./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/stroeder1-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/stroeder1-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7ecc590057ed2a75208183cfd6234616268fa2b1af2dc90ae740756ef7d3d489 --- 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-5e519f3 [2022-11-03 03:44:23,357 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:44:23,359 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:44:23,391 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:44:23,391 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:44:23,392 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:44:23,394 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:44:23,396 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:44:23,398 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:44:23,399 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:44:23,401 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:44:23,402 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:44:23,403 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:44:23,404 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:44:23,405 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:44:23,406 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:44:23,407 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:44:23,408 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:44:23,410 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:44:23,413 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:44:23,414 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:44:23,416 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:44:23,417 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:44:23,418 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:44:23,422 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:44:23,422 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:44:23,423 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:44:23,424 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:44:23,424 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:44:23,426 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:44:23,426 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:44:23,427 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:44:23,428 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:44:23,429 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:44:23,430 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:44:23,431 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:44:23,432 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:44:23,432 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:44:23,433 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:44:23,443 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:44:23,445 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:44:23,446 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-03 03:44:23,495 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:44:23,497 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:44:23,498 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:44:23,498 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:44:23,499 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:44:23,500 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:44:23,500 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:44:23,500 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:44:23,500 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:44:23,501 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 03:44:23,502 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:44:23,502 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:44:23,502 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 03:44:23,502 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 03:44:23,503 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:44:23,503 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 03:44:23,503 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 03:44:23,503 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 03:44:23,504 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-03 03:44:23,504 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-03 03:44:23,504 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:44:23,505 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 03:44:23,505 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-03 03:44:23,505 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:44:23,505 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 03:44:23,506 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:44:23,506 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-03 03:44:23,506 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-03 03:44:23,506 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-03 03:44:23,507 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:44:23,507 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-03 03:44:23,507 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 03:44:23,507 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:44:23,508 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:44:23,508 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:44:23,508 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:44:23,508 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:44:23,509 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 03:44:23,509 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:44:23,510 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 03:44:23,511 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 03:44:23,511 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:44:23,511 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_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7ecc590057ed2a75208183cfd6234616268fa2b1af2dc90ae740756ef7d3d489 [2022-11-03 03:44:23,767 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:44:23,797 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:44:23,800 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:44:23,801 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:44:23,802 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:44:23,804 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/array-memsafety/stroeder1-alloca-1.i [2022-11-03 03:44:23,896 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data/dada60d36/51832102337a4c8bac3126b99c79cd75/FLAGc41259ec3 [2022-11-03 03:44:24,399 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:44:24,400 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/sv-benchmarks/c/array-memsafety/stroeder1-alloca-1.i [2022-11-03 03:44:24,416 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data/dada60d36/51832102337a4c8bac3126b99c79cd75/FLAGc41259ec3 [2022-11-03 03:44:24,717 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data/dada60d36/51832102337a4c8bac3126b99c79cd75 [2022-11-03 03:44:24,720 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:44:24,721 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:44:24,722 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:44:24,723 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:44:24,727 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:44:24,728 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:44:24" (1/1) ... [2022-11-03 03:44:24,730 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@204b285f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:24, skipping insertion in model container [2022-11-03 03:44:24,730 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:44:24" (1/1) ... [2022-11-03 03:44:24,737 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:44:24,788 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:44:25,091 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:44:25,101 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2022-11-03 03:44:25,102 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@274c60dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:25, skipping insertion in model container [2022-11-03 03:44:25,102 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:44:25,102 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-11-03 03:44:25,104 INFO L158 Benchmark]: Toolchain (without parser) took 382.10ms. Allocated memory is still 113.2MB. Free memory was 89.7MB in the beginning and 86.7MB in the end (delta: 3.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2022-11-03 03:44:25,105 INFO L158 Benchmark]: CDTParser took 0.30ms. Allocated memory is still 113.2MB. Free memory is still 82.5MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 03:44:25,106 INFO L158 Benchmark]: CACSL2BoogieTranslator took 379.75ms. Allocated memory is still 113.2MB. Free memory was 89.7MB in the beginning and 86.7MB in the end (delta: 3.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2022-11-03 03:44:25,108 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30ms. Allocated memory is still 113.2MB. Free memory is still 82.5MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 379.75ms. Allocated memory is still 113.2MB. Free memory was 89.7MB in the beginning and 86.7MB in the end (delta: 3.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 529]: 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-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/stroeder1-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7ecc590057ed2a75208183cfd6234616268fa2b1af2dc90ae740756ef7d3d489 --- 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-5e519f3 [2022-11-03 03:44:27,396 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:44:27,399 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:44:27,459 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:44:27,460 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:44:27,463 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:44:27,466 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:44:27,470 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:44:27,476 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:44:27,483 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:44:27,485 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:44:27,487 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:44:27,488 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:44:27,490 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:44:27,492 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:44:27,493 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:44:27,495 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:44:27,496 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:44:27,498 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:44:27,506 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:44:27,508 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:44:27,509 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:44:27,512 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:44:27,514 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:44:27,523 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:44:27,523 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:44:27,524 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:44:27,526 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:44:27,526 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:44:27,527 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:44:27,528 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:44:27,528 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:44:27,530 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:44:27,531 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:44:27,532 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:44:27,533 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:44:27,534 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:44:27,534 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:44:27,534 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:44:27,536 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:44:27,537 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:44:27,542 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2022-11-03 03:44:27,584 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:44:27,585 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:44:27,586 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:44:27,586 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:44:27,587 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:44:27,587 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:44:27,588 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:44:27,588 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:44:27,588 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:44:27,588 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:44:27,589 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:44:27,589 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:44:27,591 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-03 03:44:27,591 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-03 03:44:27,591 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:44:27,592 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 03:44:27,592 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-03 03:44:27,592 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:44:27,592 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 03:44:27,592 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:44:27,592 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-03 03:44:27,593 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-03 03:44:27,593 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-03 03:44:27,593 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:44:27,593 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-03 03:44:27,593 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-11-03 03:44:27,594 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-11-03 03:44:27,594 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 03:44:27,594 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:44:27,594 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:44:27,595 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-03 03:44:27,595 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:44:27,595 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:44:27,595 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:44:27,596 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:44:27,596 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2022-11-03 03:44:27,596 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:27,596 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:44:27,596 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-11-03 03:44:27,597 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_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7ecc590057ed2a75208183cfd6234616268fa2b1af2dc90ae740756ef7d3d489 [2022-11-03 03:44:27,995 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:44:28,016 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:44:28,018 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:44:28,020 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:44:28,020 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:44:28,022 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/array-memsafety/stroeder1-alloca-1.i [2022-11-03 03:44:28,098 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data/6b5af0cca/7a82130b81c84e93a3fa48ffc1cc0980/FLAG76ab13f83 [2022-11-03 03:44:28,600 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:44:28,600 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/sv-benchmarks/c/array-memsafety/stroeder1-alloca-1.i [2022-11-03 03:44:28,613 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data/6b5af0cca/7a82130b81c84e93a3fa48ffc1cc0980/FLAG76ab13f83 [2022-11-03 03:44:28,928 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/data/6b5af0cca/7a82130b81c84e93a3fa48ffc1cc0980 [2022-11-03 03:44:28,930 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:44:28,932 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:44:28,933 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:44:28,934 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:44:28,938 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:44:28,939 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:44:28" (1/1) ... [2022-11-03 03:44:28,940 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@aabcbf5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:28, skipping insertion in model container [2022-11-03 03:44:28,940 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:44:28" (1/1) ... [2022-11-03 03:44:28,948 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:44:28,984 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:44:29,312 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:44:29,327 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-11-03 03:44:29,348 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:44:29,374 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:44:29,379 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 03:44:29,425 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:44:29,475 INFO L208 MainTranslator]: Completed translation [2022-11-03 03:44:29,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29 WrapperNode [2022-11-03 03:44:29,476 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:44:29,477 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 03:44:29,478 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 03:44:29,478 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 03:44:29,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,501 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,521 INFO L138 Inliner]: procedures = 119, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 51 [2022-11-03 03:44:29,521 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 03:44:29,522 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 03:44:29,522 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 03:44:29,522 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 03:44:29,531 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,531 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,535 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,535 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,542 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,546 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,547 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,548 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,551 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 03:44:29,552 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 03:44:29,552 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 03:44:29,552 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 03:44:29,561 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (1/1) ... [2022-11-03 