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 13:32:10,751 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/config/svcomp-MemCleanup-32bit-Taipan_Default.epf [2022-12-14 13:32:10,771 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 13:32:10,771 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 13:32:10,771 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 13:32:10,771 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 13:32:10,772 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 13:32:10,772 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 13:32:10,772 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 13:32:10,772 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 13:32:10,773 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 13:32:10,773 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 13:32:10,773 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 13:32:10,773 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 13:32:10,773 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 13:32:10,773 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 13:32:10,774 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 13:32:10,774 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 13:32:10,774 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 13:32:10,774 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 13:32:10,775 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-14 13:32:10,775 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-14 13:32:10,775 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 13:32:10,775 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 13:32:10,775 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 13:32:10,775 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 13:32:10,776 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 13:32:10,776 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 13:32:10,776 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-12-14 13:32:10,776 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-12-14 13:32:10,776 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 13:32:10,776 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-12-14 13:32:10,777 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 13:32:10,777 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 13:32:10,777 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 13:32:10,777 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 13:32:10,777 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:32:10,777 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 13:32:10,778 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 13:32:10,778 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 13:32:10,778 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 13:32:10,778 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 13:32:10,778 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 13:32:10,778 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_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2022-12-14 13:32:10,937 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 13:32:10,954 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 13:32:10,956 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 13:32:10,957 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 13:32:10,957 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 13:32:10,958 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/verifythis/tree_max.c [2022-12-14 13:32:13,603 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 13:32:13,750 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 13:32:13,750 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/sv-benchmarks/c/verifythis/tree_max.c [2022-12-14 13:32:13,755 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/data/24c3de2f1/7ae0f7afbaef43219a835bf6763bc615/FLAGdea6026a9 [2022-12-14 13:32:13,766 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/data/24c3de2f1/7ae0f7afbaef43219a835bf6763bc615 [2022-12-14 13:32:13,768 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 13:32:13,769 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 13:32:13,771 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 13:32:13,771 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 13:32:13,774 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 13:32:13,774 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:32:13" (1/1) ... [2022-12-14 13:32:13,775 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6dcff5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:13, skipping insertion in model container [2022-12-14 13:32:13,776 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:32:13" (1/1) ... [2022-12-14 13:32:13,781 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 13:32:13,795 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 13:32:13,905 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_345d3ddc-6dd2-405c-b999-08f3af08f81f/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2022-12-14 13:32:13,922 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:32:13,932 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) [2022-12-14 13:32:13,932 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@6cfd193a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:13, skipping insertion in model container [2022-12-14 13:32:13,932 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 13:32:13,933 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-12-14 13:32:13,934 INFO L158 Benchmark]: Toolchain (without parser) took 164.28ms. Allocated memory is still 153.1MB. Free memory was 118.3MB in the beginning and 109.0MB in the end (delta: 9.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-12-14 13:32:13,934 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 102.8MB. Free memory is still 50.3MB. There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 13:32:13,935 INFO L158 Benchmark]: CACSL2BoogieTranslator took 162.04ms. Allocated memory is still 153.1MB. Free memory was 117.8MB in the beginning and 109.0MB in the end (delta: 8.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-12-14 13:32:13,936 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 102.8MB. Free memory is still 50.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 162.04ms. Allocated memory is still 153.1MB. Free memory was 117.8MB in the beginning and 109.0MB in the end (delta: 8.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 27]: 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_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/tree_max.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c --- 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-2329fc7 [2022-12-14 13:32:15,285 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 13:32:15,287 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 13:32:15,310 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 13:32:15,310 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 13:32:15,311 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 13:32:15,312 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 13:32:15,314 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 13:32:15,316 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 13:32:15,317 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 13:32:15,318 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 13:32:15,319 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 13:32:15,319 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 13:32:15,320 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 13:32:15,321 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 13:32:15,322 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 13:32:15,323 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 13:32:15,324 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 13:32:15,326 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 13:32:15,328 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 13:32:15,329 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 13:32:15,331 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 13:32:15,332 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 13:32:15,332 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 13:32:15,336 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 13:32:15,337 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 13:32:15,337 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 13:32:15,338 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 13:32:15,338 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 13:32:15,339 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 13:32:15,340 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 13:32:15,340 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 13:32:15,341 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 13:32:15,342 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 13:32:15,343 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 13:32:15,343 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 13:32:15,343 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 13:32:15,344 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 13:32:15,344 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 13:32:15,345 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 13:32:15,345 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 13:32:15,346 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf [2022-12-14 13:32:15,370 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 13:32:15,370 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 13:32:15,370 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 13:32:15,371 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 13:32:15,371 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 13:32:15,371 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 13:32:15,372 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 13:32:15,372 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 13:32:15,372 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 13:32:15,372 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 13:32:15,372 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 13:32:15,373 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 13:32:15,373 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-14 13:32:15,373 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-14 13:32:15,374 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 13:32:15,374 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 13:32:15,374 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 13:32:15,374 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 13:32:15,374 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 13:32:15,375 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 13:32:15,375 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-12-14 13:32:15,375 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-12-14 13:32:15,375 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 13:32:15,375 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-12-14 13:32:15,375 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-12-14 13:32:15,376 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-12-14 13:32:15,376 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 13:32:15,376 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 13:32:15,376 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 13:32:15,376 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-12-14 13:32:15,377 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 13:32:15,377 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:32:15,377 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 13:32:15,377 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 13:32:15,377 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2022-12-14 13:32:15,377 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:15,378 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 13:32:15,378 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-12-14 13:32:15,378 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_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2022-12-14 13:32:15,593 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 13:32:15,608 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 13:32:15,610 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 13:32:15,611 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 13:32:15,611 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 13:32:15,612 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/verifythis/tree_max.c [2022-12-14 13:32:18,104 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 13:32:18,282 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 13:32:18,282 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/sv-benchmarks/c/verifythis/tree_max.c [2022-12-14 13:32:18,289 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/data/c6c94eef2/2089c5f456ef45d5b72857ce2a26d3a0/FLAG54b3d487a [2022-12-14 13:32:18,300 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/data/c6c94eef2/2089c5f456ef45d5b72857ce2a26d3a0 [2022-12-14 13:32:18,303 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 13:32:18,305 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 13:32:18,306 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 13:32:18,306 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 13:32:18,309 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 13:32:18,309 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,310 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65d31bb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18, skipping insertion in model container [2022-12-14 13:32:18,310 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,316 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 13:32:18,330 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 13:32:18,441 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_345d3ddc-6dd2-405c-b999-08f3af08f81f/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2022-12-14 13:32:18,458 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:32:18,471 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-12-14 13:32:18,474 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 13:32:18,477 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_345d3ddc-6dd2-405c-b999-08f3af08f81f/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2022-12-14 13:32:18,486 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:32:18,492 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 13:32:18,504 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_345d3ddc-6dd2-405c-b999-08f3af08f81f/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2022-12-14 13:32:18,512 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:32:18,526 INFO L208 MainTranslator]: Completed translation [2022-12-14 13:32:18,526 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18 WrapperNode [2022-12-14 13:32:18,526 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 13:32:18,527 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 13:32:18,527 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 13:32:18,527 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 13:32:18,538 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,548 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,569 INFO L138 Inliner]: procedures = 26, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 37 [2022-12-14 13:32:18,569 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 13:32:18,570 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 13:32:18,570 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 13:32:18,570 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 13:32:18,577 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,578 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,581 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,581 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,589 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,591 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,592 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,594 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,596 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 13:32:18,597 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 13:32:18,597 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 13:32:18,597 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 13:32:18,598 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (1/1) ... [2022-12-14 13:32:18,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:32:18,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:18,624 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 13:32:18,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 13:32:18,658 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 13:32:18,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-12-14 13:32:18,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-12-14 13:32:18,659 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-12-14 13:32:18,659 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-12-14 13:32:18,659 INFO L130 BoogieDeclarations]: Found specification of procedure max [2022-12-14 13:32:18,659 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2022-12-14 13:32:18,659 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2022-12-14 13:32:18,660 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2022-12-14 13:32:18,660 INFO L130 BoogieDeclarations]: Found specification of procedure check [2022-12-14 13:32:18,660 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2022-12-14 13:32:18,660 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-12-14 13:32:18,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 13:32:18,660 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 13:32:18,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-12-14 13:32:18,728 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 13:32:18,730 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 13:32:19,010 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 13:32:19,015 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 13:32:19,015 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-12-14 13:32:19,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:32:19 BoogieIcfgContainer [2022-12-14 13:32:19,017 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 13:32:19,018 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 13:32:19,018 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 13:32:19,020 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 13:32:19,021 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 01:32:18" (1/3) ... [2022-12-14 13:32:19,021 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e85a31b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:32:19, skipping insertion in model container [2022-12-14 13:32:19,021 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:32:18" (2/3) ... [2022-12-14 13:32:19,021 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e85a31b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:32:19, skipping insertion in model container [2022-12-14 13:32:19,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:32:19" (3/3) ... [2022-12-14 13:32:19,022 INFO L112 eAbstractionObserver]: Analyzing ICFG tree_max.c [2022-12-14 13:32:19,036 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 13:32:19,036 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 20 error locations. [2022-12-14 13:32:19,068 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 13:32:19,072 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;@3a8842c5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 13:32:19,072 INFO L358 AbstractCegarLoop]: Starting to check reachability of 20 error locations. [2022-12-14 13:32:19,075 INFO L276 IsEmpty]: Start isEmpty. Operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 13:32:19,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 13:32:19,080 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:19,081 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-12-14 13:32:19,081 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:19,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:19,085 INFO L85 PathProgramCache]: Analyzing trace with hash 73597257, now seen corresponding path program 1 times [2022-12-14 13:32:19,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:19,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1673823393] [2022-12-14 13:32:19,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:19,094 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 [2022-12-14 13:32:19,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:19,096 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:19,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:19,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:19,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 13:32:19,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:19,206 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 [2022-12-14 13:32:19,217 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:19,217 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:32:19,218 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:19,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1673823393] [2022-12-14 13:32:19,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1673823393] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:32:19,219 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:32:19,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 13:32:19,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415535686] [2022-12-14 13:32:19,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:32:19,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 13:32:19,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:19,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 13:32:19,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 13:32:19,248 INFO L87 Difference]: Start difference. First operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:19,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:19,350 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2022-12-14 13:32:19,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 13:32:19,352 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-12-14 13:32:19,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:19,358 INFO L225 Difference]: With dead ends: 73 [2022-12-14 13:32:19,358 INFO L226 Difference]: Without dead ends: 71 [2022-12-14 13:32:19,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 13:32:19,361 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 6 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:19,362 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 133 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:32:19,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-12-14 13:32:19,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2022-12-14 13:32:19,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 38 states have (on average 1.631578947368421) internal successors, (62), 56 states have internal predecessors, (62), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 13:32:19,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 80 transitions. [2022-12-14 13:32:19,390 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 80 transitions. Word has length 5 [2022-12-14 13:32:19,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:19,390 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 80 transitions. [2022-12-14 13:32:19,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:19,390 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 80 transitions. [2022-12-14 13:32:19,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 13:32:19,391 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:19,391 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-12-14 13:32:19,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:19,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:32:19,593 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:19,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:19,595 INFO L85 PathProgramCache]: Analyzing trace with hash 73597258, now seen corresponding path program 1 times [2022-12-14 13:32:19,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:19,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1134284613] [2022-12-14 13:32:19,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:19,598 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 [2022-12-14 13:32:19,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:19,601 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:19,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:19,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:19,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 13:32:19,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:19,760 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 5 [2022-12-14 13:32:19,784 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:19,785 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:32:19,785 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:19,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1134284613] [2022-12-14 13:32:19,786 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1134284613] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:32:19,786 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:32:19,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 13:32:19,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193721774] [2022-12-14 13:32:19,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:32:19,788 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 13:32:19,788 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:19,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 13:32:19,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 13:32:19,789 INFO L87 Difference]: Start difference. First operand 69 states and 80 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:19,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:19,867 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2022-12-14 13:32:19,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 13:32:19,868 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-12-14 13:32:19,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:19,869 INFO L225 Difference]: With dead ends: 68 [2022-12-14 13:32:19,869 INFO L226 Difference]: Without dead ends: 68 [2022-12-14 13:32:19,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 13:32:19,870 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 2 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:19,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 132 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:32:19,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-12-14 13:32:19,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-12-14 13:32:19,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 38 states have (on average 1.605263157894737) internal successors, (61), 55 states have internal predecessors, (61), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 13:32:19,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2022-12-14 13:32:19,876 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 5 [2022-12-14 13:32:19,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:19,876 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2022-12-14 13:32:19,876 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 13:32:19,876 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2022-12-14 13:32:19,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 13:32:19,876 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:19,876 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:19,883 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:20,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:32:20,079 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:20,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:20,080 INFO L85 PathProgramCache]: Analyzing trace with hash -345289291, now seen corresponding path program 1 times [2022-12-14 13:32:20,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:20,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [581487274] [2022-12-14 13:32:20,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:20,083 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 [2022-12-14 13:32:20,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:20,086 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:20,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:20,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:20,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 13:32:20,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:20,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:20,326 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:32:20,326 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:20,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [581487274] [2022-12-14 13:32:20,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [581487274] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:32:20,326 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:32:20,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-12-14 13:32:20,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570420011] [2022-12-14 13:32:20,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:32:20,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 13:32:20,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:20,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 13:32:20,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-12-14 13:32:20,328 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 13:32:20,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:20,438 INFO L93 Difference]: Finished difference Result 83 states and 98 transitions. [2022-12-14 13:32:20,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 13:32:20,439 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-12-14 13:32:20,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:20,439 INFO L225 Difference]: With dead ends: 83 [2022-12-14 13:32:20,439 INFO L226 Difference]: Without dead ends: 83 [2022-12-14 13:32:20,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-12-14 13:32:20,440 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 11 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:20,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 432 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:32:20,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-12-14 13:32:20,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 76. [2022-12-14 13:32:20,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 61 states have internal predecessors, (66), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2022-12-14 13:32:20,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2022-12-14 13:32:20,447 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 11 [2022-12-14 13:32:20,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:20,447 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2022-12-14 13:32:20,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 13:32:20,448 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2022-12-14 