./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ceb4cfb737a49cea9ea1be451c16ebb29f48ae611a8c94fc546ca2e3471f0eb3 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 18:52:57,272 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 18:52:57,275 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 18:52:57,324 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 18:52:57,325 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 18:52:57,332 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 18:52:57,339 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 18:52:57,341 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 18:52:57,343 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 18:52:57,344 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 18:52:57,345 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 18:52:57,347 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 18:52:57,347 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 18:52:57,349 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 18:52:57,352 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 18:52:57,355 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 18:52:57,358 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 18:52:57,367 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 18:52:57,371 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 18:52:57,378 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 18:52:57,380 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 18:52:57,384 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 18:52:57,385 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 18:52:57,386 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 18:52:57,390 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 18:52:57,390 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 18:52:57,391 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 18:52:57,392 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 18:52:57,392 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 18:52:57,393 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 18:52:57,393 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 18:52:57,394 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 18:52:57,397 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 18:52:57,400 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 18:52:57,401 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 18:52:57,401 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 18:52:57,402 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 18:52:57,402 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 18:52:57,403 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 18:52:57,406 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 18:52:57,407 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 18:52:57,408 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-20 18:52:57,451 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 18:52:57,451 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 18:52:57,452 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 18:52:57,452 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 18:52:57,453 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 18:52:57,453 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 18:52:57,454 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 18:52:57,454 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 18:52:57,454 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 18:52:57,454 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 18:52:57,456 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 18:52:57,456 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 18:52:57,456 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 18:52:57,456 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 18:52:57,457 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 18:52:57,457 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 18:52:57,457 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 18:52:57,457 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 18:52:57,460 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-20 18:52:57,461 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-20 18:52:57,461 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 18:52:57,461 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 18:52:57,461 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-20 18:52:57,462 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 18:52:57,462 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 18:52:57,463 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 18:52:57,463 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-20 18:52:57,463 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-20 18:52:57,463 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-20 18:52:57,464 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 18:52:57,464 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-20 18:52:57,464 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 18:52:57,464 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 18:52:57,465 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 18:52:57,465 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 18:52:57,465 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 18:52:57,466 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 18:52:57,466 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 18:52:57,466 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 18:52:57,466 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 18:52:57,471 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 18:52:57,471 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 18:52:57,471 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_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ceb4cfb737a49cea9ea1be451c16ebb29f48ae611a8c94fc546ca2e3471f0eb3 [2022-11-20 18:52:57,729 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 18:52:57,756 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 18:52:57,759 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 18:52:57,760 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 18:52:57,761 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 18:52:57,763 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c [2022-11-20 18:53:01,070 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 18:53:01,376 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 18:53:01,377 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c [2022-11-20 18:53:01,388 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/data/1ad2d2e25/6db13b8efc48430f97ba160846b736d2/FLAG956ee2b8d [2022-11-20 18:53:01,410 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/data/1ad2d2e25/6db13b8efc48430f97ba160846b736d2 [2022-11-20 18:53:01,413 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 18:53:01,415 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 18:53:01,417 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 18:53:01,417 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 18:53:01,421 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 18:53:01,422 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 06:53:01" (1/1) ... [2022-11-20 18:53:01,424 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d4959f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:01, skipping insertion in model container [2022-11-20 18:53:01,424 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 06:53:01" (1/1) ... [2022-11-20 18:53:01,433 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 18:53:01,456 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 18:53:01,659 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c[2586,2599] [2022-11-20 18:53:01,672 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 18:53:01,685 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2022-11-20 18:53:01,685 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@17a3483e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:01, skipping insertion in model container [2022-11-20 18:53:01,686 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 18:53:01,686 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-11-20 18:53:01,688 INFO L158 Benchmark]: Toolchain (without parser) took 272.25ms. Allocated memory is still 130.0MB. Free memory was 97.2MB in the beginning and 87.5MB in the end (delta: 9.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-11-20 18:53:01,688 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 130.0MB. Free memory is still 75.9MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-20 18:53:01,689 INFO L158 Benchmark]: CACSL2BoogieTranslator took 269.45ms. Allocated memory is still 130.0MB. Free memory was 96.7MB in the beginning and 87.5MB in the end (delta: 9.