03:44:29,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:44:29,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:29,603 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 03:44:29,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 03:44:29,646 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2022-11-03 03:44:29,648 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-03 03:44:29,648 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-03 03:44:29,648 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-11-03 03:44:29,649 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 03:44:29,649 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 03:44:29,775 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 03:44:29,778 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 03:44:30,021 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 03:44:30,026 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 03:44:30,027 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-03 03:44:30,029 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:44:30 BoogieIcfgContainer [2022-11-03 03:44:30,029 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 03:44:30,031 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 03:44:30,031 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 03:44:30,034 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 03:44:30,034 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 03:44:28" (1/3) ... [2022-11-03 03:44:30,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4483e100 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:44:30, skipping insertion in model container [2022-11-03 03:44:30,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:29" (2/3) ... [2022-11-03 03:44:30,036 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4483e100 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:44:30, skipping insertion in model container [2022-11-03 03:44:30,036 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:44:30" (3/3) ... [2022-11-03 03:44:30,037 INFO L112 eAbstractionObserver]: Analyzing ICFG stroeder1-alloca-1.i [2022-11-03 03:44:30,071 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 03:44:30,072 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2022-11-03 03:44:30,116 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 03:44:30,123 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;@364f3f80, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 03:44:30,123 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2022-11-03 03:44:30,132 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 17 states have (on average 1.588235294117647) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:30,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 03:44:30,139 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:30,140 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 03:44:30,141 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:30,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:30,150 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2022-11-03 03:44:30,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:30,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1036766815] [2022-11-03 03:44:30,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:30,166 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:30,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:30,171 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:30,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-11-03 03:44:30,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:30,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 03:44:30,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:30,373 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:44:30,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:30,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:44:30,417 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:30,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1036766815] [2022-11-03 03:44:30,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1036766815] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:30,420 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:30,420 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:44:30,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286912259] [2022-11-03 03:44:30,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:30,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:44:30,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:30,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:44:30,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:44:30,492 INFO L87 Difference]: Start difference. First operand has 23 states, 17 states have (on average 1.588235294117647) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:30,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:30,545 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2022-11-03 03:44:30,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:44:30,548 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-03 03:44:30,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:30,563 INFO L225 Difference]: With dead ends: 22 [2022-11-03 03:44:30,564 INFO L226 Difference]: Without dead ends: 20 [2022-11-03 03:44:30,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:44:30,570 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 14 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:30,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 21 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:44:30,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-03 03:44:30,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-03 03:44:30,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.375) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:30,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2022-11-03 03:44:30,608 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 6 [2022-11-03 03:44:30,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:30,608 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2022-11-03 03:44:30,609 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:30,609 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2022-11-03 03:44:30,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 03:44:30,610 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:30,610 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 03:44:30,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:30,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:30,827 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:30,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:30,828 INFO L85 PathProgramCache]: Analyzing trace with hash 889508874, now seen corresponding path program 1 times [2022-11-03 03:44:30,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:30,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [604679637] [2022-11-03 03:44:30,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:30,829 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:30,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:30,831 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:30,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-11-03 03:44:30,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:30,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 03:44:30,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:30,957 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:44:31,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:31,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:44:31,009 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:31,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [604679637] [2022-11-03 03:44:31,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [604679637] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:31,011 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:31,012 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:44:31,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072735392] [2022-11-03 03:44:31,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:31,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:44:31,014 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:31,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:44:31,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:44:31,018 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:31,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:31,157 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2022-11-03 03:44:31,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:44:31,161 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-03 03:44:31,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:31,162 INFO L225 Difference]: With dead ends: 41 [2022-11-03 03:44:31,162 INFO L226 Difference]: Without dead ends: 41 [2022-11-03 03:44:31,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:44:31,164 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 23 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:31,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 65 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:31,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-03 03:44:31,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 23. [2022-11-03 03:44:31,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 22 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:31,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-11-03 03:44:31,174 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 6 [2022-11-03 03:44:31,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:31,175 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-11-03 03:44:31,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:31,176 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-11-03 03:44:31,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 03:44:31,177 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:31,177 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 03:44:31,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:31,388 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:31,388 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:31,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:31,389 INFO L85 PathProgramCache]: Analyzing trace with hash 889568456, now seen corresponding path program 1 times [2022-11-03 03:44:31,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:31,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [461616337] [2022-11-03 03:44:31,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:31,389 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:31,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:31,393 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:31,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-11-03 03:44:31,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:31,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 03:44:31,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:31,516 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:31,588 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:31,589 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:44:31,589 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:31,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [461616337] [2022-11-03 03:44:31,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [461616337] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:31,590 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:31,590 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:44:31,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543100111] [2022-11-03 03:44:31,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:31,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:44:31,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:31,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:44:31,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:44:31,593 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:31,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:31,632 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2022-11-03 03:44:31,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:44:31,633 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-03 03:44:31,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:31,634 INFO L225 Difference]: With dead ends: 25 [2022-11-03 03:44:31,634 INFO L226 Difference]: Without dead ends: 25 [2022-11-03 03:44:31,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:44:31,636 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 1 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:31,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 44 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 9 Unchecked, 0.0s Time] [2022-11-03 03:44:31,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-03 03:44:31,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2022-11-03 03:44:31,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 20 states have (on average 1.35) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:31,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2022-11-03 03:44:31,641 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 6 [2022-11-03 03:44:31,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:31,641 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2022-11-03 03:44:31,642 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:31,642 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2022-11-03 03:44:31,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-03 03:44:31,643 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:31,643 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:31,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:31,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:31,855 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:31,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:31,856 INFO L85 PathProgramCache]: Analyzing trace with hash 176742579, now seen corresponding path program 1 times [2022-11-03 03:44:31,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:31,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [5489185] [2022-11-03 03:44:31,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:31,857 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:31,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:31,858 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:31,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-11-03 03:44:31,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:31,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 03:44:31,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:31,928 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:44:31,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:31,962 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:44:31,963 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:31,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [5489185] [2022-11-03 03:44:31,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [5489185] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:31,964 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:31,964 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 03:44:31,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325410517] [2022-11-03 03:44:31,964 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:31,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 03:44:31,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:31,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 03:44:31,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:44:31,966 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:32,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:32,070 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2022-11-03 03:44:32,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:44:32,071 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-03 03:44:32,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:32,072 INFO L225 Difference]: With dead ends: 26 [2022-11-03 03:44:32,072 INFO L226 Difference]: Without dead ends: 26 [2022-11-03 03:44:32,072 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:44:32,073 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 26 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:32,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 32 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:32,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-03 03:44:32,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2022-11-03 03:44:32,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 20 states have (on average 1.3) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:32,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2022-11-03 03:44:32,077 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 8 [2022-11-03 03:44:32,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:32,077 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2022-11-03 03:44:32,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:32,077 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2022-11-03 03:44:32,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-03 03:44:32,078 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:32,078 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:32,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:32,287 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:32,287 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:32,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:32,288 INFO L85 PathProgramCache]: Analyzing trace with hash 176742580, now seen corresponding path program 1 times [2022-11-03 03:44:32,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:32,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1053081479] [2022-11-03 03:44:32,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:32,288 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:32,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:32,290 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:32,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-11-03 03:44:32,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:32,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 03:44:32,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:32,382 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:32,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:32,563 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:44:32,563 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:32,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1053081479] [2022-11-03 03:44:32,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1053081479] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:32,564 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:32,564 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 03:44:32,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008922525] [2022-11-03 