13:32:20,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 13:32:20,448 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:20,448 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:20,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:32:20,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:32:20,650 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:20,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:20,652 INFO L85 PathProgramCache]: Analyzing trace with hash -159104294, now seen corresponding path program 1 times [2022-12-14 13:32:20,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:20,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [227261419] [2022-12-14 13:32:20,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:20,654 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 [2022-12-14 13:32:20,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:20,658 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:20,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Waiting until timeout for monitored process [2022-12-14 13:32:20,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:20,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 13:32:20,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:20,849 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 [2022-12-14 13:32:20,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:20,877 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:32:20,877 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:20,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [227261419] [2022-12-14 13:32:20,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [227261419] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:32:20,877 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:32:20,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 13:32:20,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402715450] [2022-12-14 13:32:20,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:32:20,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 13:32:20,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:20,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 13:32:20,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:32:20,879 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 13:32:21,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:21,095 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2022-12-14 13:32:21,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 13:32:21,095 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), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-12-14 13:32:21,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:21,097 INFO L225 Difference]: With dead ends: 80 [2022-12-14 13:32:21,097 INFO L226 Difference]: Without dead ends: 80 [2022-12-14 13:32:21,097 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:32:21,098 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 53 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:21,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 38 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:32:21,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-12-14 13:32:21,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2022-12-14 13:32:21,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 61 states have internal predecessors, (70), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2022-12-14 13:32:21,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2022-12-14 13:32:21,103 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 11 [2022-12-14 13:32:21,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:21,103 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2022-12-14 13:32:21,103 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), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 13:32:21,104 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2022-12-14 13:32:21,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 13:32:21,104 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:21,104 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:21,111 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:32:21,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:32:21,306 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:21,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:21,307 INFO L85 PathProgramCache]: Analyzing trace with hash -159104293, now seen corresponding path program 1 times [2022-12-14 13:32:21,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:21,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1068439742] [2022-12-14 13:32:21,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:21,310 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 [2022-12-14 13:32:21,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:21,313 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:21,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-12-14 13:32:21,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:21,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 13:32:21,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:21,487 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 5 [2022-12-14 13:32:21,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:21,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:32:21,524 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:21,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1068439742] [2022-12-14 13:32:21,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1068439742] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:32:21,524 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:32:21,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 13:32:21,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650051180] [2022-12-14 13:32:21,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:32:21,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 13:32:21,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:21,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 13:32:21,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:32:21,526 INFO L87 Difference]: Start difference. First operand 78 states and 93 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 13:32:21,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:21,730 INFO L93 Difference]: Finished difference Result 84 states and 103 transitions. [2022-12-14 13:32:21,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 13:32:21,731 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), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-12-14 13:32:21,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:21,732 INFO L225 Difference]: With dead ends: 84 [2022-12-14 13:32:21,732 INFO L226 Difference]: Without dead ends: 84 [2022-12-14 13:32:21,732 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:32:21,733 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 51 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:21,733 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 49 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:32:21,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-12-14 13:32:21,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2022-12-14 13:32:21,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 47 states have (on average 1.5106382978723405) internal successors, (71), 63 states have internal predecessors, (71), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (15), 13 states have call predecessors, (15), 11 states have call successors, (15) [2022-12-14 13:32:21,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 97 transitions. [2022-12-14 13:32:21,741 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 97 transitions. Word has length 11 [2022-12-14 13:32:21,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:21,741 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 97 transitions. [2022-12-14 13:32:21,741 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), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-12-14 13:32:21,741 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 97 transitions. [2022-12-14 13:32:21,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 13:32:21,742 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:21,742 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:21,749 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (6)] Ended with exit code 0 [2022-12-14 13:32:21,943 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:32:21,943 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting checkErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:21,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:21,945 INFO L85 PathProgramCache]: Analyzing trace with hash -1041946460, now seen corresponding path program 1 times [2022-12-14 13:32:21,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:21,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1990938807] [2022-12-14 13:32:21,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:21,947 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 [2022-12-14 13:32:21,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:21,950 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:21,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:22,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:22,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 13:32:22,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:22,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:22,135 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:32:22,135 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:22,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1990938807] [2022-12-14 13:32:22,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1990938807] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:32:22,135 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:32:22,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-12-14 13:32:22,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753822481] [2022-12-14 13:32:22,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:32:22,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 13:32:22,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:22,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 13:32:22,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-12-14 13:32:22,137 INFO L87 Difference]: Start difference. First operand 81 states and 97 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 13:32:22,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:22,220 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2022-12-14 13:32:22,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 13:32:22,221 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2022-12-14 13:32:22,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:22,221 INFO L225 Difference]: With dead ends: 92 [2022-12-14 13:32:22,222 INFO L226 Difference]: Without dead ends: 92 [2022-12-14 13:32:22,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-12-14 13:32:22,222 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 10 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:22,222 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 432 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:32:22,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-12-14 13:32:22,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 87. [2022-12-14 13:32:22,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 67 states have internal predecessors, (75), 12 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (16), 14 states have call predecessors, (16), 12 states have call successors, (16) [2022-12-14 13:32:22,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 103 transitions. [2022-12-14 13:32:22,227 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 103 transitions. Word has length 17 [2022-12-14 13:32:22,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:22,227 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 103 transitions. [2022-12-14 13:32:22,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 13:32:22,228 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 103 transitions. [2022-12-14 13:32:22,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 13:32:22,228 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:22,228 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:22,239 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:22,429 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:32:22,429 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:22,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:22,430 INFO L85 PathProgramCache]: Analyzing trace with hash -868680531, now seen corresponding path program 1 times [2022-12-14 13:32:22,430 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:22,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1077465527] [2022-12-14 13:32:22,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:22,431 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 [2022-12-14 13:32:22,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:22,432 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:22,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:22,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:22,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 13:32:22,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:22,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:32:22,508 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:32:22,509 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:22,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1077465527] [2022-12-14 13:32:22,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1077465527] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:32:22,509 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:32:22,509 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 13:32:22,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972255091] [2022-12-14 13:32:22,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:32:22,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 13:32:22,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:22,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 13:32:22,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:32:22,510 INFO L87 Difference]: Start difference. First operand 87 states and 103 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-12-14 13:32:22,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:22,671 INFO L93 Difference]: Finished difference Result 89 states and 104 transitions. [2022-12-14 13:32:22,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 13:32:22,672 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2022-12-14 13:32:22,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:22,672 INFO L225 Difference]: With dead ends: 89 [2022-12-14 13:32:22,672 INFO L226 Difference]: Without dead ends: 75 [2022-12-14 13:32:22,672 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:32:22,673 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 46 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:22,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 48 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:32:22,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-12-14 13:32:22,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-12-14 13:32:22,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 43 states have (on average 1.558139534883721) internal successors, (67), 59 states have internal predecessors, (67), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2022-12-14 13:32:22,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-12-14 13:32:22,677 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 20 [2022-12-14 13:32:22,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:22,677 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-12-14 13:32:22,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-12-14 13:32:22,677 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-12-14 13:32:22,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 13:32:22,678 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:22,678 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:22,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:32:22,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:32:22,880 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:22,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:22,881 INFO L85 PathProgramCache]: Analyzing trace with hash -360622958, now seen corresponding path program 1 times [2022-12-14 13:32:22,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:22,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2128470907] [2022-12-14 13:32:22,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:22,884 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 [2022-12-14 13:32:22,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:22,887 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:22,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:23,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:23,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 13:32:23,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:23,105 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 [2022-12-14 13:32:23,134 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_107 (_ BitVec 1))) (= (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_107) |c_#valid|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:23,168 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_107 (_ BitVec 1))) (and (= (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_107) |c_#valid|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:23,243 INFO L321 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-12-14 13:32:23,244 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 [2022-12-14 13:32:23,252 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 8 not checked. [2022-12-14 13:32:23,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:23,378 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:23,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2128470907] [2022-12-14 13:32:23,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2128470907] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:23,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1453998220] [2022-12-14 13:32:23,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:23,379 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:23,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:32:23,380 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:32:23,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2022-12-14 13:32:23,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:23,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 13:32:23,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:23,549 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 0 case distinctions, treesize of input 6 treesize of output 7 [2022-12-14 13:32:23,563 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (= (store |c_old(#valid)| nondet_tree_~n~0.base (_ bv1 1)) |c_#valid|)) is different from true [2022-12-14 13:32:23,610 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 13:32:23,610 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 [2022-12-14 13:32:23,618 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 8 not checked. [2022-12-14 13:32:23,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:23,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1453998220] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:23,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145167923] [2022-12-14 13:32:23,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:23,718 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:23,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:23,719 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:23,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 13:32:23,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:23,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 13:32:23,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:23,807 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 [2022-12-14 13:32:23,821 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_241 (_ BitVec 1))) (= (store |c_old(#valid)| c_nondet_tree_~n~0.base v_ArrVal_241) |c_#valid|)) is different from true [2022-12-14 13:32:23,888 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 13:32:23,889 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 [2022-12-14 13:32:23,895 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 8 not checked. [2022-12-14 13:32:23,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:23,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145167923] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:23,982 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:32:23,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 6] total 8 [2022-12-14 13:32:23,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703111233] [2022-12-14 13:32:23,982 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:23,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 13:32:23,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:23,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 13:32:23,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=4, NotChecked=44, Total=90 [2022-12-14 13:32:23,983 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 9 states, 8 states have (on average 4.0) internal successors, (32), 9 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2022-12-14 13:32:30,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:30,497 INFO L93 Difference]: Finished difference Result 99 states and 119 transitions. [2022-12-14 13:32:30,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 13:32:30,498 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.0) internal successors, (32), 9 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) Word has length 29 [2022-12-14 13:32:30,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:30,499 INFO L225 Difference]: With dead ends: 99 [2022-12-14 13:32:30,499 INFO L226 Difference]: Without dead ends: 97 [2022-12-14 13:32:30,499 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 8 SemanticMatches, 11 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=35, Invalid=49, Unknown=4, NotChecked=68, Total=156 [2022-12-14 13:32:30,499 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 101 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 36 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 694 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 441 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:30,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 48 Invalid, 694 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 214 Invalid, 3 Unknown, 441 Unchecked, 0.4s Time] [2022-12-14 13:32:30,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-12-14 13:32:30,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 88. [2022-12-14 13:32:30,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 53 states have (on average 1.509433962264151) internal successors, (80), 68 states have internal predecessors, (80), 10 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (19), 13 states have call predecessors, (19), 10 states have call successors, (19) [2022-12-14 13:32:30,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 109 transitions. [2022-12-14 13:32:30,504 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 109 transitions. Word has length 29 [2022-12-14 13:32:30,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:30,504 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 109 transitions. [2022-12-14 13:32:30,505 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.0) internal successors, (32), 9 states have internal predecessors, (32), 7 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2022-12-14 13:32:30,505 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 109 transitions. [2022-12-14 13:32:30,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 13:32:30,505 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:30,505 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:30,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Forceful destruction successful, exit code 0 [2022-12-14 13:32:30,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 13:32:30,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2022-12-14 13:32:31,107 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:31,109 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:31,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:31,110 INFO L85 PathProgramCache]: Analyzing trace with hash -120629553, now seen corresponding path program 1 times [2022-12-14 13:32:31,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:31,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1884231031] [2022-12-14 13:32:31,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:31,112 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 [2022-12-14 13:32:31,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:31,115 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:31,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Waiting until timeout for monitored process [2022-12-14 13:32:31,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:31,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 13:32:31,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:31,247 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 [2022-12-14 13:32:31,252 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 5 [2022-12-14 13:32:31,301 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_293 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_293) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:31,333 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_293 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_293) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:31,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:32:31,382 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 [2022-12-14 13:32:31,393 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:32:31,393 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 [2022-12-14 13:32:31,405 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 8 not checked. [2022-12-14 13:32:31,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:33,608 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:33,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1884231031] [2022-12-14 13:32:33,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1884231031] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:33,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [866808337] [2022-12-14 13:32:33,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:33,609 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:33,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:32:33,610 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:32:33,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2022-12-14 13:32:33,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:33,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 13:32:33,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:33,769 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 5 [2022-12-14 13:32:33,772 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 [2022-12-14 13:32:33,799 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_345 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_345) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:33,826 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_345 (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_345) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:33,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:32:33,883 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 [2022-12-14 13:32:33,889 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:32:33,889 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 [2022-12-14 13:32:33,893 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 8 not checked. [2022-12-14 13:32:33,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:34,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [866808337] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:34,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045354136] [2022-12-14 13:32:34,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:34,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:34,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:34,033 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:34,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 13:32:34,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:34,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 13:32:34,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:34,106 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 5 [2022-12-14 13:32:34,121 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) |c_#length|)) is different from true [2022-12-14 13:32:34,167 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-12-14 13:32:34,167 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 12 treesize of output 14 [2022-12-14 13:32:34,184 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 8 not checked. [2022-12-14 13:32:34,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:34,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045354136] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:34,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:32:34,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 4] total 10 [2022-12-14 13:32:34,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820436985] [2022-12-14 13:32:34,499 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:34,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-12-14 13:32:34,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:34,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-12-14 13:32:34,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=53, Unknown=6, NotChecked=90, Total=182 [2022-12-14 13:32:34,500 INFO L87 Difference]: Start difference. First operand 88 states and 109 transitions. Second operand has 11 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 8 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) [2022-12-14 13:32:34,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:34,820 INFO L93 Difference]: Finished difference Result 95 states and 122 transitions. [2022-12-14 13:32:34,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 13:32:34,821 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 8 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) Word has length 25 [2022-12-14 13:32:34,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:34,822 INFO L225 Difference]: With dead ends: 95 [2022-12-14 13:32:34,822 INFO L226 Difference]: Without dead ends: 95 [2022-12-14 13:32:34,822 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 64 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=40, Invalid=64, Unknown=6, NotChecked=100, Total=210 [2022-12-14 13:32:34,822 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 108 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 503 