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-11-20 18:53:01,691 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 130.0MB. Free memory is still 75.9MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 269.45ms. Allocated memory is still 130.0MB. Free memory was 96.7MB in the beginning and 87.5MB in the end (delta: 9.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 109]: Unsupported Syntax Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ceb4cfb737a49cea9ea1be451c16ebb29f48ae611a8c94fc546ca2e3471f0eb3 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 18:53:04,237 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 18:53:04,240 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 18:53:04,278 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 18:53:04,278 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 18:53:04,283 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 18:53:04,286 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 18:53:04,292 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 18:53:04,295 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 18:53:04,297 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 18:53:04,299 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 18:53:04,302 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 18:53:04,304 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 18:53:04,307 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 18:53:04,309 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 18:53:04,312 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 18:53:04,314 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 18:53:04,316 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 18:53:04,318 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 18:53:04,327 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 18:53:04,334 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 18:53:04,340 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 18:53:04,341 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 18:53:04,342 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 18:53:04,346 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 18:53:04,349 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 18:53:04,349 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 18:53:04,351 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 18:53:04,351 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 18:53:04,354 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 18:53:04,354 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 18:53:04,356 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 18:53:04,358 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 18:53:04,359 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 18:53:04,361 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 18:53:04,361 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 18:53:04,363 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 18:53:04,366 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 18:53:04,367 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 18:53:04,368 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 18:53:04,369 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 18:53:04,370 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2022-11-20 18:53:04,421 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 18:53:04,422 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 18:53:04,423 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 18:53:04,423 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 18:53:04,424 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 18:53:04,425 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 18:53:04,425 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 18:53:04,425 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 18:53:04,425 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 18:53:04,426 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 18:53:04,427 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 18:53:04,427 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 18:53:04,428 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-20 18:53:04,428 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-20 18:53:04,429 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 18:53:04,429 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 18:53:04,429 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-20 18:53:04,429 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 18:53:04,429 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 18:53:04,430 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 18:53:04,430 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-20 18:53:04,430 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-20 18:53:04,430 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-20 18:53:04,431 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 18:53:04,431 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-20 18:53:04,449 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-11-20 18:53:04,449 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-11-20 18:53:04,449 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 18:53:04,449 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 18:53:04,450 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 18:53:04,450 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-20 18:53:04,450 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 18:53:04,450 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 18:53:04,450 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 18:53:04,451 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 18:53:04,451 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2022-11-20 18:53:04,451 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-11-20 18:53:04,451 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 18:53:04,451 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-11-20 18:53:04,451 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_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ceb4cfb737a49cea9ea1be451c16ebb29f48ae611a8c94fc546ca2e3471f0eb3 [2022-11-20 18:53:04,820 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 18:53:04,862 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 18:53:04,866 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 18:53:04,867 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 18:53:04,868 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 18:53:04,870 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c [2022-11-20 18:53:08,325 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 18:53:08,576 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 18:53:08,576 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c [2022-11-20 18:53:08,585 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/data/e69b5da68/0cef2d619d3b4342b8de0110a955edf7/FLAG9ab9f1b11 [2022-11-20 18:53:08,601 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/data/e69b5da68/0cef2d619d3b4342b8de0110a955edf7 [2022-11-20 18:53:08,604 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 18:53:08,606 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 18:53:08,607 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 18:53:08,607 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 18:53:08,613 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 18:53:08,615 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 06:53:08" (1/1) ... [2022-11-20 18:53:08,616 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12c52d59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:08, skipping insertion in model container [2022-11-20 18:53:08,616 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 06:53:08" (1/1) ... [2022-11-20 18:53:08,625 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 18:53:08,657 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 18:53:08,954 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c[2586,2599] [2022-11-20 18:53:08,988 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 18:53:09,011 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-11-20 18:53:09,026 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 18:53:09,049 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c[2586,2599] [2022-11-20 18:53:09,065 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 18:53:09,083 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 18:53:09,136 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/sv-benchmarks/c/weaver/popl20-more-min-array-hom.wvr.c[2586,2599] [2022-11-20 18:53:09,144 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 18:53:09,168 INFO L208 MainTranslator]: Completed translation [2022-11-20 18:53:09,170 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09 WrapperNode [2022-11-20 18:53:09,170 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 18:53:09,172 