03:44:32,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:32,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 03:44:32,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:32,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 03:44:32,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:44:32,566 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:32,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:32,603 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2022-11-03 03:44:32,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:44:32,604 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-03 03:44:32,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:32,604 INFO L225 Difference]: With dead ends: 26 [2022-11-03 03:44:32,604 INFO L226 Difference]: Without dead ends: 26 [2022-11-03 03:44:32,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:44:32,605 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:32,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 56 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 19 Unchecked, 0.0s Time] [2022-11-03 03:44:32,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-03 03:44:32,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-03 03:44:32,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:32,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2022-11-03 03:44:32,609 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 8 [2022-11-03 03:44:32,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:32,609 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2022-11-03 03:44:32,610 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:32,610 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2022-11-03 03:44:32,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 03:44:32,610 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:32,610 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:32,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:32,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:32,822 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:32,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:32,823 INFO L85 PathProgramCache]: Analyzing trace with hash -1091210163, now seen corresponding path program 1 times [2022-11-03 03:44:32,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:32,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1458655817] [2022-11-03 03:44:32,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:32,824 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:32,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:32,825 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:32,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-11-03 03:44:32,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:32,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 03:44:32,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:32,973 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:32,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:33,039 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:33,039 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:33,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1458655817] [2022-11-03 03:44:33,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1458655817] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:33,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [652423120] [2022-11-03 03:44:33,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:33,040 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:33,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:44:33,059 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:44:33,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2022-11-03 03:44:33,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:33,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 03:44:33,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:33,287 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:33,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:33,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:33,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [652423120] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:33,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17442775] [2022-11-03 03:44:33,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:33,329 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:33,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:33,335 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:33,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 03:44:33,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:33,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 03:44:33,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:33,438 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:33,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:33,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:33,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17442775] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:33,462 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:44:33,462 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2022-11-03 03:44:33,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129047107] [2022-11-03 03:44:33,462 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:33,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 03:44:33,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:33,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 03:44:33,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-11-03 03:44:33,464 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:33,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:33,538 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-11-03 03:44:33,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 03:44:33,539 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-03 03:44:33,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:33,540 INFO L225 Difference]: With dead ends: 40 [2022-11-03 03:44:33,540 INFO L226 Difference]: Without dead ends: 40 [2022-11-03 03:44:33,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-11-03 03:44:33,541 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 62 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:33,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 61 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:33,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-03 03:44:33,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2022-11-03 03:44:33,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:33,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-11-03 03:44:33,545 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 10 [2022-11-03 03:44:33,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:33,546 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-11-03 03:44:33,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:33,546 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-11-03 03:44:33,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 03:44:33,547 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:33,547 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:33,564 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2022-11-03 03:44:33,785 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-03 03:44:33,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:34,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:34,165 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:34,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:34,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2022-11-03 03:44:34,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:34,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1857495155] [2022-11-03 03:44:34,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:34,166 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:34,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:34,167 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:34,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2022-11-03 03:44:34,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:34,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 03:44:34,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:34,285 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:34,565 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:34,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:35,172 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:35,173 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:35,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1857495155] [2022-11-03 03:44:35,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1857495155] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:35,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1976282413] [2022-11-03 03:44:35,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:35,174 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:35,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:44:35,177 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:44:35,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2022-11-03 03:44:35,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:35,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 03:44:35,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:35,320 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:35,473 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:35,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:35,702 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:35,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1976282413] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:35,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662751179] [2022-11-03 03:44:35,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:35,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:35,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:35,705 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:35,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 03:44:35,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:35,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 03:44:35,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:35,806 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:35,896 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:35,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:36,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:36,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662751179] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:36,137 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:44:36,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 12 [2022-11-03 03:44:36,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920956498] [2022-11-03 03:44:36,138 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:36,138 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 03:44:36,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:36,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 03:44:36,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2022-11-03 03:44:36,139 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:36,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:36,543 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2022-11-03 03:44:36,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 03:44:36,544 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-03 03:44:36,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:36,545 INFO L225 Difference]: With dead ends: 45 [2022-11-03 03:44:36,545 INFO L226 Difference]: Without dead ends: 45 [2022-11-03 03:44:36,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2022-11-03 03:44:36,546 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 68 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 13 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:36,547 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 71 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 58 Invalid, 0 Unknown, 13 Unchecked, 0.3s Time] [2022-11-03 03:44:36,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-03 03:44:36,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 35. [2022-11-03 03:44:36,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 32 states have (on average 1.21875) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:36,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2022-11-03 03:44:36,551 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 10 [2022-11-03 03:44:36,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:36,552 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2022-11-03 03:44:36,552 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:36,552 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2022-11-03 03:44:36,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-03 03:44:36,553 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:36,553 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:36,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:36,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:36,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:37,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:37,164 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:37,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:37,164 INFO L85 PathProgramCache]: Analyzing trace with hash -680998151, now seen corresponding path program 1 times [2022-11-03 03:44:37,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:37,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [11992837] [2022-11-03 03:44:37,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:37,165 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:37,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:37,166 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:37,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2022-11-03 03:44:37,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:37,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 03:44:37,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:37,256 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:44:37,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:37,370 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:44:37,370 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:37,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [11992837] [2022-11-03 03:44:37,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [11992837] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:37,371 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:37,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 03:44:37,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979656848] [2022-11-03 03:44:37,371 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:37,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 03:44:37,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:37,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 03:44:37,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:44:37,373 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:37,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:37,595 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2022-11-03 03:44:37,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:44:37,596 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-03 03:44:37,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:37,597 INFO L225 Difference]: With dead ends: 58 [2022-11-03 03:44:37,597 INFO L226 Difference]: Without dead ends: 58 [2022-11-03 03:44:37,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2022-11-03 03:44:37,598 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 63 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:37,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 72 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:37,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-03 03:44:37,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 38. [2022-11-03 03:44:37,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 37 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:37,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2022-11-03 03:44:37,605 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 12 [2022-11-03 03:44:37,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:37,606 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2022-11-03 03:44:37,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:37,606 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2022-11-03 03:44:37,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-03 03:44:37,609 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:37,609 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:37,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:37,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:37,810 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:37,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:37,810 INFO L85 PathProgramCache]: Analyzing trace with hash -1074025161, now seen corresponding path program 1 times [2022-11-03 03:44:37,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:37,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1081621032] [2022-11-03 03:44:37,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:37,811 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:37,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:37,812 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:37,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2022-11-03 03:44:37,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:37,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 03:44:37,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:37,889 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:39,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:39,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:40,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:40,035 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:40,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1081621032] [2022-11-03 03:44:40,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1081621032] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:40,035 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:44:40,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2022-11-03 03:44:40,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732160628] [2022-11-03 03:44:40,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:40,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 03:44:40,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:40,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 03:44:40,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-11-03 03:44:40,036 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:40,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:40,779 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2022-11-03 03:44:40,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:44:40,780 