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:34,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 48 Invalid, 687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 154 Invalid, 0 Unknown, 503 Unchecked, 0.2s Time] [2022-12-14 13:32:34,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-12-14 13:32:34,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 91. [2022-12-14 13:32:34,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 55 states have (on average 1.4727272727272727) internal successors, (81), 70 states have internal predecessors, (81), 11 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (22), 14 states have call predecessors, (22), 11 states have call successors, (22) [2022-12-14 13:32:34,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 114 transitions. [2022-12-14 13:32:34,827 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 114 transitions. Word has length 25 [2022-12-14 13:32:34,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:34,827 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 114 transitions. [2022-12-14 13:32:34,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 8 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) [2022-12-14 13:32:34,828 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 114 transitions. [2022-12-14 13:32:34,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 13:32:34,828 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:34,828 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:34,831 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (13)] Ended with exit code 0 [2022-12-14 13:32:35,060 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Forceful destruction successful, exit code 0 [2022-12-14 13:32:35,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-12-14 13:32:35,430 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:35,431 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:35,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:35,432 INFO L85 PathProgramCache]: Analyzing trace with hash -694882647, now seen corresponding path program 1 times [2022-12-14 13:32:35,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:35,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1247702504] [2022-12-14 13:32:35,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:35,434 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 [2022-12-14 13:32:35,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:35,436 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:35,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-12-14 13:32:35,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:35,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 13:32:35,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:35,514 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 [2022-12-14 13:32:35,577 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:35,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:35,706 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:35,706 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:35,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1247702504] [2022-12-14 13:32:35,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1247702504] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:35,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [31639030] [2022-12-14 13:32:35,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:35,707 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:35,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:32:35,708 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:32:35,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2022-12-14 13:32:35,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:35,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 13:32:35,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:35,807 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 [2022-12-14 13:32:35,834 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:35,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:35,955 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:35,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [31639030] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:35,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1766168818] [2022-12-14 13:32:35,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:35,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:35,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:35,956 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:35,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 13:32:36,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:36,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 13:32:36,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:36,042 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:32:36,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:36,118 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:32:36,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1766168818] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:36,118 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:32:36,118 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 9 [2022-12-14 13:32:36,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007127967] [2022-12-14 13:32:36,119 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:36,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 13:32:36,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:36,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 13:32:36,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2022-12-14 13:32:36,120 INFO L87 Difference]: Start difference. First operand 91 states and 114 transitions. Second operand has 10 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 13:32:36,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:36,741 INFO L93 Difference]: Finished difference Result 104 states and 133 transitions. [2022-12-14 13:32:36,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 13:32:36,741 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 25 [2022-12-14 13:32:36,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:36,742 INFO L225 Difference]: With dead ends: 104 [2022-12-14 13:32:36,742 INFO L226 Difference]: Without dead ends: 104 [2022-12-14 13:32:36,742 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 134 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2022-12-14 13:32:36,742 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 177 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:36,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [179 Valid, 59 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 13:32:36,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-12-14 13:32:36,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 96. [2022-12-14 13:32:36,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 74 states have internal predecessors, (88), 13 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (23), 15 states have call predecessors, (23), 13 states have call successors, (23) [2022-12-14 13:32:36,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 124 transitions. [2022-12-14 13:32:36,747 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 124 transitions. Word has length 25 [2022-12-14 13:32:36,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:36,747 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 124 transitions. [2022-12-14 13:32:36,747 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 13:32:36,747 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 124 transitions. [2022-12-14 13:32:36,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 13:32:36,748 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:36,748 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:36,755 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (15)] Ended with exit code 0 [2022-12-14 13:32:36,957 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 13:32:37,154 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2022-12-14 13:32:37,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:37,351 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:37,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:37,352 INFO L85 PathProgramCache]: Analyzing trace with hash -694882646, now seen corresponding path program 1 times [2022-12-14 13:32:37,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:37,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [861208231] [2022-12-14 13:32:37,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:37,353 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 [2022-12-14 13:32:37,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:37,354 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:37,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:37,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:37,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 13:32:37,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:37,508 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 5 [2022-12-14 13:32:37,628 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:37,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:38,546 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:38,546 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:38,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [861208231] [2022-12-14 13:32:38,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [861208231] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:38,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1520116732] [2022-12-14 13:32:38,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:38,547 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:38,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:32:38,547 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:32:38,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2022-12-14 13:32:38,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:38,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 13:32:38,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:38,688 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 6 treesize of output 5 [2022-12-14 13:32:38,760 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:38,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:39,712 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:39,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1520116732] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:39,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937092777] [2022-12-14 13:32:39,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:39,713 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:39,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:39,714 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:39,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 13:32:39,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:39,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 13:32:39,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:39,793 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-12-14 13:32:39,850 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:39,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:40,537 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:32:40,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937092777] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:40,537 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:32:40,537 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2022-12-14 13:32:40,537 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439208007] [2022-12-14 13:32:40,538 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:40,538 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 13:32:40,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:40,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 13:32:40,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2022-12-14 13:32:40,539 INFO L87 Difference]: Start difference. First operand 96 states and 124 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-12-14 13:32:42,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:42,381 INFO L93 Difference]: Finished difference Result 121 states and 160 transitions. [2022-12-14 13:32:42,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 13:32:42,381 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 25 [2022-12-14 13:32:42,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:42,382 INFO L225 Difference]: With dead ends: 121 [2022-12-14 13:32:42,382 INFO L226 Difference]: Without dead ends: 121 [2022-12-14 13:32:42,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 125 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-12-14 13:32:42,383 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 162 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 682 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:42,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 107 Invalid, 731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 682 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 13:32:42,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-12-14 13:32:42,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 112. [2022-12-14 13:32:42,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 74 states have (on average 1.3918918918918919) internal successors, (103), 86 states have internal predecessors, (103), 16 states have call successors, (16), 7 states have call predecessors, (16), 8 states have return successors, (26), 18 states have call predecessors, (26), 16 states have call successors, (26) [2022-12-14 13:32:42,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 145 transitions. [2022-12-14 13:32:42,387 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 145 transitions. Word has length 25 [2022-12-14 13:32:42,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:42,388 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 145 transitions. [2022-12-14 13:32:42,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-12-14 13:32:42,388 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 145 transitions. [2022-12-14 13:32:42,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 13:32:42,388 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:42,389 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:42,393 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 13:32:42,617 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:42,795 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (19)] Ended with exit code 0 [2022-12-14 13:32:42,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:42,991 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting checkErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:42,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:42,992 INFO L85 PathProgramCache]: Analyzing trace with hash 986137240, now seen corresponding path program 1 times [2022-12-14 13:32:42,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:42,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [544708179] [2022-12-14 13:32:42,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:42,994 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 [2022-12-14 13:32:42,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:42,996 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:42,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:43,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:43,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 13:32:43,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:43,120 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 13:32:43,120 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:32:43,121 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:43,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [544708179] [2022-12-14 13:32:43,121 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [544708179] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:32:43,121 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:32:43,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 13:32:43,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217213834] [2022-12-14 13:32:43,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:32:43,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 13:32:43,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:43,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 13:32:43,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-12-14 13:32:43,122 INFO L87 Difference]: Start difference. First operand 112 states and 145 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 13:32:43,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:43,295 INFO L93 Difference]: Finished difference Result 118 states and 154 transitions. [2022-12-14 13:32:43,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 13:32:43,296 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2022-12-14 13:32:43,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:43,296 INFO L225 Difference]: With dead ends: 118 [2022-12-14 13:32:43,296 INFO L226 Difference]: Without dead ends: 114 [2022-12-14 13:32:43,296 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-12-14 13:32:43,297 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 27 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:43,297 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 357 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:32:43,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-12-14 13:32:43,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2022-12-14 13:32:43,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 74 states have (on average 1.364864864864865) internal successors, (101), 86 states have internal predecessors, (101), 16 states have call successors, (16), 7 states have call predecessors, (16), 8 states have return successors, (26), 18 states have call predecessors, (26), 16 states have call successors, (26) [2022-12-14 13:32:43,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 143 transitions. [2022-12-14 13:32:43,301 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 143 transitions. Word has length 31 [2022-12-14 13:32:43,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:43,301 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 143 transitions. [2022-12-14 13:32:43,301 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 13:32:43,301 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 143 transitions. [2022-12-14 13:32:43,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 13:32:43,302 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:43,302 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:32:43,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:43,503 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:32:43,503 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:43,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:43,504 INFO L85 PathProgramCache]: Analyzing trace with hash 1746105865, now seen corresponding path program 1 times [2022-12-14 13:32:43,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:43,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [798320019] [2022-12-14 13:32:43,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:43,506 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 [2022-12-14 13:32:43,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:43,509 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:43,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:43,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:43,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2022-12-14 13:32:43,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:43,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:32:43,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:32:43,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 23 treesize of output 22 [2022-12-14 13:32:43,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:32:43,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-12-14 13:32:43,935 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-12-14 13:32:44,016 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:32:44,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:44,737 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:32:44,738 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:44,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [798320019] [2022-12-14 13:32:44,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [798320019] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:44,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [178638875] [2022-12-14 13:32:44,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:44,738 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:44,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:32:44,739 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:32:44,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2022-12-14 13:32:44,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:44,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 39 conjunts are in the unsatisfiable core [2022-12-14 13:32:44,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:45,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:32:45,004 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:32:45,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:32:45,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:32:45,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:32:45,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:32:45,378 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:32:45,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:46,092 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:32:46,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [178638875] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:46,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582695987] [2022-12-14 13:32:46,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:46,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:46,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:46,093 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:46,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 13:32:46,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:46,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 13:32:46,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:46,199 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:32:46,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:32:46,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:32:46,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:32:46,298 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:32:46,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:32:46,309 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:32:46,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:46,988 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 13:32:46,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582695987] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:46,988 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:32:46,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 15, 14, 15, 14] total 23 [2022-12-14 13:32:46,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390780707] [2022-12-14 13:32:46,988 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:46,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 13:32:46,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:46,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 13:32:46,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=453, Unknown=0, NotChecked=0, Total=506 [2022-12-14 13:32:46,990 INFO L87 Difference]: Start difference. First operand 112 states and 143 transitions. Second operand has 23 states, 20 states have (on average 1.95) internal successors, (39), 16 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2022-12-14 13:32:48,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:32:48,444 INFO L93 Difference]: Finished difference Result 123 states and 158 transitions. [2022-12-14 13:32:48,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 13:32:48,444 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 1.95) internal successors, (39), 16 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 31 [2022-12-14 13:32:48,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:32:48,445 INFO L225 Difference]: With dead ends: 123 [2022-12-14 13:32:48,445 INFO L226 Difference]: Without dead ends: 123 [2022-12-14 13:32:48,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 157 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=127, Invalid=995, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 13:32:48,446 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 166 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 1184 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 1234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:32:48,446 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 273 Invalid, 1234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1184 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 13:32:48,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-12-14 13:32:48,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 116. [2022-12-14 13:32:48,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 77 states have (on average 1.3506493506493507) internal successors, (104), 89 states have internal predecessors, (104), 16 states have call successors, (16), 8 states have call predecessors, (16), 9 states have return successors, (26), 18 states have call predecessors, (26), 16 states have call successors, (26) [2022-12-14 13:32:48,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 146 transitions. [2022-12-14 13:32:48,453 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 146 transitions. Word has length 31 [2022-12-14 13:32:48,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:32:48,453 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 146 transitions. [2022-12-14 13:32:48,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 1.95) internal successors, (39), 16 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2022-12-14 13:32:48,453 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 146 transitions. [2022-12-14 13:32:48,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-12-14 13:32:48,455 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:32:48,455 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2022-12-14 13:32:48,457 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (23)] Ended with exit code 0 [2022-12-14 13:32:48,663 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 13:32:48,869 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:32:49,056 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:32:49,058 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:32:49,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:32:49,059 INFO L85 PathProgramCache]: Analyzing trace with hash 864934772, now seen corresponding path program 1 times [2022-12-14 13:32:49,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:32:49,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [374533288] [2022-12-14 13:32:49,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:49,061 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 [2022-12-14 13:32:49,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:32:49,064 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:32:49,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:32:49,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:49,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 13:32:49,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:49,279 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 5 [2022-12-14 13:32:49,284 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 [2022-12-14 13:32:49,358 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_841 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_841) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:49,387 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_841 (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_841) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:49,406 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) |c_#length|)) is different from true [2022-12-14 13:32:49,447 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_841 (_ BitVec 32)) (v_nondet_tree_~n~0.base_68 (_ BitVec 32))) (and (= |c_#length| (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_841) v_nondet_tree_~n~0.base_68 (_ bv12 32))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:49,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:32:49,500 INFO L321 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-12-14 13:32:49,501 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 2 case distinctions, treesize of input 15 treesize of output 23 [2022-12-14 13:32:49,515 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:32:49,516 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 [2022-12-14 13:32:49,539 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 13 trivial. 40 not checked. [2022-12-14 13:32:49,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:51,821 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:32:51,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [374533288] [2022-12-14 13:32:51,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [374533288] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:51,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [590873059] [2022-12-14 13:32:51,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:51,822 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:32:51,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:32:51,823 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:32:51,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2022-12-14 13:32:52,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:52,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 13:32:52,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:52,098 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 [2022-12-14 13:32:52,103 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 5 [2022-12-14 13:32:52,153 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_930 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_930) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:52,174 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_930 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_930) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:52,218 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_930 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_nondet_tree_~n~0.base_79 (_ BitVec 32))) (and (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (= (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_930) v_nondet_tree_~n~0.base_79 (_ bv12 32)) |c_#length|))) is different from true [2022-12-14 13:32:52,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:32:52,260 INFO L321 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-12-14 13:32:52,261 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 2 case distinctions, treesize of input 15 treesize of output 23 [2022-12-14 13:32:52,274 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:32:52,274 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 [2022-12-14 13:32:52,291 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 13 trivial. 