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 18:53:09,173 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 18:53:09,173 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 18:53:09,184 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,212 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,256 INFO L138 Inliner]: procedures = 26, calls = 43, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 99 [2022-11-20 18:53:09,257 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 18:53:09,259 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 18:53:09,259 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 18:53:09,259 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 18:53:09,271 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,299 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,300 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,308 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,316 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,332 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,334 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,337 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 18:53:09,338 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 18:53:09,350 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 18:53:09,350 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 18:53:09,351 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (1/1) ... [2022-11-20 18:53:09,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 18:53:09,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:53:09,428 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 18:53:09,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 18:53:09,485 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 18:53:09,486 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-11-20 18:53:09,486 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-20 18:53:09,486 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-11-20 18:53:09,486 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2022-11-20 18:53:09,487 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2022-11-20 18:53:09,487 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2022-11-20 18:53:09,487 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2022-11-20 18:53:09,487 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2022-11-20 18:53:09,487 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2022-11-20 18:53:09,488 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2022-11-20 18:53:09,488 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2022-11-20 18:53:09,488 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-20 18:53:09,488 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 18:53:09,489 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 18:53:09,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-20 18:53:09,489 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-11-20 18:53:09,491 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-11-20 18:53:09,641 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 18:53:09,643 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 18:53:10,307 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 18:53:10,525 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 18:53:10,530 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-11-20 18:53:10,533 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 06:53:10 BoogieIcfgContainer [2022-11-20 18:53:10,533 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 18:53:10,537 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 18:53:10,537 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 18:53:10,541 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 18:53:10,541 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 06:53:08" (1/3) ... [2022-11-20 18:53:10,542 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fcc7a28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 06:53:10, skipping insertion in model container [2022-11-20 18:53:10,542 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 06:53:09" (2/3) ... [2022-11-20 18:53:10,545 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fcc7a28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 06:53:10, skipping insertion in model container [2022-11-20 18:53:10,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 06:53:10" (3/3) ... [2022-11-20 18:53:10,547 INFO L112 eAbstractionObserver]: Analyzing ICFG popl20-more-min-array-hom.wvr.c [2022-11-20 18:53:10,571 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 18:53:10,571 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 28 error locations. [2022-11-20 18:53:10,572 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-11-20 18:53:10,725 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2022-11-20 18:53:10,781 INFO L115 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2022-11-20 18:53:10,816 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 179 places, 181 transitions, 386 flow [2022-11-20 18:53:10,821 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 179 places, 181 transitions, 386 flow [2022-11-20 18:53:10,824 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 179 places, 181 transitions, 386 flow [2022-11-20 18:53:10,965 INFO L130 PetriNetUnfolder]: 12/178 cut-off events. [2022-11-20 18:53:10,965 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2022-11-20 18:53:10,977 INFO L83 FinitePrefix]: Finished finitePrefix Result has 191 conditions, 178 events. 12/178 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 204 event pairs, 0 based on Foata normal form. 0/138 useless extension candidates. Maximal degree in co-relation 127. Up to 2 conditions per place. [2022-11-20 18:53:10,982 INFO L119 LiptonReduction]: Number of co-enabled transitions 2688 [2022-11-20 18:53:44,083 INFO L134 LiptonReduction]: Checked pairs total: 3576 [2022-11-20 18:53:44,084 INFO L136 LiptonReduction]: Total number of compositions: 178 [2022-11-20 18:53:44,092 INFO L113 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 61 places, 55 transitions, 134 flow [2022-11-20 18:53:44,237 INFO L135 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 1830 states, 1330 states have (on average 4.845112781954887) internal successors, (6444), 1829 states have internal predecessors, (6444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:44,256 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 18:53:44,263 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;@64b763c5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 18:53:44,264 INFO L358 AbstractCegarLoop]: Starting to check reachability of 43 error locations. [2022-11-20 18:53:44,271 INFO L276 IsEmpty]: Start isEmpty. Operand has 1830 states, 1330 states have (on average 4.845112781954887) internal successors, (6444), 1829 states have internal predecessors, (6444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:44,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-20 18:53:44,277 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:53:44,278 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-20 18:53:44,279 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:53:44,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:53:44,288 INFO L85 PathProgramCache]: Analyzing trace with hash 23267, now seen corresponding path program 1 times [2022-11-20 18:53:44,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:53:44,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1563359438] [2022-11-20 18:53:44,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:44,304 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:44,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:53:44,312 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:53:44,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-11-20 18:53:44,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:44,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 18:53:44,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:44,625 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 18:53:44,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 18:53:44,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:44,655 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:53:44,656 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:53:44,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1563359438] [2022-11-20 18:53:44,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1563359438] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:53:44,657 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:53:44,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 18:53:44,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286657762] [2022-11-20 