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-03 03:44:40,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:40,781 INFO L225 Difference]: With dead ends: 46 [2022-11-03 03:44:40,781 INFO L226 Difference]: Without dead ends: 46 [2022-11-03 03:44:40,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2022-11-03 03:44:40,782 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 38 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:40,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 47 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:44:40,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-03 03:44:40,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 37. [2022-11-03 03:44:40,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 36 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:40,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2022-11-03 03:44:40,785 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 12 [2022-11-03 03:44:40,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:40,786 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2022-11-03 03:44:40,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:40,786 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2022-11-03 03:44:40,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 03:44:40,786 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:40,787 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:40,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:40,987 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:40,987 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:40,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:40,988 INFO L85 PathProgramCache]: Analyzing trace with hash -1604245468, now seen corresponding path program 1 times [2022-11-03 03:44:40,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:40,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2016493354] [2022-11-03 03:44:40,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:40,988 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:40,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:40,990 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:41,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-11-03 03:44:41,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:41,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 03:44:41,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:41,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:41,084 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:44:41,085 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:41,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2016493354] [2022-11-03 03:44:41,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2016493354] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:41,085 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:41,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 03:44:41,086 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553504849] [2022-11-03 03:44:41,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:41,086 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:44:41,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:41,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:44:41,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:44:41,087 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:41,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:41,135 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2022-11-03 03:44:41,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:44:41,136 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-03 03:44:41,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:41,136 INFO L225 Difference]: With dead ends: 51 [2022-11-03 03:44:41,136 INFO L226 Difference]: Without dead ends: 51 [2022-11-03 03:44:41,137 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:44:41,137 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 16 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:41,138 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 52 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:44:41,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-03 03:44:41,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 39. [2022-11-03 03:44:41,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 38 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:41,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2022-11-03 03:44:41,140 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 14 [2022-11-03 03:44:41,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:41,141 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2022-11-03 03:44:41,141 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:41,141 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2022-11-03 03:44:41,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 03:44:41,141 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:41,141 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:41,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:41,342 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:41,342 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:41,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:41,342 INFO L85 PathProgramCache]: Analyzing trace with hash -1346080030, now seen corresponding path program 1 times [2022-11-03 03:44:41,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:41,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1789424211] [2022-11-03 03:44:41,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:41,343 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:41,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:41,344 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:41,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-11-03 03:44:41,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:41,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 03:44:41,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:41,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:41,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:41,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:41,628 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:41,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1789424211] [2022-11-03 03:44:41,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1789424211] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:41,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [40938561] [2022-11-03 03:44:41,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:41,629 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:41,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:44:41,631 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:44:41,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2022-11-03 03:44:41,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:41,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 03:44:41,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:41,805 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:41,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:41,855 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:41,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [40938561] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:41,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658443620] [2022-11-03 03:44:41,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:41,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:41,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:41,857 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:41,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 03:44:41,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:41,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 03:44:41,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:41,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:41,992 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:44:41,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658443620] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:41,992 INFO L184 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2022-11-03 03:44:41,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7, 6, 7, 6] total 12 [2022-11-03 03:44:41,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999622073] [2022-11-03 03:44:41,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:41,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:44:41,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:41,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:44:41,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2022-11-03 03:44:41,994 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:42,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:42,049 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2022-11-03 03:44:42,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:44:42,051 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-03 03:44:42,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:42,051 INFO L225 Difference]: With dead ends: 41 [2022-11-03 03:44:42,052 INFO L226 Difference]: Without dead ends: 41 [2022-11-03 03:44:42,052 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2022-11-03 03:44:42,053 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 17 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:42,053 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 30 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:44:42,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-03 03:44:42,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 37. [2022-11-03 03:44:42,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:42,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2022-11-03 03:44:42,056 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 14 [2022-11-03 03:44:42,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:42,057 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2022-11-03 03:44:42,057 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:42,057 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2022-11-03 03:44:42,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-03 03:44:42,058 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:42,058 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:42,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:42,281 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-11-03 03:44:42,467 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2022-11-03 03:44:42,660 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:42,661 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:42,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:42,661 INFO L85 PathProgramCache]: Analyzing trace with hash 262066236, now seen corresponding path program 1 times [2022-11-03 03:44:42,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:42,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1882158190] [2022-11-03 03:44:42,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:42,662 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:42,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:42,662 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:42,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2022-11-03 03:44:42,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:42,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 03:44:42,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:42,799 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:42,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:42,869 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:42,869 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:42,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1882158190] [2022-11-03 03:44:42,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1882158190] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:42,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1430887831] [2022-11-03 03:44:42,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:42,870 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:42,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:44:42,871 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:44:42,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2022-11-03 03:44:43,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:43,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 03:44:43,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:43,061 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:43,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:43,095 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:43,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1430887831] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:43,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444199592] [2022-11-03 03:44:43,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:43,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:43,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:43,098 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:43,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 03:44:43,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:43,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 03:44:43,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:43,204 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:43,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:43,236 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:43,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444199592] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:43,237 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:44:43,237 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2022-11-03 03:44:43,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049095676] [2022-11-03 03:44:43,237 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:43,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 03:44:43,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:43,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 03:44:43,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-03 03:44:43,239 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:43,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:43,312 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2022-11-03 03:44:43,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 03:44:43,313 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-03 03:44:43,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:43,314 INFO L225 Difference]: With dead ends: 47 [2022-11-03 03:44:43,314 INFO L226 Difference]: Without dead ends: 47 [2022-11-03 03:44:43,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-03 03:44:43,315 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 31 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:43,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 67 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:43,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-03 03:44:43,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2022-11-03 03:44:43,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 40 states have (on average 1.175) internal successors, (47), 42 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:43,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2022-11-03 03:44:43,319 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 16 [2022-11-03 03:44:43,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:43,319 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2022-11-03 03:44:43,319 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:43,319 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2022-11-03 03:44:43,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-03 03:44:43,320 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:43,320 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:43,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:43,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:43,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:43,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:43,933 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:43,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:43,933 INFO L85 PathProgramCache]: Analyzing trace with hash -749051014, now seen corresponding path program 1 times [2022-11-03 03:44:43,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:43,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2073658669] [2022-11-03 03:44:43,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:43,934 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:43,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:43,935 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:43,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2022-11-03 03:44:44,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:44,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 03:44:44,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:44,030 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:44,323 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:44,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:45,082 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:44:45,083 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:45,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2073658669] [2022-11-03 03:44:45,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2073658669] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:45,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1817428590] [2022-11-03 03:44:45,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:45,083 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:45,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:44:45,087 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:44:45,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2022-11-03 03:44:45,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:45,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 03:44:45,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:45,562 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:45,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:45,858 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:45,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1817428590] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:45,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203399161] [2022-11-03 03:44:45,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:45,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:45,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:45,863 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:45,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 03:44:45,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:45,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 03:44:45,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:45,999 