40 not checked. [2022-12-14 13:32:52,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:54,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [590873059] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:54,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281345943] [2022-12-14 13:32:54,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:32:54,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:32:54,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:32:54,587 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:32:54,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 13:32:54,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:32:54,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 29 conjunts are in the unsatisfiable core [2022-12-14 13:32:54,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:32:54,698 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 5 [2022-12-14 13:32:54,845 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (exists ((v_ArrVal_1020 (_ BitVec 32))) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1020))))) is different from true [2022-12-14 13:32:54,865 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1020 (_ BitVec 32))) (and (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1020)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:32:54,907 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_90 (_ BitVec 32)) (v_ArrVal_1018 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1020 (_ BitVec 32))) (and (= (select |c_old(#valid)| v_nondet_tree_~n~0.base_90) (_ bv0 1)) (= (_ bv0 1) (select (store |c_old(#valid)| v_nondet_tree_~n~0.base_90 (_ bv1 1)) nondet_tree_~n~0.base)) (= (store (store |c_old(#length)| v_nondet_tree_~n~0.base_90 v_ArrVal_1018) nondet_tree_~n~0.base v_ArrVal_1020) |c_#length|))) is different from true [2022-12-14 13:32:54,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:32:54,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:32:54,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:32:54,952 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 19 [2022-12-14 13:32:54,972 INFO L321 Elim1Store]: treesize reduction 22, result has 29.0 percent of original size [2022-12-14 13:32:54,972 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2022-12-14 13:32:54,976 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 34 not checked. [2022-12-14 13:32:54,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:55,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1281345943] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:32:55,482 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:32:55,482 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 10] total 17 [2022-12-14 13:32:55,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329982010] [2022-12-14 13:32:55,482 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:32:55,482 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 13:32:55,482 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:32:55,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 13:32:55,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=93, Unknown=11, NotChecked=270, Total=420 [2022-12-14 13:32:55,483 INFO L87 Difference]: Start difference. First operand 116 states and 146 transitions. Second operand has 18 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 18 states have internal predecessors, (56), 12 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (15), 10 states have call predecessors, (15), 11 states have call successors, (15) [2022-12-14 13:33:02,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:33:02,585 INFO L93 Difference]: Finished difference Result 128 states and 171 transitions. [2022-12-14 13:33:02,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 13:33:02,586 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 18 states have internal predecessors, (56), 12 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (15), 10 states have call predecessors, (15), 11 states have call successors, (15) Word has length 45 [2022-12-14 13:33:02,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:33:02,586 INFO L225 Difference]: With dead ends: 128 [2022-12-14 13:33:02,586 INFO L226 Difference]: Without dead ends: 128 [2022-12-14 13:33:02,587 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 117 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 10 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=62, Invalid=122, Unknown=12, NotChecked=310, Total=506 [2022-12-14 13:33:02,587 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 102 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 28 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 972 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 13:33:02,587 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 70 Invalid, 1380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 375 Invalid, 5 Unknown, 972 Unchecked, 0.7s Time] [2022-12-14 13:33:02,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-12-14 13:33:02,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 120. [2022-12-14 13:33:02,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 80 states have (on average 1.3375) internal successors, (107), 92 states have internal predecessors, (107), 16 states have call successors, (16), 8 states have call predecessors, (16), 10 states have return successors, (31), 19 states have call predecessors, (31), 16 states have call successors, (31) [2022-12-14 13:33:02,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 154 transitions. [2022-12-14 13:33:02,591 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 154 transitions. Word has length 45 [2022-12-14 13:33:02,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:33:02,591 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 154 transitions. [2022-12-14 13:33:02,591 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 18 states have internal predecessors, (56), 12 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (15), 10 states have call predecessors, (15), 11 states have call successors, (15) [2022-12-14 13:33:02,592 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 154 transitions. [2022-12-14 13:33:02,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-12-14 13:33:02,593 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:33:02,593 INFO L195 NwaCegarLoop]: trace histogram [10, 7, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 3, 1, 1, 1, 1] [2022-12-14 13:33:02,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-12-14 13:33:02,802 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (26)] Ended with exit code 0 [2022-12-14 13:33:03,026 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:33:03,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:33:03,195 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:33:03,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:33:03,196 INFO L85 PathProgramCache]: Analyzing trace with hash 1689232716, now seen corresponding path program 2 times [2022-12-14 13:33:03,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:33:03,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1678120544] [2022-12-14 13:33:03,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:33:03,199 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 [2022-12-14 13:33:03,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:33:03,200 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:33:03,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:33:03,590 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:33:03,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:03,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 13:33:03,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:03,615 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 [2022-12-14 13:33:03,620 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 5 [2022-12-14 13:33:03,699 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (exists ((v_ArrVal_1189 (_ BitVec 32))) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1189))))) is different from true [2022-12-14 13:33:03,724 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) |c_#length|)) is different from true [2022-12-14 13:33:03,773 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_101 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1189 (_ BitVec 32))) (and (= (store (store |c_old(#length)| v_nondet_tree_~n~0.base_101 v_ArrVal_1189) nondet_tree_~n~0.base (_ bv12 32)) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| v_nondet_tree_~n~0.base_101)))) is different from true [2022-12-14 13:33:03,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:33:03,857 INFO L321 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-12-14 13:33:03,858 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 2 case distinctions, treesize of input 15 treesize of output 23 [2022-12-14 13:33:03,873 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:33:03,873 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 [2022-12-14 13:33:03,904 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 149 proven. 14 refuted. 0 times theorem prover too weak. 64 trivial. 40 not checked. [2022-12-14 13:33:03,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:04,158 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:33:04,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1678120544] [2022-12-14 13:33:04,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1678120544] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:33:04,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1393514462] [2022-12-14 13:33:04,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:33:04,158 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:33:04,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:33:04,159 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:33:04,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2022-12-14 13:33:04,562 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:33:04,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:04,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 13:33:04,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:04,592 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 5 [2022-12-14 13:33:04,597 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 [2022-12-14 13:33:04,655 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (exists ((v_ArrVal_1353 (_ BitVec 32))) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1353))))) is different from true [2022-12-14 13:33:04,720 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_112 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1353 (_ BitVec 32))) (and (= (_ bv0 1) (select |c_old(#valid)| v_nondet_tree_~n~0.base_112)) (= (store (store |c_old(#length)| v_nondet_tree_~n~0.base_112 v_ArrVal_1353) nondet_tree_~n~0.base (_ bv12 32)) |c_#length|))) is different from true [2022-12-14 13:33:04,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:33:04,809 INFO L321 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-12-14 13:33:04,809 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 2 case distinctions, treesize of input 15 treesize of output 23 [2022-12-14 13:33:04,826 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:33:04,826 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 [2022-12-14 13:33:04,840 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 149 proven. 14 refuted. 0 times theorem prover too weak. 64 trivial. 40 not checked. [2022-12-14 13:33:04,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:05,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1393514462] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:33:05,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638876282] [2022-12-14 13:33:05,163 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:33:05,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:05,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:33:05,164 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:33:05,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 13:33:05,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:33:05,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:05,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 27 conjunts are in the unsatisfiable core [2022-12-14 13:33:05,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:05,350 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 5 [2022-12-14 13:33:05,477 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_1518 (_ BitVec 32))) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1518))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:05,504 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1518 (_ BitVec 32))) (and (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1518)))) is different from true [2022-12-14 13:33:05,563 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_123 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1518 (_ BitVec 32))) (and (= (_ bv0 1) (select (store |c_old(#valid)| nondet_tree_~n~0.base (_ bv1 1)) v_nondet_tree_~n~0.base_123)) (= |c_#length| (store (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) v_nondet_tree_~n~0.base_123 v_ArrVal_1518)))) is different from true [2022-12-14 13:33:05,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:33:05,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:33:05,636 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-12-14 13:33:05,637 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2022-12-14 13:33:05,647 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:33:05,647 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 17 treesize of output 17 [2022-12-14 13:33:05,663 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 151 proven. 9 refuted. 0 times theorem prover too weak. 70 trivial. 37 not checked. [2022-12-14 13:33:05,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:14,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638876282] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:33:14,203 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:33:14,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 10] total 15 [2022-12-14 13:33:14,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500041033] [2022-12-14 13:33:14,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:33:14,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 13:33:14,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:33:14,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 13:33:14,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=10, NotChecked=200, Total=342 [2022-12-14 13:33:14,205 INFO L87 Difference]: Start difference. First operand 120 states and 154 transitions. Second operand has 16 states, 15 states have (on average 4.333333333333333) internal successors, (65), 16 states have internal predecessors, (65), 12 states have call successors, (16), 3 states have call predecessors, (16), 8 states have return successors, (17), 8 states have call predecessors, (17), 12 states have call successors, (17) [2022-12-14 13:33:17,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:33:17,483 INFO L93 Difference]: Finished difference Result 139 states and 193 transitions. [2022-12-14 13:33:17,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 13:33:17,484 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 4.333333333333333) internal successors, (65), 16 states have internal predecessors, (65), 12 states have call successors, (16), 3 states have call predecessors, (16), 8 states have return successors, (17), 8 states have call predecessors, (17), 12 states have call successors, (17) Word has length 79 [2022-12-14 13:33:17,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:33:17,485 INFO L225 Difference]: With dead ends: 139 [2022-12-14 13:33:17,485 INFO L226 Difference]: Without dead ends: 139 [2022-12-14 13:33:17,485 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 220 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 8 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=63, Invalid=140, Unknown=11, NotChecked=248, Total=462 [2022-12-14 13:33:17,486 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 71 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 30 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 1298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 888 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:33:17,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 76 Invalid, 1298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 379 Invalid, 1 Unknown, 888 Unchecked, 1.0s Time] [2022-12-14 13:33:17,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-12-14 13:33:17,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2022-12-14 13:33:17,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 89 states have (on average 1.3146067415730338) internal successors, (117), 101 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 12 states have return successors, (46), 22 states have call predecessors, (46), 18 states have call successors, (46) [2022-12-14 13:33:17,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 181 transitions. [2022-12-14 13:33:17,493 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 181 transitions. Word has length 79 [2022-12-14 13:33:17,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:33:17,493 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 181 transitions. [2022-12-14 13:33:17,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 4.333333333333333) internal successors, (65), 16 states have internal predecessors, (65), 12 states have call successors, (16), 3 states have call predecessors, (16), 8 states have return successors, (17), 8 states have call predecessors, (17), 12 states have call successors, (17) [2022-12-14 13:33:17,493 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 181 transitions. [2022-12-14 13:33:17,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 13:33:17,494 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:33:17,494 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:33:17,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2022-12-14 13:33:17,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:33:17,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-12-14 13:33:18,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:18,097 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:33:18,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:33:18,098 INFO L85 PathProgramCache]: Analyzing trace with hash -101280226, now seen corresponding path program 2 times [2022-12-14 13:33:18,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:33:18,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [388712815] [2022-12-14 13:33:18,100 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:33:18,100 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 [2022-12-14 13:33:18,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:33:18,101 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:33:18,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:33:18,261 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:33:18,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:18,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2022-12-14 13:33:18,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:18,391 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 13:33:18,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:18,853 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 22 treesize of output 18 [2022-12-14 13:33:19,004 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 13:33:19,004 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:33:19,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [388712815] [2022-12-14 13:33:19,004 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [388712815] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:33:19,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1240367950] [2022-12-14 13:33:19,004 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:33:19,004 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:33:19,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:33:19,005 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:33:19,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2022-12-14 13:33:19,208 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:33:19,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:19,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2022-12-14 13:33:19,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:19,270 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 13:33:19,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:19,419 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 22 treesize of output 18 [2022-12-14 13:33:19,491 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 13:33:19,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1240367950] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:33:19,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961559349] [2022-12-14 13:33:19,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:33:19,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:19,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:33:19,493 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:33:19,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 13:33:19,615 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:33:19,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:19,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2022-12-14 13:33:19,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:19,691 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 13:33:19,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:19,837 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 22 treesize of output 18 [2022-12-14 13:33:19,914 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 13:33:19,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1961559349] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:33:19,915 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:33:19,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2022-12-14 13:33:19,915 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312221045] [2022-12-14 13:33:19,915 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:33:19,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 13:33:19,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:33:19,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 13:33:19,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2022-12-14 13:33:19,916 INFO L87 Difference]: Start difference. First operand 133 states and 181 transitions. Second operand has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2022-12-14 13:33:21,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:33:21,150 INFO L93 Difference]: Finished difference Result 135 states and 184 transitions. [2022-12-14 13:33:21,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 13:33:21,152 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) Word has length 39 [2022-12-14 13:33:21,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:33:21,152 INFO L225 Difference]: With dead ends: 135 [2022-12-14 13:33:21,152 INFO L226 Difference]: Without dead ends: 135 [2022-12-14 13:33:21,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 213 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2022-12-14 13:33:21,153 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 61 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:33:21,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 446 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 13:33:21,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-12-14 13:33:21,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2022-12-14 13:33:21,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 89 states have (on average 1.2808988764044944) internal successors, (114), 101 states have internal predecessors, (114), 18 states have call successors, (18), 9 states have call predecessors, (18), 12 states have return successors, (46), 22 states have call predecessors, (46), 18 states have call successors, (46) [2022-12-14 13:33:21,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 178 transitions. [2022-12-14 13:33:21,157 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 178 transitions. Word has length 39 [2022-12-14 13:33:21,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:33:21,157 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 178 transitions. [2022-12-14 13:33:21,157 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2022-12-14 13:33:21,158 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 178 transitions. [2022-12-14 13:33:21,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-12-14 13:33:21,158 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:33:21,158 INFO L195 NwaCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2022-12-14 13:33:21,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:33:21,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2022-12-14 13:33:21,573 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 13:33:21,760 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:21,761 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:33:21,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:33:21,762 INFO L85 PathProgramCache]: Analyzing trace with hash -649465289, now seen corresponding path program 2 times [2022-12-14 13:33:21,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:33:21,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [164001294] [2022-12-14 13:33:21,763 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:33:21,764 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 [2022-12-14 13:33:21,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:33:21,765 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:33:21,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:33:22,019 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:33:22,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:22,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 13:33:22,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:22,038 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 5 [2022-12-14 13:33:22,043 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 [2022-12-14 13:33:22,090 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_1807 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1807) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:22,118 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1807 (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1807) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:22,137 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) |c_#length|)) is different from true [2022-12-14 13:33:22,197 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_164 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (= (store (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) v_nondet_tree_~n~0.base_164 (_ bv12 32)) |c_#length|)) is different from true [2022-12-14 13:33:22,217 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_164 (_ BitVec 32)) (v_nondet_tree_~n~0.base_165 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1807 (_ BitVec 32))) (and (= (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1807) v_nondet_tree_~n~0.base_165 (_ bv12 32)) v_nondet_tree_~n~0.base_164 (_ bv12 32)) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:22,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:33:22,306 INFO L321 Elim1Store]: treesize reduction 67, result has 25.6 percent of original size [2022-12-14 13:33:22,307 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 3 case distinctions, treesize of input 18 treesize of output 31 [2022-12-14 13:33:22,322 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:33:22,322 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 [2022-12-14 13:33:22,353 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 60 not checked. [2022-12-14 13:33:22,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:24,725 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:33:24,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [164001294] [2022-12-14 13:33:24,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [164001294] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:33:24,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1928121747] [2022-12-14 13:33:24,726 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:33:24,726 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:33:24,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:33:24,727 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:33:24,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2022-12-14 13:33:25,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:33:25,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:25,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 33 conjunts are in the unsatisfiable core [2022-12-14 13:33:25,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:25,102 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 5 [2022-12-14 13:33:25,108 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 [2022-12-14 13:33:25,137 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_1922 (_ BitVec 1))) (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_1922))) (exists ((v_ArrVal_1921 (_ BitVec 32))) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1921))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:25,172 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_1921 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1922 (_ BitVec 1))) (and (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1921)) (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_1922)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:25,203 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_1923 (_ BitVec 32))) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1923))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:25,228 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_1923 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1923)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:25,286 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_185 (_ BitVec 32)) (v_ArrVal_1923 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1923) v_nondet_tree_~n~0.base_185 (_ bv12 32)) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:25,324 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_185 (_ BitVec 32)) (v_ArrVal_1921 (_ BitVec 32)) (v_nondet_tree_~n~0.base_186 (_ BitVec 32)) (v_ArrVal_1923 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_1922 (_ BitVec 1))) (and (= (select (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_1922) v_nondet_tree_~n~0.base_186) (_ bv0 1)) (= |c_#length| (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_1921) v_nondet_tree_~n~0.base_186 v_ArrVal_1923) v_nondet_tree_~n~0.base_185 (_ bv12 32))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:25,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:33:25,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:33:25,437 INFO L321 Elim1Store]: treesize reduction 47, result has 36.5 percent of original size [2022-12-14 13:33:25,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 18 treesize of output 35 [2022-12-14 13:33:25,480 INFO L321 Elim1Store]: treesize reduction 17, result has 45.2 percent of original size [2022-12-14 13:33:25,480 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 38 [2022-12-14 13:33:25,508 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 15 trivial. 66 not checked. [2022-12-14 13:33:25,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:26,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1928121747] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:33:26,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020626249] [2022-12-14 13:33:26,519 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:33:26,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:33:26,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:33:26,520 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:33:26,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 13:33:26,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:33:26,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:33:26,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 31 conjunts are in the unsatisfiable core [2022-12-14 13:33:26,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:33:26,725 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 5 [2022-12-14 13:33:26,755 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_2043 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_2043) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:26,782 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_2043 (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_2043) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:26,878 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:26,951 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:33:26,952 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 [2022-12-14 13:33:26,960 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_nondet_tree_~n~0.base_206 (_ BitVec 32))) (and (not (= v_nondet_tree_~n~0.base_206 nondet_tree_~n~0.base)) (= (store (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) v_nondet_tree_~n~0.base_206 (_ bv12 32)) |c_#length|))) is different from true [2022-12-14 13:33:26,998 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_2043 (_ BitVec 32)) (v_nondet_tree_~n~0.base_207 (_ BitVec 32)) (v_nondet_tree_~n~0.base_206 (_ BitVec 32))) (and (= |c_#length| (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_2043) v_nondet_tree_~n~0.base_207 (_ bv12 32)) v_nondet_tree_~n~0.base_206 (_ bv12 32))) (not (= v_nondet_tree_~n~0.base_206 v_nondet_tree_~n~0.base_207)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:33:27,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:33:27,101 INFO L321 Elim1Store]: treesize reduction 53, result has 25.4 percent of original size [2022-12-14 13:33:27,101 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 31 [2022-12-14 13:33:27,114 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:33:27,115 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 [2022-12-14 13:33:27,167 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 23 trivial. 62 not checked. [2022-12-14 13:33:27,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:33:27,419 INFO L321 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-12-14 13:33:27,419 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 15 treesize of output 14 [2022-12-14 13:33:29,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2020626249] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:33:29,653 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:33:29,653 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 13] total 24 [2022-12-14 13:33:29,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081068603] [2022-12-14 13:33:29,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:33:29,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 13:33:29,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:33:29,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 13:33:29,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=99, Unknown=17, NotChecked=528, Total=702 [2022-12-14 13:33:29,654 INFO L87 Difference]: Start difference. First operand 133 states and 178 transitions. Second operand has 25 states, 24 states have (on average 3.0) internal successors, (72), 24 states have internal predecessors, (72), 14 states have call successors, (16), 3 states have call predecessors, (16), 10 states have return successors, (18), 15 states have call predecessors, (18), 13 states have call successors, (18) [2022-12-14 13:33:59,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:33:59,416 INFO L93 Difference]: Finished difference Result 163 states and 240 transitions. [2022-12-14 13:33:59,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 13:33:59,417 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.0) internal successors, (72), 24 states have internal predecessors, (72), 14 states have call successors, (16), 3 states have call predecessors, (16), 10 states have return successors, (18), 15 states have call predecessors, (18), 13 states have call successors, (18) Word has length 53 [2022-12-14 13:33:59,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:33:59,417 INFO L225 Difference]: With dead ends: 163 [2022-12-14 13:33:59,418 INFO L226 Difference]: Without dead ends: 163 [2022-12-14 13:33:59,418 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 134 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 16 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 32.5s TimeCoverageRelationStatistics Valid=143, Invalid=317, Unknown=24, NotChecked=848, Total=1332 [2022-12-14 13:33:59,418 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 79 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 558 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 2738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 558 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2139 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:33:59,418 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 109 Invalid, 2738 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 558 Invalid, 0 Unknown, 2139 Unchecked, 2.5s Time] [2022-12-14 13:33:59,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-12-14 13:33:59,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 153. [2022-12-14 13:33:59,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 103 states have (on average 1.2621359223300972) internal successors, (130), 116 states have internal predecessors, (130), 20 states have call successors, (20), 11 states have call predecessors, (20), 16 states have return successors, (65), 25 states have call predecessors, (65), 20 states have call successors, (65) [2022-12-14 13:33:59,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 215 transitions. [2022-12-14 13:33:59,424 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 215 transitions. Word has length 53 [2022-12-14 13:33:59,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:33:59,424 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 215 transitions. [2022-12-14 13:33:59,424 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.0) internal successors, (72), 24 states have internal predecessors, (72), 14 states have call successors, (16), 3 states have call predecessors, (16), 10 states have return successors, (18), 15 states have call predecessors, (18), 13 states have call successors, (18) [2022-12-14 13:33:59,424 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 215 transitions. [2022-12-14 13:33:59,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 13:33:59,424 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:33:59,425 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:33:59,429 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (35)] Ended with exit code 0 [2022-12-14 13:33:59,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:33:59,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-12-14 13:34:00,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:34:00,027 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:34:00,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:34:00,028 INFO L85 PathProgramCache]: Analyzing trace with hash -612022781, now seen corresponding path program 1 times [2022-12-14 13:34:00,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:34:00,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1622626159] [2022-12-14 13:34:00,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:34:00,029 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 [2022-12-14 13:34:00,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:34:00,030 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:34:00,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:34:00,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:34:00,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 29 conjunts are in the unsatisfiable core [2022-12-14 13:34:00,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:00,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:00,193 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:00,533 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-12-14 13:34:00,536 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-12-14 13:34:00,636 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:34:00,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:00,908 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:34:00,908 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:34:00,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1622626159] [2022-12-14 13:34:00,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1622626159] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:34:00,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1540404153] [2022-12-14 13:34:00,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:34:00,908 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:34:00,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:34:00,909 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:34:00,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2022-12-14 13:34:01,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:34:01,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 13:34:01,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:01,226 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:01,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:01,779 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:01,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:01,795 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:34:01,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:02,035 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:34:02,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1540404153] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:34:02,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676064741] [2022-12-14 13:34:02,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:34:02,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:34:02,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:34:02,037 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:34:02,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 13:34:02,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:34:02,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 13:34:02,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:02,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:02,221 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:02,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:02,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:02,520 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:34:02,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:02,807 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 13:34:02,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676064741] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:34:02,808 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:34:02,808 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 15, 13, 15, 13] total 23 [2022-12-14 13:34:02,808 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193391162] [2022-12-14 13:34:02,808 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:34:02,808 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 13:34:02,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:34:02,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 13:34:02,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2022-12-14 13:34:02,809 INFO L87 Difference]: Start difference. First operand 153 states and 215 transitions. Second operand has 23 states, 20 states have (on average 2.5) internal successors, (50), 16 states have internal predecessors, (50), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 4 states have call successors, (9) [2022-12-14 13:34:04,880 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 [0] [2022-12-14 13:34:06,925 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:34:10,302 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:34:12,428 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 [0] [2022-12-14 13:34:12,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:34:12,732 INFO L93 Difference]: Finished difference Result 263 states and 384 transitions. [2022-12-14 13:34:12,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 13:34:12,733 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 2.5) internal successors, (50), 16 states have internal predecessors, (50), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 4 states have call successors, (9) Word has length 38 [2022-12-14 13:34:12,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:34:12,734 INFO L225 Difference]: With dead ends: 263 [2022-12-14 13:34:12,734 INFO L226 Difference]: Without dead ends: 263 [2022-12-14 13:34:12,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 199 SyntacticMatches, 5 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=155, Invalid=967, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 13:34:12,735 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 111 mSDsluCounter, 1051 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 31 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 1132 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:34:12,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 1132 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 648 Invalid, 4 Unknown, 0 Unchecked, 9.5s Time] [2022-12-14 13:34:12,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2022-12-14 13:34:12,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 213. [2022-12-14 13:34:12,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 147 states have (on average 1.272108843537415) internal successors, (187), 161 states have internal predecessors, (187), 30 states have call successors, (30), 16 states have call predecessors, (30), 22 states have return successors, (114), 35 states have call predecessors, (114), 30 states have call successors, (114) [2022-12-14 13:34:12,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 331 transitions. [2022-12-14 13:34:12,743 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 331 transitions. Word has length 38 [2022-12-14 13:34:12,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:34:12,743 INFO L495 AbstractCegarLoop]: Abstraction has 213 states and 331 transitions. [2022-12-14 13:34:12,743 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 2.5) internal successors, (50), 16 states have internal predecessors, (50), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 4 states have call successors, (9) [2022-12-14 13:34:12,743 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 331 transitions. [2022-12-14 13:34:12,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-12-14 13:34:12,744 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:34:12,744 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:34:12,753 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:34:12,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2022-12-14 13:34:13,159 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 13:34:13,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:34:13,347 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:34:13,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:34:13,349 INFO L85 PathProgramCache]: Analyzing trace with hash -407980419, now seen corresponding path program 2 times [2022-12-14 13:34:13,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:34:13,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1473174864] [2022-12-14 13:34:13,350 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:34:13,350 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 [2022-12-14 13:34:13,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:34:13,351 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:34:13,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Waiting until timeout for monitored process [2022-12-14 13:34:13,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:34:13,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:34:13,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 59 conjunts are in the unsatisfiable core [2022-12-14 13:34:13,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:13,645 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 [2022-12-14 13:34:13,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:13,722 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:13,933 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_2230 (Array (_ BitVec 32) (_ BitVec 32)))) (= (store |c_old(#memory_$Pointer$.base)| nondet_tree_~n~0.base v_ArrVal_2230) |c_#memory_$Pointer$.base|)) (exists ((v_ArrVal_2229 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| nondet_tree_~n~0.base v_ArrVal_2229))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:34:13,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:13,962 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 [2022-12-14 13:34:13,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:13,971 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 [2022-12-14 13:34:13,985 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:34:13,985 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 [2022-12-14 13:34:14,020 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:34:14,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:34:14,257 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:14,259 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:14,362 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 9 not checked. [2022-12-14 13:34:14,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:16,126 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:34:16,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1473174864] [2022-12-14 13:34:16,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1473174864] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:34:16,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [928585132] [2022-12-14 13:34:16,126 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:34:16,126 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:34:16,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:34:16,127 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:34:16,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2022-12-14 13:34:16,423 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:34:16,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:34:16,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 13:34:16,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:16,437 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 [2022-12-14 13:34:16,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:16,476 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:16,629 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_2341 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| nondet_tree_~n~0.base v_ArrVal_2341))) (exists ((v_ArrVal_2342 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| nondet_tree_~n~0.base v_ArrVal_2342))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:34:16,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:16,662 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 [2022-12-14 13:34:16,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:16,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 [2022-12-14 13:34:16,685 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:34:16,686 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 [2022-12-14 13:34:16,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:34:16,703 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:34:16,780 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:16,782 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:16,794 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 9 not checked. [2022-12-14 13:34:16,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:18,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [928585132] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:34:18,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413664477] [2022-12-14 13:34:18,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:34:18,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:34:18,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:34:18,392 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:34:18,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 13:34:18,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:34:18,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:34:18,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 13:34:18,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:18,689 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:18,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:34:18,854 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_2452 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| nondet_tree_~n~0.base v_ArrVal_2452))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (exists ((v_ArrVal_2453 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| nondet_tree_~n~0.base v_ArrVal_2453))))) is different from true [2022-12-14 13:34:18,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:18,883 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 [2022-12-14 13:34:18,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:18,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 [2022-12-14 13:34:18,901 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:34:18,901 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 [2022-12-14 13:34:18,912 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:34:18,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:34:19,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:19,024 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:34:19,036 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 7 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 9 not checked. [2022-12-14 13:34:19,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:20,249 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (bvadd (_ bv4 32) c_nondet_tree_~n~0.offset))) (and (forall ((v_nondet_tree_~n~0.base_274 (_ BitVec 32))) (or (not (= (_ bv0 1) (select |c_#valid| v_nondet_tree_~n~0.base_274))) (forall ((v_ArrVal_2495 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.offset| v_nondet_tree_~n~0.base_274 v_ArrVal_2495) c_nondet_tree_~n~0.base) .cse0) (_ bv0 32))))) (forall ((v_nondet_tree_~n~0.base_274 (_ BitVec 32))) (or (not (= (_ bv0 1) (select |c_#valid| v_nondet_tree_~n~0.base_274))) (forall ((v_ArrVal_2494 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.base| v_nondet_tree_~n~0.base_274 v_ArrVal_2494) c_nondet_tree_~n~0.base) .cse0) (_ bv0 32))))))) is different from false [2022-12-14 13:34:20,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1413664477] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:34:20,251 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:34:20,252 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 20] total 26 [2022-12-14 13:34:20,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711563325] [2022-12-14 13:34:20,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:34:20,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 13:34:20,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:34:20,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 13:34:20,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=791, Unknown=8, NotChecked=236, Total=1122 [2022-12-14 13:34:20,253 INFO L87 Difference]: Start difference. First operand 213 states and 331 transitions. Second operand has 26 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 19 states have internal predecessors, (43), 7 states have call successors, (8), 6 states have call predecessors, (8), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-12-14 13:34:22,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:34:22,784 INFO L93 Difference]: Finished difference Result 243 states and 370 transitions. [2022-12-14 13:34:22,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 13:34:22,785 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 19 states have internal predecessors, (43), 7 states have call successors, (8), 6 states have call predecessors, (8), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 45 [2022-12-14 13:34:22,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:34:22,786 INFO L225 Difference]: With dead ends: 243 [2022-12-14 13:34:22,786 INFO L226 Difference]: Without dead ends: 243 [2022-12-14 13:34:22,786 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 144 SyntacticMatches, 7 SemanticMatches, 48 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=225, Invalid=1851, Unknown=10, NotChecked=364, Total=2450 [2022-12-14 13:34:22,787 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 231 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 1062 mSolverCounterSat, 82 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 1487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 1062 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 339 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:34:22,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [237 Valid, 178 Invalid, 1487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 1062 Invalid, 4 Unknown, 339 Unchecked, 1.5s Time] [2022-12-14 13:34:22,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2022-12-14 13:34:22,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 233. [2022-12-14 13:34:22,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 162 states have (on average 1.2592592592592593) internal successors, (204), 176 states have internal predecessors, (204), 33 states have call successors, (33), 18 states have call predecessors, (33), 24 states have return successors, (117), 38 states have call predecessors, (117), 33 states have call successors, (117) [2022-12-14 13:34:22,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 354 transitions. [2022-12-14 13:34:22,794 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 354 transitions. Word has length 45 [2022-12-14 13:34:22,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:34:22,794 INFO L495 AbstractCegarLoop]: Abstraction has 233 states and 354 transitions. [2022-12-14 13:34:22,794 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 19 states have internal predecessors, (43), 7 states have call successors, (8), 6 states have call predecessors, (8), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-12-14 13:34:22,794 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 354 transitions. [2022-12-14 13:34:22,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-12-14 13:34:22,795 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:34:22,795 INFO L195 NwaCegarLoop]: trace histogram [9, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 1, 1, 1, 1] [2022-12-14 13:34:22,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-12-14 13:34:23,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2022-12-14 13:34:23,228 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:34:23,397 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:34:23,398 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:34:23,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:34:23,398 INFO L85 PathProgramCache]: Analyzing trace with hash -1223570978, now seen corresponding path program 3 times [2022-12-14 13:34:23,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:34:23,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1692210212] [2022-12-14 13:34:23,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:34:23,399 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 [2022-12-14 13:34:23,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:34:23,400 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:34:23,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:34:24,100 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 13:34:24,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:34:24,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 13:34:24,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:24,125 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 5 [2022-12-14 13:34:24,215 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_2647 (_ BitVec 32))) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_2647))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:34:24,247 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_2647 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_2647)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:34:24,265 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 [2022-12-14 13:34:24,308 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:34:24,388 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:34:24,388 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 [2022-12-14 13:34:24,398 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_275 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= (store (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) v_nondet_tree_~n~0.base_275 (_ bv12 32)) |c_#length|) (not (= v_nondet_tree_~n~0.base_275 nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:34:24,460 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_276 (_ BitVec 32)) (v_ArrVal_2647 (_ BitVec 32)) (v_nondet_tree_~n~0.base_275 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= (select |c_old(#valid)| v_nondet_tree_~n~0.base_276) (_ bv0 1)) (= (store (store (store |c_old(#length)| v_nondet_tree_~n~0.base_276 v_ArrVal_2647) nondet_tree_~n~0.base (_ bv12 32)) v_nondet_tree_~n~0.base_275 (_ bv12 32)) |c_#length|) (not (= v_nondet_tree_~n~0.base_275 nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:34:24,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:24,565 INFO L321 Elim1Store]: treesize reduction 53, result has 25.4 percent of original size [2022-12-14 13:34:24,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 31 [2022-12-14 13:34:24,582 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:34:24,582 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 [2022-12-14 13:34:24,647 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 86 proven. 24 refuted. 0 times theorem prover too weak. 34 trivial. 