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:45,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:46,049 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:46,049 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203399161] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:46,049 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:44:46,049 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 8, 7, 8, 7] total 23 [2022-11-03 03:44:46,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541122786] [2022-11-03 03:44:46,050 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:46,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-03 03:44:46,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:46,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-03 03:44:46,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2022-11-03 03:44:46,051 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:48,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:48,398 INFO L93 Difference]: Finished difference Result 71 states and 74 transitions. [2022-11-03 03:44:48,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-03 03:44:48,400 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-03 03:44:48,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:48,400 INFO L225 Difference]: With dead ends: 71 [2022-11-03 03:44:48,400 INFO L226 Difference]: Without dead ends: 71 [2022-11-03 03:44:48,401 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=316, Invalid=1244, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 03:44:48,402 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 172 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:48,402 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [172 Valid, 185 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 213 Invalid, 0 Unknown, 27 Unchecked, 0.7s Time] [2022-11-03 03:44:48,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-03 03:44:48,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 51. [2022-11-03 03:44:48,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 48 states have (on average 1.1875) internal successors, (57), 50 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:48,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2022-11-03 03:44:48,406 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 16 [2022-11-03 03:44:48,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:48,407 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2022-11-03 03:44:48,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:48,407 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2022-11-03 03:44:48,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-03 03:44:48,408 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:48,408 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:48,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:48,621 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (23)] Ended with exit code 0 [2022-11-03 03:44:48,841 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-11-03 03:44:49,020 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:49,020 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:49,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:49,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1557469017, now seen corresponding path program 1 times [2022-11-03 03:44:49,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:49,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [348315928] [2022-11-03 03:44:49,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:49,021 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:49,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:49,022 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:49,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2022-11-03 03:44:49,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:49,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 03:44:49,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:49,224 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:44:49,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:44:49,225 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:49,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [348315928] [2022-11-03 03:44:49,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [348315928] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:49,225 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:49,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 03:44:49,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253446238] [2022-11-03 03:44:49,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:49,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 03:44:49,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:49,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 03:44:49,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:44:49,227 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 5 states, 4 states have (on average 4.5) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:49,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:49,231 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2022-11-03 03:44:49,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:44:49,232 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-03 03:44:49,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:49,233 INFO L225 Difference]: With dead ends: 50 [2022-11-03 03:44:49,233 INFO L226 Difference]: Without dead ends: 35 [2022-11-03 03:44:49,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:44:49,234 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 3 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:49,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 44 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 8 Unchecked, 0.0s Time] [2022-11-03 03:44:49,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-03 03:44:49,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-03 03:44:49,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 33 states have (on average 1.121212121212121) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:49,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-11-03 03:44:49,238 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 18 [2022-11-03 03:44:49,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:49,238 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-11-03 03:44:49,238 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:49,238 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-11-03 03:44:49,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-03 03:44:49,240 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:49,240 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2022-11-03 03:44:49,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:49,452 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:44:49,452 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:49,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:49,453 INFO L85 PathProgramCache]: Analyzing trace with hash -1817992175, now seen corresponding path program 2 times [2022-11-03 03:44:49,453 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:49,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1883914621] [2022-11-03 03:44:49,453 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:44:49,453 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:49,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:49,454 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:49,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2022-11-03 03:44:49,515 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:44:49,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:49,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 03:44:49,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:49,553 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:49,900 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:49,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:51,035 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:51,035 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:44:51,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1883914621] [2022-11-03 03:44:51,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1883914621] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:51,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1704037877] [2022-11-03 03:44:51,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:44:51,036 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:51,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:44:51,039 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:44:51,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2022-11-03 03:44:51,170 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:44:51,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:51,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 03:44:51,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:51,236 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:51,541 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:51,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:52,018 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:52,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1704037877] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:52,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002145743] [2022-11-03 03:44:52,019 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:44:52,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:52,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:52,020 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:52,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-03 03:44:52,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:44:52,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:52,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 03:44:52,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:52,108 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:52,425 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:52,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:53,531 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:53,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002145743] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:53,532 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:44:53,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 8] total 24 [2022-11-03 03:44:53,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834635831] [2022-11-03 03:44:53,532 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:53,533 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-03 03:44:53,533 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:44:53,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-03 03:44:53,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=425, Unknown=0, NotChecked=0, Total=600 [2022-11-03 03:44:53,534 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 25 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:55,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:55,835 INFO L93 Difference]: Finished difference Result 115 states and 121 transitions. [2022-11-03 03:44:55,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 03:44:55,836 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-03 03:44:55,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:55,837 INFO L225 Difference]: With dead ends: 115 [2022-11-03 03:44:55,837 INFO L226 Difference]: Without dead ends: 115 [2022-11-03 03:44:55,837 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=292, Invalid=700, Unknown=0, NotChecked=0, Total=992 [2022-11-03 03:44:55,838 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 131 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:55,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 115 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 196 Invalid, 0 Unknown, 28 Unchecked, 0.9s Time] [2022-11-03 03:44:55,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-03 03:44:55,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 51. [2022-11-03 03:44:55,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 49 states have (on average 1.163265306122449) internal successors, (57), 50 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:55,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2022-11-03 03:44:55,843 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 18 [2022-11-03 03:44:55,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:55,844 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2022-11-03 03:44:55,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:55,844 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2022-11-03 03:44:55,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-03 03:44:55,845 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:55,845 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:55,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:56,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2022-11-03 03:44:56,261 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 0 [2022-11-03 03:44:56,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:44:56,459 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:44:56,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:56,460 INFO L85 PathProgramCache]: Analyzing trace with hash -1885902333, now seen corresponding path program 2 times [2022-11-03 03:44:56,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:44:56,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1965678478] [2022-11-03 03:44:56,460 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:44:56,460 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:44:56,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:44:56,461 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:44:56,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2022-11-03 03:44:56,550 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:44:56,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:56,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-03 03:44:56,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:56,576 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:44:57,349 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:57,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:01,134 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:01,134 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:45:01,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1965678478] [2022-11-03 03:45:01,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1965678478] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:01,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1566301456] [2022-11-03 03:45:01,135 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:45:01,135 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:45:01,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:45:01,136 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:45:01,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2022-11-03 03:45:01,281 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:45:01,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:01,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 03:45:01,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:02,332 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:45:02,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:03,700 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:45:03,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1566301456] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:03,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885812873] [2022-11-03 03:45:03,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:45:03,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:03,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:03,702 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:03,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-03 03:45:03,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:45:03,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:03,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 03:45:03,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:04,041 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:45:04,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:04,198 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:45:04,198 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885812873] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:04,198 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:45:04,198 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 11, 10, 11, 10] total 41 [2022-11-03 03:45:04,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595321233] [2022-11-03 03:45:04,199 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:04,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-03 03:45:04,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:45:04,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-03 03:45:04,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1456, Unknown=0, NotChecked=0, Total=1640 [2022-11-03 03:45:04,201 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 41 states, 41 states have (on average 2.341463414634146) internal successors, (96), 41 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:09,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:09,577 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2022-11-03 03:45:09,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-03 03:45:09,579 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.341463414634146) internal successors, (96), 41 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-11-03 03:45:09,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:09,580 INFO L225 Difference]: With dead ends: 77 [2022-11-03 03:45:09,580 INFO L226 Difference]: Without dead ends: 67 [2022-11-03 03:45:09,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 126 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 789 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=399, Invalid=2907, Unknown=0, NotChecked=0, Total=3306 [2022-11-03 03:45:09,581 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 75 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:09,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 175 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 204 Invalid, 0 Unknown, 21 Unchecked, 0.6s Time] [2022-11-03 03:45:09,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-03 03:45:09,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 56. [2022-11-03 03:45:09,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 55 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:09,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2022-11-03 03:45:09,586 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 28 [2022-11-03 03:45:09,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:09,586 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2022-11-03 