78 not checked. [2022-12-14 13:34:24,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:24,943 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 10 treesize of output 8 [2022-12-14 13:34:26,998 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (bvadd (_ bv12 32) c_nondet_tree_~n~0.offset))) (and (or (forall ((v_nondet_tree_~n~0.base_294 (_ BitVec 32))) (not (= (_ bv0 1) (select |c_#valid| v_nondet_tree_~n~0.base_294)))) (bvule (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset) .cse0)) (forall ((v_nondet_tree_~n~0.base_294 (_ BitVec 32))) (or (not (= (_ bv0 1) (select |c_#valid| v_nondet_tree_~n~0.base_294))) (forall ((v_nondet_tree_~n~0.base_295 (_ BitVec 32)) (v_nondet_tree_~n~0.base_293 (_ BitVec 32))) (or (= v_nondet_tree_~n~0.base_293 v_nondet_tree_~n~0.base_295) (forall ((v_ArrVal_2656 (_ BitVec 32))) (bvule .cse0 (select (store (store (store |c_#length| v_nondet_tree_~n~0.base_294 v_ArrVal_2656) v_nondet_tree_~n~0.base_295 (_ bv12 32)) v_nondet_tree_~n~0.base_293 (_ bv12 32)) c_nondet_tree_~n~0.base))))))))) is different from false [2022-12-14 13:34:27,005 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:34:27,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1692210212] [2022-12-14 13:34:27,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1692210212] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:34:27,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1734659269] [2022-12-14 13:34:27,005 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:34:27,005 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:34:27,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:34:27,006 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:34:27,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2022-12-14 13:34:28,063 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 13:34:28,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:34:28,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 47 conjunts are in the unsatisfiable core [2022-12-14 13:34:28,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:28,081 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 5 [2022-12-14 13:34:36,789 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_2810 (_ BitVec 32)) (v_ArrVal_2812 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_2808 (_ BitVec 32)) (|nondet_tree_#t~ret8.base| (_ BitVec 32))) (let ((.cse0 (store |c_old(#valid)| nondet_tree_~n~0.base (_ bv1 1)))) (and (= (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_2808) |c_nondet_tree_#t~ret9.base| v_ArrVal_2810) |nondet_tree_#t~ret8.base| v_ArrVal_2812) |c_#length|) (= (_ bv0 1) (select .cse0 |c_nondet_tree_#t~ret9.base|)) (= (_ bv0 1) (select (store .cse0 |c_nondet_tree_#t~ret9.base| (_ bv1 1)) |nondet_tree_#t~ret8.base|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base))))) is different from true [2022-12-14 13:34:36,819 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_2810 (_ BitVec 32)) (v_ArrVal_2812 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (|nondet_tree_#t~ret9.base| (_ BitVec 32)) (v_ArrVal_2808 (_ BitVec 32)) (|nondet_tree_#t~ret8.base| (_ BitVec 32))) (let ((.cse0 (store |c_old(#valid)| nondet_tree_~n~0.base (_ bv1 1)))) (and (= (_ bv0 1) (select .cse0 |nondet_tree_#t~ret9.base|)) (= (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_2808) |nondet_tree_#t~ret9.base| v_ArrVal_2810) |nondet_tree_#t~ret8.base| v_ArrVal_2812) |c_#length|) (= (_ bv0 1) (select (store .cse0 |nondet_tree_#t~ret9.base| (_ bv1 1)) |nondet_tree_#t~ret8.base|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base))))) is different from true [2022-12-14 13:34:36,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:36,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:36,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:36,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:36,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:36,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:36,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 24 [2022-12-14 13:34:36,919 INFO L321 Elim1Store]: treesize reduction 48, result has 21.3 percent of original size [2022-12-14 13:34:36,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 39 [2022-12-14 13:34:36,927 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 87 proven. 82 refuted. 4 times theorem prover too weak. 30 trivial. 19 not checked. [2022-12-14 13:34:36,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:34:39,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1734659269] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:34:39,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298807399] [2022-12-14 13:34:39,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:34:39,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:34:39,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:34:39,783 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:34:39,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-12-14 13:34:46,078 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 13:34:46,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:34:46,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 13:34:46,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:34:46,097 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 5 [2022-12-14 13:34:50,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:50,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:50,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:50,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:50,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:50,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:34:50,915 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 24 [2022-12-14 13:34:50,968 INFO L321 Elim1Store]: treesize reduction 48, result has 21.3 percent of original size [2022-12-14 13:34:50,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 39 [2022-12-14 13:34:51,120 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 90 proven. 61 refuted. 0 times theorem prover too weak. 34 trivial. 37 not checked. [2022-12-14 13:34:51,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:35:04,182 WARN L233 SmtUtils]: Spent 6.41s on a formula simplification that was a NOOP. DAG size: 40 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:35:04,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298807399] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:35:04,183 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:35:04,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 11] total 27 [2022-12-14 13:35:04,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476362500] [2022-12-14 13:35:04,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:35:04,185 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 13:35:04,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:35:04,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 13:35:04,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=484, Unknown=16, NotChecked=408, Total=992 [2022-12-14 13:35:04,186 INFO L87 Difference]: Start difference. First operand 233 states and 354 transitions. Second operand has 28 states, 27 states have (on average 3.2222222222222223) internal successors, (87), 24 states have internal predecessors, (87), 16 states have call successors, (22), 3 states have call predecessors, (22), 11 states have return successors, (22), 17 states have call predecessors, (22), 16 states have call successors, (22) [2022-12-14 13:35:06,344 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 [0] [2022-12-14 13:35:10,669 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:12,987 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:15,201 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:19,900 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:21,981 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:26,095 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:28,145 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:30,245 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:32,381 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:36,565 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:38,571 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:42,793 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:44,862 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:46,869 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:48,893 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:50,928 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:52,936 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:35:59,259 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:36:01,264 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:36:05,919 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:36:08,464 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:36:12,707 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:36:14,811 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:36:21,171 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:36:23,176 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 [0] [2022-12-14 13:36:31,161 WARN L233 SmtUtils]: Spent 5.59s on a formula simplification. DAG size of input: 69 DAG size of output: 52 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:36:47,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:36:47,847 INFO L93 Difference]: Finished difference Result 288 states and 557 transitions. [2022-12-14 13:36:47,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 13:36:47,848 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 3.2222222222222223) internal successors, (87), 24 states have internal predecessors, (87), 16 states have call successors, (22), 3 states have call predecessors, (22), 11 states have return successors, (22), 17 states have call predecessors, (22), 16 states have call successors, (22) Word has length 73 [2022-12-14 13:36:47,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:36:47,850 INFO L225 Difference]: With dead ends: 288 [2022-12-14 13:36:47,850 INFO L226 Difference]: Without dead ends: 288 [2022-12-14 13:36:47,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 198 SyntacticMatches, 9 SemanticMatches, 43 ConstructedPredicates, 8 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 66.2s TimeCoverageRelationStatistics Valid=237, Invalid=1104, Unknown=23, NotChecked=616, Total=1980 [2022-12-14 13:36:47,851 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 143 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 1619 mSolverCounterSat, 94 mSolverCounterUnsat, 71 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 66.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 2748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 1619 IncrementalHoareTripleChecker+Invalid, 71 IncrementalHoareTripleChecker+Unknown, 964 IncrementalHoareTripleChecker+Unchecked, 67.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:36:47,851 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 247 Invalid, 2748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 1619 Invalid, 71 Unknown, 964 Unchecked, 67.4s Time] [2022-12-14 13:36:47,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2022-12-14 13:36:47,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 272. [2022-12-14 13:36:47,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 189 states have (on average 1.2328042328042328) internal successors, (233), 205 states have internal predecessors, (233), 40 states have call successors, (40), 20 states have call predecessors, (40), 29 states have return successors, (208), 46 states have call predecessors, (208), 40 states have call successors, (208) [2022-12-14 13:36:47,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 481 transitions. [2022-12-14 13:36:47,870 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 481 transitions. Word has length 73 [2022-12-14 13:36:47,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:36:47,870 INFO L495 AbstractCegarLoop]: Abstraction has 272 states and 481 transitions. [2022-12-14 13:36:47,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 3.2222222222222223) internal successors, (87), 24 states have internal predecessors, (87), 16 states have call successors, (22), 3 states have call predecessors, (22), 11 states have return successors, (22), 17 states have call predecessors, (22), 16 states have call successors, (22) [2022-12-14 13:36:47,870 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 481 transitions. [2022-12-14 13:36:47,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-12-14 13:36:47,871 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:36:47,871 INFO L195 NwaCegarLoop]: trace histogram [11, 7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1] [2022-12-14 13:36:47,888 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:36:48,090 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (44)] Ended with exit code 0 [2022-12-14 13:36:48,291 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-12-14 13:36:48,473 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:36:48,474 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:36:48,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:36:48,475 INFO L85 PathProgramCache]: Analyzing trace with hash 1542291666, now seen corresponding path program 4 times [2022-12-14 13:36:48,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:36:48,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [353298303] [2022-12-14 13:36:48,477 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:36:48,477 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 [2022-12-14 13:36:48,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:36:48,480 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:36:48,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:36:48,979 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:36:48,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:36:48,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 13:36:49,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:36:49,011 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 [2022-12-14 13:36:49,025 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 5 [2022-12-14 13:36:49,309 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_3179 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3179) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:36:49,415 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3179 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3179) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:36:49,776 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) |c_#length|)) is different from true [2022-12-14 13:36:49,992 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_nondet_tree_~n~0.base_336 (_ BitVec 32)) (v_ArrVal_3180 (_ BitVec 32))) (and (= (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3180) v_nondet_tree_~n~0.base_336 (_ bv12 32)) |c_#length|) (bvule (_ bv12 32) (select |c_#length| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:36:50,247 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_3183 (_ BitVec 32)) (v_nondet_tree_~n~0.base_336 (_ BitVec 32)) (v_ArrVal_3180 (_ BitVec 32)) (v_nondet_tree_~n~0.base_337 (_ BitVec 32))) (and (bvule (_ bv12 32) (select |c_#length| v_nondet_tree_~n~0.base_337)) (= |c_#length| (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3183) v_nondet_tree_~n~0.base_337 v_ArrVal_3180) v_nondet_tree_~n~0.base_336 (_ bv12 32))) (bvule (_ bv12 32) (select |c_#length| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:36:50,371 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3179 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_3183 (_ BitVec 32)) (v_nondet_tree_~n~0.base_336 (_ BitVec 32)) (v_ArrVal_3180 (_ BitVec 32)) (v_nondet_tree_~n~0.base_337 (_ BitVec 32)) (v_nondet_tree_~n~0.base_338 (_ BitVec 32))) (and (= (store (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3179) v_nondet_tree_~n~0.base_338 v_ArrVal_3183) v_nondet_tree_~n~0.base_337 v_ArrVal_3180) v_nondet_tree_~n~0.base_336 (_ bv12 32)) |c_#length|) (bvule (_ bv12 32) (select |c_#length| v_nondet_tree_~n~0.base_337)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (bvule (_ bv12 32) (select |c_#length| v_nondet_tree_~n~0.base_338)))) is different from true [2022-12-14 13:36:50,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:36:50,978 INFO L321 Elim1Store]: treesize reduction 114, result has 30.1 percent of original size [2022-12-14 13:36:50,978 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 21 treesize of output 57 [2022-12-14 13:36:51,035 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:36:51,035 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 [2022-12-14 13:36:51,331 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 105 proven. 39 refuted. 2 times theorem prover too weak. 64 trivial. 115 not checked. [2022-12-14 13:36:51,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:36:53,159 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:36:53,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [353298303] [2022-12-14 13:36:53,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [353298303] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:36:53,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1398976166] [2022-12-14 13:36:53,159 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:36:53,159 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:36:53,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:36:53,160 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:36:53,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2022-12-14 13:36:54,088 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:36:54,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:36:54,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 49 conjunts are in the unsatisfiable core [2022-12-14 13:36:54,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:36:54,115 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-12-14 13:36:54,130 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 [2022-12-14 13:36:54,370 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_3384 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3384) |c_#length|)) (exists ((v_ArrVal_3385 (_ BitVec 1))) (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_3385))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:36:54,506 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3384 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_3385 (_ BitVec 1))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3384) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_3385)))) is different from true [2022-12-14 13:36:54,814 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3386 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3386) |c_#length|) (= (store |c_old(#valid)| nondet_tree_~n~0.base (_ bv1 1)) |c_#valid|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:36:54,909 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_3388 (_ BitVec 32))) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3388))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:36:54,992 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3388 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3388)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:36:55,186 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3388 (_ BitVec 32)) (v_nondet_tree_~n~0.base_370 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= (_ bv0 1) (select |c_old(#valid)| v_nondet_tree_~n~0.base_370)) (= |c_#length| (store (store |c_old(#length)| v_nondet_tree_~n~0.base_370 v_ArrVal_3388) nondet_tree_~n~0.base (_ bv12 32))))) is different from true [2022-12-14 13:36:55,277 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3388 (_ BitVec 32)) (v_nondet_tree_~n~0.base_371 (_ BitVec 32)) (v_ArrVal_3386 (_ BitVec 32)) (v_nondet_tree_~n~0.base_370 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= |c_#length| (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3386) v_nondet_tree_~n~0.base_370 v_ArrVal_3388) v_nondet_tree_~n~0.base_371 (_ bv12 32))) (= (select (store |c_old(#valid)| nondet_tree_~n~0.base (_ bv1 1)) v_nondet_tree_~n~0.base_370) (_ bv0 1)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:36:55,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:36:55,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:36:55,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:36:55,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:36:56,041 INFO L321 Elim1Store]: treesize reduction 73, result has 34.8 percent of original size [2022-12-14 13:36:56,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 21 treesize of output 47 [2022-12-14 13:36:56,275 INFO L321 Elim1Store]: treesize reduction 38, result has 37.7 percent of original size [2022-12-14 13:36:56,275 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 69 treesize of output 83 [2022-12-14 13:36:56,518 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 105 proven. 58 refuted. 0 times theorem prover too weak. 42 trivial. 120 not checked. [2022-12-14 13:36:56,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:37:11,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1398976166] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:37:11,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19381268] [2022-12-14 13:37:11,523 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:37:11,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:37:11,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:37:11,524 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:37:11,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-12-14 13:37:11,820 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:37:11,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:37:11,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 45 conjunts are in the unsatisfiable core [2022-12-14 13:37:11,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:37:11,840 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 5 [2022-12-14 13:37:12,008 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_3594 (_ BitVec 1))) (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_3594))) (exists ((v_ArrVal_3593 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3593) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:37:12,129 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3593 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_3594 (_ BitVec 1))) (and (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3593) |c_#length|) (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_3594)))) is different from true [2022-12-14 13:37:12,229 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_3596 (_ BitVec 1))) (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_3596))) (exists ((v_ArrVal_3595 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3595) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:37:12,351 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3595 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_3596 (_ BitVec 1))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3595) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)) (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_3596)))) is different from true [2022-12-14 13:37:12,439 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_3597 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3597) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:37:12,517 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3597 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3597) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:37:12,702 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3597 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_nondet_tree_~n~0.base_404 (_ BitVec 32))) (and (= (store (store |c_old(#length)| v_nondet_tree_~n~0.base_404 v_ArrVal_3597) nondet_tree_~n~0.base (_ bv12 32)) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| v_nondet_tree_~n~0.base_404)))) is different from true [2022-12-14 13:37:12,795 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3597 (_ BitVec 32)) (v_ArrVal_3595 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_3596 (_ BitVec 1)) (v_nondet_tree_~n~0.base_405 (_ BitVec 32)) (v_nondet_tree_~n~0.base_404 (_ BitVec 32))) (and (= (_ bv0 1) (select (store |c_old(#valid)| v_nondet_tree_~n~0.base_405 v_ArrVal_3596) v_nondet_tree_~n~0.base_404)) (= (_ bv0 1) (select |c_old(#valid)| v_nondet_tree_~n~0.base_405)) (= (store (store (store |c_old(#length)| v_nondet_tree_~n~0.base_405 v_ArrVal_3595) v_nondet_tree_~n~0.base_404 v_ArrVal_3597) nondet_tree_~n~0.base (_ bv12 32)) |c_#length|))) is different from true [2022-12-14 13:37:12,939 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_3597 (_ BitVec 32)) (v_ArrVal_3595 (_ BitVec 32)) (v_ArrVal_3593 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_3596 (_ BitVec 1)) (v_nondet_tree_~n~0.base_405 (_ BitVec 32)) (v_nondet_tree_~n~0.base_406 (_ BitVec 32)) (v_nondet_tree_~n~0.base_404 (_ BitVec 32)) (v_ArrVal_3594 (_ BitVec 1))) (let ((.cse0 (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_3594))) (and (= (select (store .cse0 v_nondet_tree_~n~0.base_405 v_ArrVal_3596) v_nondet_tree_~n~0.base_404) (_ bv0 1)) (= (_ bv0 1) (select .cse0 v_nondet_tree_~n~0.base_405)) (= (store (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_3593) v_nondet_tree_~n~0.base_405 v_ArrVal_3595) v_nondet_tree_~n~0.base_404 v_ArrVal_3597) v_nondet_tree_~n~0.base_406 (_ bv12 32)) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base))))) is different from true [2022-12-14 13:37:13,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:37:13,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:37:13,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:37:13,440 INFO L321 Elim1Store]: treesize reduction 86, result has 32.8 percent of original size [2022-12-14 13:37:13,440 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 21 treesize of output 50 [2022-12-14 13:37:13,667 INFO L321 Elim1Store]: treesize reduction 38, result has 37.7 percent of original size [2022-12-14 13:37:13,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 75 treesize of output 89 [2022-12-14 13:37:13,934 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 114 proven. 32 refuted. 0 times theorem prover too weak. 43 trivial. 136 not checked. [2022-12-14 13:37:13,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:37:17,315 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (bvadd (_ bv12 32) c_nondet_tree_~n~0.offset))) (and (or (bvule (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset) .cse0) (forall ((v_ArrVal_3625 (_ BitVec 1)) (v_ArrVal_3623 (_ BitVec 1)) (v_nondet_tree_~n~0.base_434 (_ BitVec 32)) (v_nondet_tree_~n~0.base_435 (_ BitVec 32)) (v_nondet_tree_~n~0.base_437 (_ BitVec 32))) (let ((.cse1 (store |c_#valid| v_nondet_tree_~n~0.base_434 v_ArrVal_3625))) (or (not (= (_ bv0 1) (select |c_#valid| v_nondet_tree_~n~0.base_434))) (not (= (_ bv0 1) (select (store .cse1 v_nondet_tree_~n~0.base_437 v_ArrVal_3623) v_nondet_tree_~n~0.base_435))) (not (= (select .cse1 v_nondet_tree_~n~0.base_437) (_ bv0 1))))))) (forall ((v_nondet_tree_~n~0.base_434 (_ BitVec 32))) (or (forall ((v_ArrVal_3625 (_ BitVec 1)) (v_nondet_tree_~n~0.base_437 (_ BitVec 32))) (let ((.cse2 (store |c_#valid| v_nondet_tree_~n~0.base_434 v_ArrVal_3625))) (or (forall ((v_ArrVal_3623 (_ BitVec 1)) (v_nondet_tree_~n~0.base_435 (_ BitVec 32))) (or (forall ((v_ArrVal_3626 (_ BitVec 32)) (v_ArrVal_3624 (_ BitVec 32)) (v_nondet_tree_~n~0.base_436 (_ BitVec 32)) (v_ArrVal_3622 (_ BitVec 32))) (bvule .cse0 (select (store (store (store (store |c_#length| v_nondet_tree_~n~0.base_434 v_ArrVal_3624) v_nondet_tree_~n~0.base_437 v_ArrVal_3622) v_nondet_tree_~n~0.base_435 v_ArrVal_3626) v_nondet_tree_~n~0.base_436 (_ bv12 32)) c_nondet_tree_~n~0.base))) (not (= (_ bv0 1) (select (store .cse2 v_nondet_tree_~n~0.base_437 v_ArrVal_3623) v_nondet_tree_~n~0.base_435))))) (not (= (select .cse2 v_nondet_tree_~n~0.base_437) (_ bv0 1)))))) (not (= (_ bv0 1) (select |c_#valid| v_nondet_tree_~n~0.base_434))))))) is different from false [2022-12-14 13:37:17,325 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19381268] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:37:17,325 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:37:17,325 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 33 [2022-12-14 13:37:17,325 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293794601] [2022-12-14 13:37:17,325 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:37:17,325 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 13:37:17,326 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:37:17,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 13:37:17,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=183, Unknown=35, NotChecked=1104, Total=1406 [2022-12-14 13:37:17,327 INFO L87 Difference]: Start difference. First operand 272 states and 481 transitions. Second operand has 34 states, 33 states have (on average 3.0) internal successors, (99), 31 states have internal predecessors, (99), 19 states have call successors, (24), 3 states have call predecessors, (24), 13 states have return successors, (25), 22 states have call predecessors, (25), 19 states have call successors, (25) [2022-12-14 13:37:19,418 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 [0] [2022-12-14 13:37:23,705 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:25,719 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:27,739 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:29,825 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:33,978 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:35,990 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:38,012 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:40,067 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:44,167 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:48,272 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:50,285 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:55,709 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:37:58,060 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:38:02,548 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:38:06,174 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:38:10,913 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.66s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:38:12,952 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:38:25,430 WARN L233 SmtUtils]: Spent 6.33s on a formula simplification. DAG size of input: 58 DAG size of output: 49 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:38:27,481 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:38:36,454 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:38:38,485 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:38:53,039 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:38:55,114 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:39:22,711 WARN L233 SmtUtils]: Spent 7.09s on a formula simplification. DAG size of input: 67 DAG size of output: 51 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:39:24,846 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:39:42,179 WARN L233 SmtUtils]: Spent 6.75s on a formula simplification. DAG size of input: 74 DAG size of output: 55 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:39:44,225 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:39:46,387 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:39:48,394 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:39:49,673 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:40:18,470 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:40:20,532 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:40:22,718 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:40:25,395 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:40:27,410 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:41:02,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:41:02,046 INFO L93 Difference]: Finished difference Result 311 states and 692 transitions. [2022-12-14 13:41:02,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 13:41:02,048 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 3.0) internal successors, (99), 31 states have internal predecessors, (99), 19 states have call successors, (24), 3 states have call predecessors, (24), 13 states have return successors, (25), 22 states have call predecessors, (25), 19 states have call successors, (25) Word has length 87 [2022-12-14 13:41:02,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:41:02,051 INFO L225 Difference]: With dead ends: 311 [2022-12-14 13:41:02,051 INFO L226 Difference]: Without dead ends: 311 [2022-12-14 13:41:02,051 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 232 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 23 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 163.3s TimeCoverageRelationStatistics Valid=211, Invalid=507, Unknown=76, NotChecked=1656, Total=2450 [2022-12-14 13:41:02,052 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 120 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 66 mSolverCounterUnsat, 88 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 77.