03:45:09,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.341463414634146) internal successors, (96), 41 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:09,586 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2022-11-03 03:45:09,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-03 03:45:09,587 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:09,587 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:09,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:09,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:10,006 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2022-11-03 03:45:10,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:45:10,204 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:45:10,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:10,205 INFO L85 PathProgramCache]: Analyzing trace with hash 1844565766, now seen corresponding path program 3 times [2022-11-03 03:45:10,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:45:10,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1773837971] [2022-11-03 03:45:10,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:45:10,206 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:45:10,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:45:10,207 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:45:10,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2022-11-03 03:45:10,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 03:45:10,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:10,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 03:45:10,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:10,337 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:45:10,941 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:45:10,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:13,481 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:45:13,481 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:45:13,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1773837971] [2022-11-03 03:45:13,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1773837971] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:13,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1111355066] [2022-11-03 03:45:13,481 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:45:13,481 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:45:13,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:45:13,483 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:45:13,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2022-11-03 03:45:13,679 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 03:45:13,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:13,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 03:45:13,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:13,691 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:45:14,062 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:45:14,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:15,202 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:45:15,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1111355066] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:15,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687729749] [2022-11-03 03:45:15,202 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:45:15,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:15,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:15,203 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:15,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-03 03:45:15,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 03:45:15,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:15,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 03:45:15,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:16,335 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:16,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:17,726 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:17,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687729749] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:17,726 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:45:17,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 13, 12] total 40 [2022-11-03 03:45:17,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931694580] [2022-11-03 03:45:17,726 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:17,727 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-03 03:45:17,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:45:17,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-03 03:45:17,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1364, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 03:45:17,728 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand has 40 states, 40 states have (on average 2.6) internal successors, (104), 40 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:25,637 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:45:29,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:29,285 INFO L93 Difference]: Finished difference Result 99 states and 103 transitions. [2022-11-03 03:45:29,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-03 03:45:29,286 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.6) internal successors, (104), 40 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-03 03:45:29,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:29,287 INFO L225 Difference]: With dead ends: 99 [2022-11-03 03:45:29,287 INFO L226 Difference]: Without dead ends: 85 [2022-11-03 03:45:29,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1231 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=793, Invalid=3899, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 03:45:29,289 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 213 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:29,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 199 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 472 Invalid, 0 Unknown, 20 Unchecked, 4.5s Time] [2022-11-03 03:45:29,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-03 03:45:29,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2022-11-03 03:45:29,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 65 states have (on average 1.0923076923076922) internal successors, (71), 66 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:29,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 71 transitions. [2022-11-03 03:45:29,293 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 71 transitions. Word has length 32 [2022-11-03 03:45:29,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:29,293 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 71 transitions. [2022-11-03 03:45:29,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.6) internal successors, (104), 40 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:29,294 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 71 transitions. [2022-11-03 03:45:29,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-03 03:45:29,296 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:29,296 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2022-11-03 03:45:29,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:29,520 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-11-03 03:45:29,706 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2022-11-03 03:45:29,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:45:29,899 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:45:29,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:29,899 INFO L85 PathProgramCache]: Analyzing trace with hash -563143139, now seen corresponding path program 3 times [2022-11-03 03:45:29,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:45:29,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [942416199] [2022-11-03 03:45:29,900 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:45:29,900 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:45:29,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:45:29,901 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:45:29,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2022-11-03 03:45:30,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-03 03:45:30,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:30,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 03:45:30,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:30,116 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:45:30,951 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:30,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:35,016 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:35,016 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:45:35,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [942416199] [2022-11-03 03:45:35,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [942416199] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:35,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [121482271] [2022-11-03 03:45:35,017 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:45:35,017 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:45:35,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:45:35,018 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:45:35,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2022-11-03 03:45:35,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-03 03:45:35,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:35,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 03:45:35,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:35,572 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:45:36,464 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:36,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:44,432 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:44,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [121482271] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:44,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356875596] [2022-11-03 03:45:44,432 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:45:44,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:44,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:44,435 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:44,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-03 03:45:44,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-03 03:45:44,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:44,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 03:45:44,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:44,966 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:45:45,867 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:45,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:51,706 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:51,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356875596] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:51,706 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:45:51,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 13, 15, 14, 14] total 51 [2022-11-03 03:45:51,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892804186] [2022-11-03 03:45:51,707 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:51,707 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-03 03:45:51,707 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:45:51,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-03 03:45:51,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=732, Invalid=1920, Unknown=0, NotChecked=0, Total=2652 [2022-11-03 03:45:51,709 INFO L87 Difference]: Start difference. First operand 67 states and 71 transitions. Second operand has 52 states, 51 states have (on average 2.9607843137254903) internal successors, (151), 52 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:57,639 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:45:59,704 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:01,708 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:02,811 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:09,874 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:11,933 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:13,976 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:15,986 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:22,234 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:24,270 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:29,622 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:46:36,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:46:36,619 INFO L93 Difference]: Finished difference Result 419 states and 431 transitions. [2022-11-03 03:46:36,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-03 03:46:36,620 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 2.9607843137254903) internal successors, (151), 52 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-03 03:46:36,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:46:36,622 INFO L225 Difference]: With dead ends: 419 [2022-11-03 03:46:36,622 INFO L226 Difference]: Without dead ends: 419 [2022-11-03 03:46:36,623 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 149 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2068 ImplicationChecksByTransitivity, 30.8s TimeCoverageRelationStatistics Valid=1336, Invalid=3356, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 03:46:36,624 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 753 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 97 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 753 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 25.7s IncrementalHoareTripleChecker+Time [2022-11-03 03:46:36,624 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [753 Valid, 307 Invalid, 734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 596 Invalid, 10 Unknown, 31 Unchecked, 25.7s Time] [2022-11-03 03:46:36,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2022-11-03 03:46:36,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 99. [2022-11-03 03:46:36,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 97 states have (on average 1.1443298969072164) internal successors, (111), 98 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:36,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 111 transitions. [2022-11-03 03:46:36,631 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 111 transitions. Word has length 34 [2022-11-03 03:46:36,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:46:36,631 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 111 transitions. [2022-11-03 03:46:36,632 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 2.9607843137254903) internal successors, (151), 52 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:36,632 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 111 transitions. [2022-11-03 03:46:36,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-03 03:46:36,633 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:46:36,633 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:46:36,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-03 03:46:36,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2022-11-03 03:46:37,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2022-11-03 03:46:37,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:46:37,259 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:46:37,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:46:37,260 INFO L85 PathProgramCache]: Analyzing trace with hash -953948523, now seen corresponding path program 4 times [2022-11-03 03:46:37,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:46:37,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1899778398] [2022-11-03 03:46:37,260 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:46:37,260 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:46:37,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:46:37,261 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:46:37,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2022-11-03 03:46:37,433 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:46:37,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:46:37,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-03 03:46:37,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:37,476 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:46:39,022 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 26 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:39,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:46:47,889 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:47,890 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:46:47,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1899778398] [2022-11-03 03:46:47,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1899778398] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:46:47,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1255384546] [2022-11-03 03:46:47,891 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:46:47,891 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:46:47,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:46:47,895 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:46:47,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2022-11-03 03:46:48,128 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:46:48,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:46:48,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 03:46:48,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:50,461 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 55 proven. 56 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:46:50,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:46:53,811 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 55 proven. 56 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:46:53,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1255384546] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:46:53,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973745424] [2022-11-03 03:46:53,811 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:46:53,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:53,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:46:53,812 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:46:53,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-03 03:46:53,939 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:46:53,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:46:53,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-03 03:46:53,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:53,957 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:46:56,261 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-11-03 03:46:56,453 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 55 proven. 56 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:46:56,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:02,981 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 55 proven. 56 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:47:02,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973745424] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:02,981 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:47:02,981 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 20, 15, 14, 18, 17] total 82 [2022-11-03 03:47:02,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983254083] [2022-11-03 03:47:02,981 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:02,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-11-03 03:47:02,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:02,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-11-03 03:47:02,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=5996, Unknown=0, NotChecked=0, Total=6642 [2022-11-03 03:47:02,985 INFO L87 Difference]: Start difference. First operand 99 states and 111 transitions. Second operand has 82 states, 82 states have (on average 2.8048780487804876) internal successors, (230), 82 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:47,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:47,730 INFO L93 Difference]: Finished difference Result 187 states and 198 transitions. [2022-11-03 03:47:47,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-03 03:47:47,732 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.8048780487804876) internal successors, (230), 82 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-03 03:47:47,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:47,734 INFO L225 Difference]: With dead ends: 187 [2022-11-03 03:47:47,734 INFO L226 Difference]: Without dead ends: 169 [2022-11-03 03:47:47,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 231 SyntacticMatches, 3 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3960 ImplicationChecksByTransitivity, 57.7s TimeCoverageRelationStatistics Valid=2124, Invalid=13128, Unknown=0, NotChecked=0, Total=15252 [2022-11-03 03:47:47,738 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 607 mSDsluCounter, 408 mSDsCounter, 0 mSdLazyCounter, 1156 mSolverCounterSat, 305 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 607 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 1580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 305 IncrementalHoareTripleChecker+Valid, 1156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 119 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:47,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [607 Valid, 420 Invalid, 1580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [305 Valid, 1156 Invalid, 0 Unknown, 119 Unchecked, 7.4s Time] [2022-11-03 03:47:47,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2022-11-03 03:47:47,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 104. [2022-11-03 03:47:47,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 102 states have (on average 1.1274509803921569) internal successors, (115), 103 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:47,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 115 transitions. [2022-11-03 03:47:47,757 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 115 transitions. Word has length 52 [2022-11-03 03:47:47,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:47,757 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 115 transitions. [2022-11-03 03:47:47,757 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.8048780487804876) internal successors, (230), 82 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:47,757 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 115 transitions. [2022-11-03 03:47:47,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-03 03:47:47,759 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:47,759 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:47,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:47,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:48,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:48,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:48,368 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:47:48,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:48,368 INFO L85 PathProgramCache]: Analyzing trace with hash -494970789, now seen corresponding path program 5 times [2022-11-03 03:47:48,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:48,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1318991157] [2022-11-03 03:47:48,368 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-03 03:47:48,369 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:48,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:48,370 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:48,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2022-11-03 03:47:48,635 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2022-11-03 03:47:48,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:47:48,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-03 03:47:48,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:48,663 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:47:50,680 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 66 proven. 95 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:47:50,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:07,998 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 0 proven. 173 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:07,998 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:48:07,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1318991157] [2022-11-03 03:48:07,999 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1318991157] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:07,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1781932334] [2022-11-03 03:48:07,999 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-03 03:48:07,999 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:48:07,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:48:08,000 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:48:08,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2022-11-03 03:48:11,661 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2022-11-03 03:48:11,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:48:11,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 03:48:11,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:15,370 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 68 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:48:15,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:21,023 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 68 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:48:21,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1781932334] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:21,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883082213] [2022-11-03 03:48:21,023 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-03 03:48:21,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:21,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:48:21,024 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:48:21,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-03 03:48:24,580 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2022-11-03 03:48:24,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:48:24,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-03 03:48:24,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:24,599 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:48:29,506 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2022-11-03 03:48:30,291 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 68 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:48:30,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:40,017 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 68 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:48:40,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883082213] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:40,017 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:48:40,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 28, 17, 16, 21, 19] total 108 [2022-11-03 03:48:40,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946339253] [2022-11-03 03:48:40,017 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:48:40,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-11-03 03:48:40,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:48:40,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-11-03 03:48:40,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1002, Invalid=10554, Unknown=0, NotChecked=0, Total=11556 [2022-11-03 03:48:40,023 INFO L87 Difference]: Start difference. First operand 104 states and 115 transitions. Second operand has 108 states, 108 states have (on average 2.5833333333333335) internal successors, (279), 108 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:04,514 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:49:24,242 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:49:36,823 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:50:04,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:04,784 INFO L93 Difference]: Finished difference Result 201 states and 211 transitions. [2022-11-03 03:50:04,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-03 03:50:04,786 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 2.5833333333333335) internal successors, (279), 108 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-03 03:50:04,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:04,787 INFO L225 Difference]: With dead ends: 201 [2022-11-03 03:50:04,787 INFO L226 Difference]: Without dead ends: 179 [2022-11-03 03:50:04,791 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 251 SyntacticMatches, 1 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6342 ImplicationChecksByTransitivity, 107.4s TimeCoverageRelationStatistics Valid=2732, Invalid=19320, Unknown=0, NotChecked=0, Total=22052 [2022-11-03 03:50:04,791 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 605 mSDsluCounter, 553 mSDsCounter, 0 mSdLazyCounter, 1582 mSolverCounterSat, 351 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 605 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 2146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 351 IncrementalHoareTripleChecker+Valid, 1582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 213 IncrementalHoareTripleChecker+Unchecked, 15.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:04,792 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [605 Valid, 567 Invalid, 2146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [351 Valid, 1582 Invalid, 0 Unknown, 213 Unchecked, 15.0s Time] [2022-11-03 03:50:04,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-11-03 03:50:04,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 140. [2022-11-03 03:50:04,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 138 states have (on average 1.0942028985507246) internal successors, (151), 139 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:04,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 151 transitions. [2022-11-03 03:50:04,796 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 151 transitions. Word has length 60 [2022-11-03 03:50:04,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:04,797 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 151 transitions. [2022-11-03 03:50:04,797 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 2.5833333333333335) internal successors, (279), 108 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:04,797 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 151 transitions. [2022-11-03 03:50:04,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-03 03:50:04,799 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:04,799 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:04,807 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (42)] Ended with exit code 0 [2022-11-03 03:50:05,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:05,216 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (41)] Ended with exit code 0 [2022-11-03 03:50:05,407 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:50:05,407 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:50:05,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:05,408 INFO L85 PathProgramCache]: Analyzing trace with hash -749046242, now seen corresponding path program 6 times [2022-11-03 03:50:05,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:50:05,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [199406120] [2022-11-03 03:50:05,409 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-11-03 03:50:05,409 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:50:05,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:50:05,410 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:50:05,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2022-11-03 03:50:05,811 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2022-11-03 03:50:05,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:50:05,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-03 03:50:05,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:05,839 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:50:07,394 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-03 03:50:07,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:50:17,027 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-03 03:50:17,027 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:50:17,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [199406120] [2022-11-03 03:50:17,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [199406120] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:50:17,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [947962195] [2022-11-03 03:50:17,027 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-11-03 03:50:17,028 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:50:17,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:50:17,028 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:50:17,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2022-11-03 03:50:18,028 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2022-11-03 03:50:18,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:50:18,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-03 03:50:18,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:18,046 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:50:19,756 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-03 03:50:19,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:50:35,368 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-03 03:50:35,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [947962195] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:50:35,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596150161] [2022-11-03 03:50:35,368 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-11-03 03:50:35,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:35,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:35,369 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:35,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-03 03:50:37,227 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2022-11-03 03:50:37,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:50:37,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-03 03:50:37,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:37,253 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:50:43,998 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 7 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:50:43,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:51:05,656 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:05,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596150161] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:51:05,657 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:51:05,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 22, 22, 24, 27] total 94 [2022-11-03 03:51:05,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139495807] [2022-11-03 03:51:05,657 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:51:05,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-03 03:51:05,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:51:05,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-03 03:51:05,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1495, Invalid=7247, Unknown=0, NotChecked=0, Total=8742 [2022-11-03 03:51:05,659 INFO L87 Difference]: Start difference. First operand 140 states and 151 transitions. Second operand has 94 states, 94 states have (on average 2.425531914893617) internal successors, (228), 94 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:51:26,963 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:28,966 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:30,970 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:32,973 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:35,019 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:37,691 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:39,708 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:41,734 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:43,737 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:45,790 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:47,828 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:49,831 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:51:58,306 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:00,308 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:02,311 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:04,414 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:06,418 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:08,474 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:10,195 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:12,270 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:14,273 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:16,329 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:18,332 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:29,657 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:31,660 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:33,663 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:35,667 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:37,777 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:39,780 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:41,835 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:43,891 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:45,915 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:47,918 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:49,921 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:52,043 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:54,075 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:52:56,083 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:01,654 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:03,660 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.97s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:05,663 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:07,666 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:09,730 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:11,733 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:18,086 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:20,121 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:25,555 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:27,598 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:29,601 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:53:38,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:53:38,032 INFO L93 Difference]: Finished difference Result 229 states and 238 transitions. [2022-11-03 03:53:38,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-03 03:53:38,033 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.425531914893617) internal successors, (228), 94 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-03 03:53:38,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:53:38,034 INFO L225 Difference]: With dead ends: 229 [2022-11-03 03:53:38,034 INFO L226 Difference]: Without dead ends: 199 [2022-11-03 03:53:38,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 284 SyntacticMatches, 3 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8194 ImplicationChecksByTransitivity, 81.3s TimeCoverageRelationStatistics Valid=5184, Invalid=18996, Unknown=0, NotChecked=0, Total=24180 [2022-11-03 03:53:38,037 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 941 mSDsluCounter, 768 mSDsCounter, 0 mSdLazyCounter, 2328 mSolverCounterSat, 564 mSolverCounterUnsat, 45 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 109.