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 4233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 88 IncrementalHoareTripleChecker+Unknown, 3274 IncrementalHoareTripleChecker+Unchecked, 78.7s IncrementalHoareTripleChecker+Time [2022-12-14 13:41:02,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 121 Invalid, 4233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 805 Invalid, 88 Unknown, 3274 Unchecked, 78.7s Time] [2022-12-14 13:41:02,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2022-12-14 13:41:02,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 290. [2022-12-14 13:41:02,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 202 states have (on average 1.2178217821782178) internal successors, (246), 218 states have internal predecessors, (246), 42 states have call successors, (42), 20 states have call predecessors, (42), 32 states have return successors, (295), 51 states have call predecessors, (295), 42 states have call successors, (295) [2022-12-14 13:41:02,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 583 transitions. [2022-12-14 13:41:02,074 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 583 transitions. Word has length 87 [2022-12-14 13:41:02,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:41:02,074 INFO L495 AbstractCegarLoop]: Abstraction has 290 states and 583 transitions. [2022-12-14 13:41:02,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 3.0) internal successors, (99), 31 states have internal predecessors, (99), 19 states have call successors, (24), 3 states have call predecessors, (24), 13 states have return successors, (25), 22 states have call predecessors, (25), 19 states have call successors, (25) [2022-12-14 13:41:02,074 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 583 transitions. [2022-12-14 13:41:02,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-12-14 13:41:02,075 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:41:02,075 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:41:02,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-12-14 13:41:02,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2022-12-14 13:41:02,491 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:41:02,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:41:02,678 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:41:02,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:41:02,679 INFO L85 PathProgramCache]: Analyzing trace with hash -1293875203, now seen corresponding path program 3 times [2022-12-14 13:41:02,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:41:02,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [547655963] [2022-12-14 13:41:02,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:41:02,681 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 [2022-12-14 13:41:02,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:41:02,684 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:41:02,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:41:02,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 13:41:02,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:41:02,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 13:41:02,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:41:03,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:41:03,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 27 treesize of output 26 [2022-12-14 13:41:03,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2022-12-14 13:41:04,056 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 22 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 13:41:04,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:41:05,627 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 13:41:05,627 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:41:05,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [547655963] [2022-12-14 13:41:05,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [547655963] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:41:05,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [305388806] [2022-12-14 13:41:05,628 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:41:05,628 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:41:05,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:41:05,629 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:41:05,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2022-12-14 13:41:05,999 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 13:41:05,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:41:06,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 13:41:06,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:41:06,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:41:06,665 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 27 treesize of output 26 [2022-12-14 13:41:07,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2022-12-14 13:41:07,677 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 13:41:07,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:41:09,233 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 13:41:09,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [305388806] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:41:09,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919479717] [2022-12-14 13:41:09,234 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:41:09,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:41:09,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:41:09,235 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:41:09,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-12-14 13:41:09,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 13:41:09,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:41:09,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 29 conjunts are in the unsatisfiable core [2022-12-14 13:41:09,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:41:09,610 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:41:09,723 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 27 treesize of output 26 [2022-12-14 13:41:10,049 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2022-12-14 13:41:10,076 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 20 proven. 13 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 13:41:10,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:41:11,021 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 13:41:11,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919479717] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:41:11,022 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:41:11,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 16, 15, 15, 14] total 25 [2022-12-14 13:41:11,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514555053] [2022-12-14 13:41:11,022 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:41:11,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 13:41:11,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:41:11,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 13:41:11,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=588, Unknown=0, NotChecked=0, Total=650 [2022-12-14 13:41:11,025 INFO L87 Difference]: Start difference. First operand 290 states and 583 transitions. Second operand has 26 states, 22 states have (on average 2.409090909090909) internal successors, (53), 19 states have internal predecessors, (53), 8 states have call successors, (14), 8 states have call predecessors, (14), 8 states have return successors, (13), 8 states have call predecessors, (13), 5 states have call successors, (13) [2022-12-14 13:41:20,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:41:20,961 INFO L93 Difference]: Finished difference Result 317 states and 621 transitions. [2022-12-14 13:41:20,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 13:41:20,962 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 2.409090909090909) internal successors, (53), 19 states have internal predecessors, (53), 8 states have call successors, (14), 8 states have call predecessors, (14), 8 states have return successors, (13), 8 states have call predecessors, (13), 5 states have call successors, (13) Word has length 45 [2022-12-14 13:41:20,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:41:20,964 INFO L225 Difference]: With dead ends: 317 [2022-12-14 13:41:20,964 INFO L226 Difference]: Without dead ends: 317 [2022-12-14 13:41:20,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 239 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=201, Invalid=1439, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 13:41:20,965 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 264 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 1966 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 2063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 1966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:41:20,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 262 Invalid, 2063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 1966 Invalid, 0 Unknown, 0 Unchecked, 8.3s Time] [2022-12-14 13:41:20,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2022-12-14 13:41:20,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 304. [2022-12-14 13:41:20,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 213 states have (on average 1.2347417840375587) internal successors, (263), 229 states have internal predecessors, (263), 44 states have call successors, (44), 21 states have call predecessors, (44), 33 states have return successors, (297), 53 states have call predecessors, (297), 44 states have call successors, (297) [2022-12-14 13:41:20,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 604 transitions. [2022-12-14 13:41:20,979 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 604 transitions. Word has length 45 [2022-12-14 13:41:20,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:41:20,980 INFO L495 AbstractCegarLoop]: Abstraction has 304 states and 604 transitions. [2022-12-14 13:41:20,980 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 2.409090909090909) internal successors, (53), 19 states have internal predecessors, (53), 8 states have call successors, (14), 8 states have call predecessors, (14), 8 states have return successors, (13), 8 states have call predecessors, (13), 5 states have call successors, (13) [2022-12-14 13:41:20,980 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 604 transitions. [2022-12-14 13:41:20,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-12-14 13:41:20,981 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:41:20,981 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:41:20,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (50)] Forceful destruction successful, exit code 0 [2022-12-14 13:41:21,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:41:21,390 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2022-12-14 13:41:21,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:41:21,583 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:41:21,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:41:21,584 INFO L85 PathProgramCache]: Analyzing trace with hash -1293875202, now seen corresponding path program 1 times [2022-12-14 13:41:21,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:41:21,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1712259054] [2022-12-14 13:41:21,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:41:21,586 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 [2022-12-14 13:41:21,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:41:21,589 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:41:21,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:41:21,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:41:21,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 13:41:21,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:41:21,877 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 5 [2022-12-14 13:41:22,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:41:22,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:41:22,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 13:41:22,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:41:23,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 21 treesize of output 9 [2022-12-14 13:41:23,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-12-14 13:41:23,587 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 13:41:23,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:41:31,868 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 13:41:31,868 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:41:31,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1712259054] [2022-12-14 13:41:31,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1712259054] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:41:31,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1391945671] [2022-12-14 13:41:31,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:41:31,869 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:41:31,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:41:31,870 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:41:31,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2022-12-14 13:41:32,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:41:32,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 47 conjunts are in the unsatisfiable core [2022-12-14 13:41:32,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:41:32,478 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 5 [2022-12-14 13:41:32,900 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:41:32,916 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:41:33,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 25 treesize of output 24 [2022-12-14 13:41:33,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:41:34,927 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-12-14 13:41:34,935 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:41:34,995 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 13:41:34,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:41:40,475 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 13:41:40,475 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1391945671] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:41:40,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989802652] [2022-12-14 13:41:40,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:41:40,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:41:40,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:41:40,476 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:41:40,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-12-14 13:41:40,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:41:40,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 47 conjunts are in the unsatisfiable core [2022-12-14 13:41:40,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:41:40,701 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 5 [2022-12-14 13:41:40,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:41:40,943 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:41:41,079 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 22 [2022-12-14 13:41:41,095 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 25 treesize of output 24 [2022-12-14 13:41:41,564 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-12-14 13:41:41,571 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:41:41,627 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 13:41:41,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:41:47,349 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 13:41:47,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989802652] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:41:47,350 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:41:47,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 16, 15, 16, 15] total 37 [2022-12-14 13:41:47,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813705737] [2022-12-14 13:41:47,350 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:41:47,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 13:41:47,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:41:47,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 13:41:47,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1300, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 13:41:47,351 INFO L87 Difference]: Start difference. First operand 304 states and 604 transitions. Second operand has 38 states, 32 states have (on average 2.21875) internal successors, (71), 27 states have internal predecessors, (71), 12 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 11 states have call predecessors, (13), 7 states have call successors, (13) [2022-12-14 13:42:11,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:42:11,421 INFO L93 Difference]: Finished difference Result 351 states and 666 transitions. [2022-12-14 13:42:11,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 13:42:11,423 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 32 states have (on average 2.21875) internal successors, (71), 27 states have internal predecessors, (71), 12 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 11 states have call predecessors, (13), 7 states have call successors, (13) Word has length 45 [2022-12-14 13:42:11,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:42:11,425 INFO L225 Difference]: With dead ends: 351 [2022-12-14 13:42:11,425 INFO L226 Difference]: Without dead ends: 351 [2022-12-14 13:42:11,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 220 SyntacticMatches, 8 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 892 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=365, Invalid=3541, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 13:42:11,426 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 279 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 2967 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 3079 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 2967 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:42:11,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [281 Valid, 411 Invalid, 3079 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 2967 Invalid, 0 Unknown, 0 Unchecked, 16.4s Time] [2022-12-14 13:42:11,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2022-12-14 13:42:11,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 334. [2022-12-14 13:42:11,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 236 states have (on average 1.228813559322034) internal successors, (290), 252 states have internal predecessors, (290), 49 states have call successors, (49), 23 states have call predecessors, (49), 35 states have return successors, (302), 58 states have call predecessors, (302), 49 states have call successors, (302) [2022-12-14 13:42:11,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 641 transitions. [2022-12-14 13:42:11,445 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 641 transitions. Word has length 45 [2022-12-14 13:42:11,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:42:11,445 INFO L495 AbstractCegarLoop]: Abstraction has 334 states and 641 transitions. [2022-12-14 13:42:11,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 32 states have (on average 2.21875) internal successors, (71), 27 states have internal predecessors, (71), 12 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 11 states have call predecessors, (13), 7 states have call successors, (13) [2022-12-14 13:42:11,445 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 641 transitions. [2022-12-14 13:42:11,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-12-14 13:42:11,446 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:42:11,446 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:42:11,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:42:11,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (53)] Forceful destruction successful, exit code 0 [2022-12-14 13:42:11,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-12-14 13:42:12,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:42:12,049 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:42:12,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:42:12,050 INFO L85 PathProgramCache]: Analyzing trace with hash 80370447, now seen corresponding path program 2 times [2022-12-14 13:42:12,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:42:12,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [214013939] [2022-12-14 13:42:12,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:42:12,052 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 [2022-12-14 13:42:12,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:42:12,054 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:42:12,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:42:12,267 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:42:12,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:42:12,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 27 conjunts are in the unsatisfiable core [2022-12-14 13:42:12,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:42:12,282 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 0 case distinctions, treesize of input 6 treesize of output 7 [2022-12-14 13:42:12,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:42:13,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2022-12-14 13:42:13,569 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 19 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:13,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:42:14,818 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:14,818 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:42:14,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [214013939] [2022-12-14 13:42:14,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [214013939] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:42:14,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [740642704] [2022-12-14 13:42:14,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:42:14,818 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:42:14,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:42:14,819 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:42:14,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (56)] Waiting until timeout for monitored process [2022-12-14 13:42:15,171 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:42:15,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:42:15,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 29 conjunts are in the unsatisfiable core [2022-12-14 13:42:15,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:42:15,341 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 [2022-12-14 13:42:15,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:42:17,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2022-12-14 13:42:17,044 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 14 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:17,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:42:18,227 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:18,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [740642704] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:42:18,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002558387] [2022-12-14 13:42:18,228 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-14 13:42:18,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:42:18,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:42:18,229 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:42:18,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-12-14 13:42:18,433 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-14 13:42:18,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:42:18,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 25 conjunts are in the unsatisfiable core [2022-12-14 13:42:18,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:42:18,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:42:19,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2022-12-14 13:42:19,158 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 21 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 13:42:19,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:42:20,064 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 13:42:20,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002558387] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:42:20,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:42:20,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 16, 14, 16, 14] total 25 [2022-12-14 13:42:20,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737378152] [2022-12-14 13:42:20,065 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:42:20,065 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 13:42:20,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:42:20,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 13:42:20,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=572, Unknown=0, NotChecked=0, Total=650 [2022-12-14 13:42:20,066 INFO L87 Difference]: Start difference. First operand 334 states and 641 transitions. Second operand has 26 states, 22 states have (on average 2.772727272727273) internal successors, (61), 19 states have internal predecessors, (61), 8 states have call successors, (15), 8 states have call predecessors, (15), 8 states have return successors, (13), 9 states have call predecessors, (13), 5 states have call successors, (13) [2022-12-14 13:42:22,314 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 13:42:24,481 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-12-14 13:42:36,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:42:36,306 INFO L93 Difference]: Finished difference Result 423 states and 789 transitions. [2022-12-14 13:42:36,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 13:42:36,308 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 2.772727272727273) internal successors, (61), 19 states have internal predecessors, (61), 8 states have call successors, (15), 8 states have call predecessors, (15), 8 states have return successors, (13), 9 states have call predecessors, (13), 5 states have call successors, (13) Word has length 52 [2022-12-14 13:42:36,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:42:36,310 INFO L225 Difference]: With dead ends: 423 [2022-12-14 13:42:36,310 INFO L226 Difference]: Without dead ends: 423 [2022-12-14 13:42:36,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 284 SyntacticMatches, 8 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=251, Invalid=1555, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 13:42:36,311 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 264 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 2175 mSolverCounterSat, 106 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 2283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 2175 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:42:36,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 241 Invalid, 2283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 2175 Invalid, 2 Unknown, 0 Unchecked, 14.4s Time] [2022-12-14 13:42:36,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2022-12-14 13:42:36,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 363. [2022-12-14 13:42:36,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 257 states have (on average 1.2373540856031129) internal successors, (318), 275 states have internal predecessors, (318), 55 states have call successors, (55), 25 states have call predecessors, (55), 37 states have return successors, (352), 62 states have call predecessors, (352), 55 states have call successors, (352) [2022-12-14 13:42:36,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 725 transitions. [2022-12-14 13:42:36,328 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 725 transitions. Word has length 52 [2022-12-14 13:42:36,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:42:36,328 INFO L495 AbstractCegarLoop]: Abstraction has 363 states and 725 transitions. [2022-12-14 13:42:36,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 2.772727272727273) internal successors, (61), 19 states have internal predecessors, (61), 8 states have call successors, (15), 8 states have call predecessors, (15), 8 states have return successors, (13), 9 states have call predecessors, (13), 5 states have call successors, (13) [2022-12-14 13:42:36,328 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 725 transitions. [2022-12-14 13:42:36,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-12-14 13:42:36,329 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:42:36,329 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:42:36,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 [2022-12-14 13:42:36,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (56)] Forceful destruction successful, exit code 0 [2022-12-14 13:42:36,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-12-14 13:42:36,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:42:36,932 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:42:36,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:42:36,933 INFO L85 PathProgramCache]: Analyzing trace with hash 80370448, now seen corresponding path program 1 times [2022-12-14 13:42:36,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:42:36,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1595933957] [2022-12-14 