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 941 SdHoareTripleChecker+Valid, 794 SdHoareTripleChecker+Invalid, 3012 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 564 IncrementalHoareTripleChecker+Valid, 2328 IncrementalHoareTripleChecker+Invalid, 45 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 110.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:53:38,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [941 Valid, 794 Invalid, 3012 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [564 Valid, 2328 Invalid, 45 Unknown, 75 Unchecked, 110.4s Time] [2022-11-03 03:53:38,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-11-03 03:53:38,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 131. [2022-11-03 03:53:38,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 130 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:53:38,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 140 transitions. [2022-11-03 03:53:38,042 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 140 transitions. Word has length 64 [2022-11-03 03:53:38,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:53:38,042 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 140 transitions. [2022-11-03 03:53:38,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 2.425531914893617) internal successors, (228), 94 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:53:38,043 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 140 transitions. [2022-11-03 03:53:38,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-03 03:53:38,043 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:53:38,044 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1] [2022-11-03 03:53:38,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2022-11-03 03:53:38,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (45)] Ended with exit code 0 [2022-11-03 03:53:38,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-11-03 03:53:38,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:53:38,647 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:53:38,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:53:38,648 INFO L85 PathProgramCache]: Analyzing trace with hash 58542645, now seen corresponding path program 4 times [2022-11-03 03:53:38,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:53:38,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [948983766] [2022-11-03 03:53:38,648 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:53:38,648 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:53:38,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:53:38,650 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:53:38,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2022-11-03 03:53:38,791 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:53:38,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:53:38,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 03:53:38,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:53:38,824 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:53:40,811 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:53:40,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:53:52,316 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:53:52,316 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:53:52,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [948983766] [2022-11-03 03:53:52,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [948983766] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:53:52,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [360707324] [2022-11-03 03:53:52,316 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:53:52,316 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:53:52,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:53:52,317 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:53:52,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2022-11-03 03:53:52,650 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:53:52,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:53:52,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 03:53:52,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:53:52,681 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:53:54,358 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:53:54,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:05,565 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:54:05,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [360707324] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:54:05,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384858538] [2022-11-03 03:54:05,565 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:54:05,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:54:05,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:54:05,566 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:54:05,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-03 03:54:05,754 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:54:05,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:54:05,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-03 03:54:05,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:05,773 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:54:08,813 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:54:08,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:32,883 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:54:32,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384858538] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:54:32,884 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:54:32,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 19, 19, 26, 26] total 105 [2022-11-03 03:54:32,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302335912] [2022-11-03 03:54:32,884 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:54:32,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-11-03 03:54:32,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:54:32,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-11-03 03:54:32,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2920, Invalid=8210, Unknown=0, NotChecked=0, Total=11130 [2022-11-03 03:54:32,888 INFO L87 Difference]: Start difference. First operand 131 states and 140 transitions. Second operand has 106 states, 105 states have (on average 3.104761904761905) internal successors, (326), 106 states have internal predecessors, (326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:43,472 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:54:45,480 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:54:47,483 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:54:49,486 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:54:51,489 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:54:53,491 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:54:55,494 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:54:57,497 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:03,349 WARN L234 SmtUtils]: Spent 5.27s on a formula simplification that was a NOOP. DAG size: 154 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 03:55:10,860 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:12,973 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:14,976 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:16,979 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:18,983 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:20,986 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:22,989 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:24,992 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:31,018 WARN L234 SmtUtils]: Spent 5.50s on a formula simplification that was a NOOP. DAG size: 144 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 03:55:37,615 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:39,655 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:41,658 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:43,662 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:45,665 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:47,715 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:55:49,717 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:10,165 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:12,229 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:14,233 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:16,219 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.95s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:18,265 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:20,268 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:29,283 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:36,749 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:43,427 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.87s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:49,398 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.64s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:55,011 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:56:59,511 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:57:03,505 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.63s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-03 03:57:10,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:57:10,239 INFO L93 Difference]: Finished difference Result 1667 states and 1692 transitions. [2022-11-03 03:57:10,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-03 03:57:10,243 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 105 states have (on average 3.104761904761905) internal successors, (326), 106 states have internal predecessors, (326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2022-11-03 03:57:10,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:57:10,247 INFO L225 Difference]: With dead ends: 1667 [2022-11-03 03:57:10,248 INFO L226 Difference]: Without dead ends: 1667 [2022-11-03 03:57:10,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8278 ImplicationChecksByTransitivity, 118.1s TimeCoverageRelationStatistics Valid=5451, Invalid=14289, Unknown=0, NotChecked=0, Total=19740 [2022-11-03 03:57:10,250 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 3116 mSDsluCounter, 1234 mSDsCounter, 0 mSdLazyCounter, 2434 mSolverCounterSat, 240 mSolverCounterUnsat, 31 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 78.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3116 SdHoareTripleChecker+Valid, 1280 SdHoareTripleChecker+Invalid, 2793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 2434 IncrementalHoareTripleChecker+Invalid, 31 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 78.8s IncrementalHoareTripleChecker+Time [2022-11-03 03:57:10,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3116 Valid, 1280 Invalid, 2793 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 2434 Invalid, 31 Unknown, 88 Unchecked, 78.8s Time] [2022-11-03 03:57:10,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1667 states. [2022-11-03 03:57:10,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1667 to 195. [2022-11-03 03:57:10,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 193 states have (on average 1.1398963730569949) internal successors, (220), 194 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:57:10,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 220 transitions. [2022-11-03 03:57:10,263 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 220 transitions. Word has length 66 [2022-11-03 03:57:10,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:57:10,264 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 220 transitions. [2022-11-03 03:57:10,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 105 states have (on average 3.104761904761905) internal successors, (326), 106 states have internal predecessors, (326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:57:10,264 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 220 transitions. [2022-11-03 03:57:10,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-03 03:57:10,265 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:57:10,265 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:57:10,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2022-11-03 03:57:10,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-03 03:57:10,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2022-11-03 03:57:10,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:57:10,880 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 03:57:10,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:57:10,880 INFO L85 PathProgramCache]: Analyzing trace with hash 870591795, now seen corresponding path program 7 times [2022-11-03 03:57:10,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:57:10,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [735966511] [2022-11-03 03:57:10,880 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:57:10,881 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:57:10,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:57:10,881 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:57:10,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2022-11-03 03:57:11,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:57:11,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-03 03:57:11,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:57:11,183 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:57:12,906 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 238 proven. 194 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-03 03:57:12,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:57:29,146 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 0 proven. 516 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:57:29,146 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:57:29,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [735966511] [2022-11-03 03:57:29,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [735966511] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:57:29,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1302481433] [2022-11-03 03:57:29,147 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:57:29,147 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:57:29,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:57:29,151 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:57:29,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2022-11-03 03:57:29,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:57:29,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-03 03:57:29,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:57:34,197 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 231 proven. 132 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-03 03:57:34,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:57:40,719 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 231 proven. 132 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-03 03:57:40,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1302481433] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:57:40,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436509213] [2022-11-03 03:57:40,719 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:57:40,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:57:40,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:57:40,722 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:57:40,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b0e858-e87f-47dd-8042-1df96122e7e4/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-03 03:57:40,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:57:40,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-03 03:57:40,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:57:40,920 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 03:57:46,595 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2022-11-03 03:57:46,619 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 231 proven. 132 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-03 03:57:46,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:58:04,205 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 231 proven. 132 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-03 03:58:04,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436509213] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:58:04,206 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:58:04,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 29, 20, 18, 24, 23] total 116 [2022-11-03 03:58:04,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338768674] [2022-11-03 03:58:04,206 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:58:04,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2022-11-03 03:58:04,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:58:04,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2022-11-03 03:58:04,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1033, Invalid=12307, Unknown=0, NotChecked=0, Total=13340 [2022-11-03 03:58:04,209 INFO L87 Difference]: Start difference. First operand 195 states and 220 transitions. Second operand has 116 states, 116 states have (on average 3.0086206896551726) internal successors, (349), 116 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)