13:42:36,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:42:36,934 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 [2022-12-14 13:42:36,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:42:36,937 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:42:36,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Waiting until timeout for monitored process [2022-12-14 13:42:37,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:42:37,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 13:42:37,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:42:37,358 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 5 [2022-12-14 13:42:37,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:42:37,733 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:42:38,855 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 21 treesize of output 9 [2022-12-14 13:42:38,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-12-14 13:42:39,259 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 19 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:39,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:42:45,326 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:45,326 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:42:45,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1595933957] [2022-12-14 13:42:45,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1595933957] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:42:45,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [476639709] [2022-12-14 13:42:45,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:42:45,326 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:42:45,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:42:45,327 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:42:45,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2022-12-14 13:42:45,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:42:45,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 37 conjunts are in the unsatisfiable core [2022-12-14 13:42:45,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:42:45,920 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 5 [2022-12-14 13:42:46,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:42:46,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:42:48,756 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-12-14 13:42:48,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:42:48,822 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 19 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:48,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:42:52,248 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:52,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [476639709] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:42:52,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296619342] [2022-12-14 13:42:52,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:42:52,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:42:52,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:42:52,249 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:42:52,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-12-14 13:42:52,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:42:52,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 37 conjunts are in the unsatisfiable core [2022-12-14 13:42:52,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:42:52,545 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 5 [2022-12-14 13:42:52,764 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:42:52,779 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 13:42:53,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-12-14 13:42:53,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2022-12-14 13:42:53,664 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 19 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:53,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:42:56,857 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 13:42:56,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296619342] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:42:56,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:42:56,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 16, 14, 16, 14] total 37 [2022-12-14 13:42:56,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086269820] [2022-12-14 13:42:56,858 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:42:56,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 13:42:56,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:42:56,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 13:42:56,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1284, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 13:42:56,861 INFO L87 Difference]: Start difference. First operand 363 states and 725 transitions. Second operand has 38 states, 32 states have (on average 2.5625) internal successors, (82), 27 states have internal predecessors, (82), 12 states have call successors, (17), 10 states have call predecessors, (17), 10 states have return successors, (15), 13 states have call predecessors, (15), 7 states have call successors, (15) [2022-12-14 13:42:59,217 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:43:21,243 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 13:43:27,054 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 [0] [2022-12-14 13:43:34,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:43:34,166 INFO L93 Difference]: Finished difference Result 505 states and 997 transitions. [2022-12-14 13:43:34,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 13:43:34,167 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 32 states have (on average 2.5625) internal successors, (82), 27 states have internal predecessors, (82), 12 states have call successors, (17), 10 states have call predecessors, (17), 10 states have return successors, (15), 13 states have call predecessors, (15), 7 states have call successors, (15) Word has length 52 [2022-12-14 13:43:34,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:43:34,169 INFO L225 Difference]: With dead ends: 505 [2022-12-14 13:43:34,169 INFO L226 Difference]: Without dead ends: 505 [2022-12-14 13:43:34,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 278 SyntacticMatches, 9 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1031 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=413, Invalid=4009, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 13:43:34,170 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 341 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 4163 mSolverCounterSat, 159 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 502 SdHoareTripleChecker+Invalid, 4325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 4163 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 29.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:43:34,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [343 Valid, 502 Invalid, 4325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 4163 Invalid, 3 Unknown, 0 Unchecked, 29.4s Time] [2022-12-14 13:43:34,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2022-12-14 13:43:34,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 424. [2022-12-14 13:43:34,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 303 states have (on average 1.2508250825082508) internal successors, (379), 320 states have internal predecessors, (379), 64 states have call successors, (64), 30 states have call predecessors, (64), 43 states have return successors, (412), 73 states have call predecessors, (412), 64 states have call successors, (412) [2022-12-14 13:43:34,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 855 transitions. [2022-12-14 13:43:34,191 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 855 transitions. Word has length 52 [2022-12-14 13:43:34,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:43:34,191 INFO L495 AbstractCegarLoop]: Abstraction has 424 states and 855 transitions. [2022-12-14 13:43:34,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 32 states have (on average 2.5625) internal successors, (82), 27 states have internal predecessors, (82), 12 states have call successors, (17), 10 states have call predecessors, (17), 10 states have return successors, (15), 13 states have call predecessors, (15), 7 states have call successors, (15) [2022-12-14 13:43:34,191 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 855 transitions. [2022-12-14 13:43:34,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-12-14 13:43:34,193 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:43:34,193 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:43:34,201 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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)] Ended with exit code 0 [2022-12-14 13:43:34,410 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2022-12-14 13:43:34,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (59)] Forceful destruction successful, exit code 0 [2022-12-14 13:43:34,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt [2022-12-14 13:43:34,796 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting checkErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:43:34,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:43:34,797 INFO L85 PathProgramCache]: Analyzing trace with hash 344803173, now seen corresponding path program 1 times [2022-12-14 13:43:34,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:43:34,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1480508760] [2022-12-14 13:43:34,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:43:34,799 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 [2022-12-14 13:43:34,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:43:34,801 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:43:34,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2022-12-14 13:43:35,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:43:35,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 13:43:35,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:43:35,231 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 [2022-12-14 13:43:35,822 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:35,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:43:36,436 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:36,436 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:43:36,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1480508760] [2022-12-14 13:43:36,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1480508760] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:43:36,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1717853231] [2022-12-14 13:43:36,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:43:36,437 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:43:36,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:43:36,438 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:43:36,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2022-12-14 13:43:36,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:43:36,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 13:43:36,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:43:36,854 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 6 treesize of output 7 [2022-12-14 13:43:37,244 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:37,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:43:37,912 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:37,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1717853231] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:43:37,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508680754] [2022-12-14 13:43:37,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:43:37,913 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:43:37,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:43:37,914 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:43:37,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-12-14 13:43:38,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:43:38,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 13:43:38,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:43:38,468 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-12-14 13:43:38,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:43:38,848 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-12-14 13:43:38,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508680754] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:43:38,848 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:43:38,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 8, 9, 8] total 10 [2022-12-14 13:43:38,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916369083] [2022-12-14 13:43:38,849 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:43:38,849 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-12-14 13:43:38,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:43:38,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-12-14 13:43:38,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-12-14 13:43:38,851 INFO L87 Difference]: Start difference. First operand 424 states and 855 transitions. Second operand has 11 states, 10 states have (on average 4.7) internal successors, (47), 9 states have internal predecessors, (47), 4 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 13:43:41,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:43:41,337 INFO L93 Difference]: Finished difference Result 442 states and 878 transitions. [2022-12-14 13:43:41,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 13:43:41,338 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.7) internal successors, (47), 9 states have internal predecessors, (47), 4 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 48 [2022-12-14 13:43:41,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:43:41,340 INFO L225 Difference]: With dead ends: 442 [2022-12-14 13:43:41,340 INFO L226 Difference]: Without dead ends: 442 [2022-12-14 13:43:41,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 267 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2022-12-14 13:43:41,341 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 230 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:43:41,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [230 Valid, 51 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-12-14 13:43:41,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2022-12-14 13:43:41,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 433. [2022-12-14 13:43:41,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 312 states have (on average 1.2532051282051282) internal successors, (391), 327 states have internal predecessors, (391), 66 states have call successors, (66), 30 states have call predecessors, (66), 43 states have return successors, (413), 75 states have call predecessors, (413), 66 states have call successors, (413) [2022-12-14 13:43:41,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 870 transitions. [2022-12-14 13:43:41,359 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 870 transitions. Word has length 48 [2022-12-14 13:43:41,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:43:41,363 INFO L495 AbstractCegarLoop]: Abstraction has 433 states and 870 transitions. [2022-12-14 13:43:41,363 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.7) internal successors, (47), 9 states have internal predecessors, (47), 4 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 13:43:41,363 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 870 transitions. [2022-12-14 13:43:41,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-12-14 13:43:41,364 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:43:41,364 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:43:41,371 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2022-12-14 13:43:41,571 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (62)] Ended with exit code 0 [2022-12-14 13:43:41,794 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (61)] Ended with exit code 0 [2022-12-14 13:43:41,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:43:41,966 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting checkErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:43:41,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:43:41,967 INFO L85 PathProgramCache]: Analyzing trace with hash 344803174, now seen corresponding path program 1 times [2022-12-14 13:43:41,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:43:41,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1484987668] [2022-12-14 13:43:41,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:43:41,969 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 [2022-12-14 13:43:41,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:43:41,970 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:43:41,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2022-12-14 13:43:42,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:43:42,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 13:43:42,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:43:42,224 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 5 [2022-12-14 13:43:43,114 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:43,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:43:45,114 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:45,114 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:43:45,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1484987668] [2022-12-14 13:43:45,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1484987668] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:43:45,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [63380704] [2022-12-14 13:43:45,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:43:45,115 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:43:45,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:43:45,116 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:43:45,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2022-12-14 13:43:45,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:43:45,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 13:43:45,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:43:45,559 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 0 case distinctions, treesize of input 6 treesize of output 5 [2022-12-14 13:43:46,117 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:46,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:43:48,448 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:48,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [63380704] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:43:48,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571898172] [2022-12-14 13:43:48,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:43:48,449 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:43:48,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:43:48,450 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:43:48,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-12-14 13:43:48,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:43:48,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 13:43:48,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:43:48,651 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 5 [2022-12-14 13:43:49,150 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:49,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:43:51,224 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-12-14 13:43:51,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1571898172] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:43:51,224 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-12-14 13:43:51,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 8, 9, 8] total 16 [2022-12-14 13:43:51,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494023252] [2022-12-14 13:43:51,225 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-12-14 13:43:51,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 13:43:51,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-12-14 13:43:51,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 13:43:51,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2022-12-14 13:43:51,226 INFO L87 Difference]: Start difference. First operand 433 states and 870 transitions. Second operand has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 6 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) [2022-12-14 13:43:56,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:43:56,459 INFO L93 Difference]: Finished difference Result 459 states and 904 transitions. [2022-12-14 13:43:56,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 13:43:56,461 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 6 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) Word has length 48 [2022-12-14 13:43:56,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:43:56,463 INFO L225 Difference]: With dead ends: 459 [2022-12-14 13:43:56,463 INFO L226 Difference]: Without dead ends: 459 [2022-12-14 13:43:56,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 258 SyntacticMatches, 10 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2022-12-14 13:43:56,464 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 185 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 797 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 847 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:43:56,464 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [187 Valid, 106 Invalid, 847 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 797 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-12-14 13:43:56,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2022-12-14 13:43:56,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 450. [2022-12-14 13:43:56,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 325 states have (on average 1.2523076923076923) internal successors, (407), 340 states have internal predecessors, (407), 69 states have call successors, (69), 31 states have call predecessors, (69), 44 states have return successors, (416), 78 states have call predecessors, (416), 69 states have call successors, (416) [2022-12-14 13:43:56,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 892 transitions. [2022-12-14 13:43:56,483 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 892 transitions. Word has length 48 [2022-12-14 13:43:56,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:43:56,483 INFO L495 AbstractCegarLoop]: Abstraction has 450 states and 892 transitions. [2022-12-14 13:43:56,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 6 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) [2022-12-14 13:43:56,483 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 892 transitions. [2022-12-14 13:43:56,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-12-14 13:43:56,484 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:43:56,484 INFO L195 NwaCegarLoop]: trace histogram [17, 10, 9, 9, 9, 9, 9, 9, 9, 9, 8, 7, 7, 1, 1, 1, 1] [2022-12-14 13:43:56,491 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (65)] Ended with exit code 0 [2022-12-14 13:43:56,693 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2022-12-14 13:43:56,917 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (64)] Ended with exit code 0 [2022-12-14 13:43:57,086 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-12-14 13:43:57,087 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-12-14 13:43:57,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:43:57,088 INFO L85 PathProgramCache]: Analyzing trace with hash 825648746, now seen corresponding path program 5 times [2022-12-14 13:43:57,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-12-14 13:43:57,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1417571666] [2022-12-14 13:43:57,090 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-12-14 13:43:57,090 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 [2022-12-14 13:43:57,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat [2022-12-14 13:43:57,091 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -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) [2022-12-14 13:43:57,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2022-12-14 13:43:58,815 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2022-12-14 13:43:58,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:43:58,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 13:43:58,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:43:58,862 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 [2022-12-14 13:43:58,875 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 5 [2022-12-14 13:43:59,175 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_4918 (_ BitVec 32))) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_4918))) (exists ((v_ArrVal_4919 (_ BitVec 1))) (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_4919))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:43:59,307 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_ArrVal_4918 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_4919 (_ BitVec 1))) (and (= |c_#valid| (store |c_old(#valid)| nondet_tree_~n~0.base v_ArrVal_4919)) (= |c_#length| (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_4918)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:43:59,409 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_4920 (_ BitVec 32))) (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_4920) |c_#length|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:43:59,517 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (v_ArrVal_4920 (_ BitVec 32))) (and (= (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_4920) |c_#length|) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-12-14 13:43:59,755 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 [2022-12-14 13:44:00,241 WARN L859 $PredicateComparison]: unable to prove that (exists ((|nondet_tree_#res.base| (_ BitVec 32))) (and (= (_ bv0 1) (select |c_old(#valid)| |nondet_tree_#res.base|)) (= (store |c_old(#length)| |nondet_tree_#res.base| (_ bv12 32)) |c_#length|))) is different from true [2022-12-14 13:44:00,300 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-12-14 13:44:00,300 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 [2022-12-14 13:44:00,325 WARN L859 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32)) (|nondet_tree_#res.base| (_ BitVec 32))) (and (= (store (store |c_old(#length)| nondet_tree_~n~0.base (_ bv12 32)) |nondet_tree_#res.base| (_ bv12 32)) |c_#length|) (not (= nondet_tree_~n~0.base |nondet_tree_#res.base|)))) is different from true [2022-12-14 13:44:00,546 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_593 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (|nondet_tree_#res.base| (_ BitVec 32)) (v_ArrVal_4921 (_ BitVec 32))) (and (not (= v_nondet_tree_~n~0.base_593 |nondet_tree_#res.base|)) (bvule (_ bv12 32) (select |c_#length| nondet_tree_~n~0.base)) (= |c_#length| (store (store (store |c_old(#length)| nondet_tree_~n~0.base v_ArrVal_4921) v_nondet_tree_~n~0.base_593 (_ bv12 32)) |nondet_tree_#res.base| (_ bv12 32))))) is different from true [2022-12-14 13:44:00,662 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_593 (_ BitVec 32)) (v_nondet_tree_~n~0.base_594 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (|nondet_tree_#res.base| (_ BitVec 32)) (v_ArrVal_4921 (_ BitVec 32)) (v_ArrVal_4920 (_ BitVec 32))) (and (not (= v_nondet_tree_~n~0.base_593 |nondet_tree_#res.base|)) (bvule (_ bv12 32) (select |c_#length| nondet_tree_~n~0.base)) (= (select |c_old(#valid)| v_nondet_tree_~n~0.base_594) (_ bv0 1)) (= |c_#length| (store (store (store (store |c_old(#length)| v_nondet_tree_~n~0.base_594 v_ArrVal_4920) nondet_tree_~n~0.base v_ArrVal_4921) v_nondet_tree_~n~0.base_593 (_ bv12 32)) |nondet_tree_#res.base| (_ bv12 32))))) is different from true [2022-12-14 13:44:00,870 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_nondet_tree_~n~0.base_595 (_ BitVec 32)) (v_ArrVal_4918 (_ BitVec 32)) (v_nondet_tree_~n~0.base_593 (_ BitVec 32)) (v_nondet_tree_~n~0.base_594 (_ BitVec 32)) (nondet_tree_~n~0.base (_ BitVec 32)) (|nondet_tree_#res.base| (_ BitVec 32)) (v_ArrVal_4921 (_ BitVec 32)) (v_ArrVal_4920 (_ BitVec 32)) (v_ArrVal_4919 (_ BitVec 1))) (and (not (= v_nondet_tree_~n~0.base_593 |nondet_tree_#res.base|)) (bvule (_ bv12 32) (select |c_#length| nondet_tree_~n~0.base)) (= (select |c_old(#valid)| v_nondet_tree_~n~0.base_595) (_ bv0 1)) (= (store (store (store (store (store |c_old(#length)| v_nondet_tree_~n~0.base_595 v_ArrVal_4918) v_nondet_tree_~n~0.base_594 v_ArrVal_4920) nondet_tree_~n~0.base v_ArrVal_4921) v_nondet_tree_~n~0.base_593 (_ bv12 32)) |nondet_tree_#res.base| (_ bv12 32)) |c_#length|) (= (_ bv0 1) (select (store |c_old(#valid)| v_nondet_tree_~n~0.base_595 v_ArrVal_4919) v_nondet_tree_~n~0.base_594)))) is different from true [2022-12-14 13:44:01,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:44:01,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 13:44:01,708 INFO L321 Elim1Store]: treesize reduction 165, result has 25.0 percent of original size [2022-12-14 13:44:01,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 24 treesize of output 68 [2022-12-14 13:44:01,859 INFO L321 Elim1Store]: treesize reduction 17, result has 45.2 percent of original size [2022-12-14 13:44:01,859 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 38 [2022-12-14 13:44:02,136 INFO L134 CoverageAnalysis]: Checked inductivity of 708 backedges. 346 proven. 86 refuted. 1 times theorem prover too weak. 109 trivial. 166 not checked. [2022-12-14 13:44:02,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:44:04,158 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 10 treesize of output 8 [2022-12-14 13:44:10,726 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-12-14 13:44:10,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1417571666] [2022-12-14 13:44:10,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1417571666] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:44:10,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [851118333] [2022-12-14 13:44:10,727 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-12-14 13:44:10,727 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-12-14 13:44:10,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 [2022-12-14 13:44:10,728 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-12-14 13:44:10,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2022-12-14 13:44:11,121 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:44:11,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1971008926] [2022-12-14 13:44:11,121 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-12-14 13:44:11,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:44:11,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:44:11,122 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:44:11,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-12-14 13:44:11,126 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_345d3ddc-6dd2-405c-b999-08f3af08f81f/bin/utaipan-gh47qXpMRh/cvc4 --incremental --print-success --lang smt (68)] Ended with exit code 1