18:53:44,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:53:44,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:53:44,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:53:44,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:53:44,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:44,696 INFO L87 Difference]: Start difference. First operand has 1830 states, 1330 states have (on average 4.845112781954887) internal successors, (6444), 1829 states have internal predecessors, (6444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:44,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:53:44,981 INFO L93 Difference]: Finished difference Result 748 states and 2564 transitions. [2022-11-20 18:53:44,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:53:44,984 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-20 18:53:44,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:53:45,005 INFO L225 Difference]: With dead ends: 748 [2022-11-20 18:53:45,005 INFO L226 Difference]: Without dead ends: 748 [2022-11-20 18:53:45,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:45,010 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 42 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:53:45,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 3 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 18:53:45,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 748 states. [2022-11-20 18:53:45,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 748 to 748. [2022-11-20 18:53:45,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 748 states, 616 states have (on average 4.162337662337662) internal successors, (2564), 747 states have internal predecessors, (2564), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:45,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 748 states to 748 states and 2564 transitions. [2022-11-20 18:53:45,104 INFO L78 Accepts]: Start accepts. Automaton has 748 states and 2564 transitions. Word has length 2 [2022-11-20 18:53:45,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:53:45,105 INFO L495 AbstractCegarLoop]: Abstraction has 748 states and 2564 transitions. [2022-11-20 18:53:45,106 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:45,106 INFO L276 IsEmpty]: Start isEmpty. Operand 748 states and 2564 transitions. [2022-11-20 18:53:45,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-20 18:53:45,106 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:53:45,106 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-20 18:53:45,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:45,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:45,320 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:53:45,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:53:45,320 INFO L85 PathProgramCache]: Analyzing trace with hash 23268, now seen corresponding path program 1 times [2022-11-20 18:53:45,321 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:53:45,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [446332623] [2022-11-20 18:53:45,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:45,321 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:45,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:53:45,326 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:53:45,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-11-20 18:53:45,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:45,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 18:53:45,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:45,677 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:53:45,677 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:53:45,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:45,709 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:53:45,710 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:53:45,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [446332623] [2022-11-20 18:53:45,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [446332623] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:53:45,710 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:53:45,710 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 18:53:45,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000364800] [2022-11-20 18:53:45,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:53:45,712 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:53:45,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:53:45,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:53:45,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:45,713 INFO L87 Difference]: Start difference. First operand 748 states and 2564 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:46,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:53:46,132 INFO L93 Difference]: Finished difference Result 1494 states and 5126 transitions. [2022-11-20 18:53:46,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:53:46,133 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-20 18:53:46,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:53:46,147 INFO L225 Difference]: With dead ends: 1494 [2022-11-20 18:53:46,147 INFO L226 Difference]: Without dead ends: 1494 [2022-11-20 18:53:46,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:46,156 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 40 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 18:53:46,157 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 6 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 18:53:46,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1494 states. [2022-11-20 18:53:46,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1494 to 749. [2022-11-20 18:53:46,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 749 states, 617 states have (on average 4.162074554294976) internal successors, (2568), 748 states have internal predecessors, (2568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:46,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 749 states to 749 states and 2568 transitions. [2022-11-20 18:53:46,276 INFO L78 Accepts]: Start accepts. Automaton has 749 states and 2568 transitions. Word has length 2 [2022-11-20 18:53:46,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:53:46,277 INFO L495 AbstractCegarLoop]: Abstraction has 749 states and 2568 transitions. [2022-11-20 18:53:46,277 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:46,277 INFO L276 IsEmpty]: Start isEmpty. Operand 749 states and 2568 transitions. [2022-11-20 18:53:46,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-20 18:53:46,278 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:53:46,278 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-20 18:53:46,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:46,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:46,487 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:53:46,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:53:46,488 INFO L85 PathProgramCache]: Analyzing trace with hash 23423, now seen corresponding path program 1 times [2022-11-20 18:53:46,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:53:46,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [21483111] [2022-11-20 18:53:46,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:46,488 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:46,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:53:46,490 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:53:46,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-11-20 18:53:46,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:46,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 18:53:46,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:46,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:46,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:53:46,630 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:53:46,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [21483111] [2022-11-20 18:53:46,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [21483111] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:53:46,631 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:53:46,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 18:53:46,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343908460] [2022-11-20 18:53:46,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:53:46,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:53:46,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:53:46,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:53:46,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:46,633 INFO L87 Difference]: Start difference. First operand 749 states and 2568 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:46,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:53:46,912 INFO L93 Difference]: Finished difference Result 749 states and 2565 transitions. [2022-11-20 18:53:46,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:53:46,913 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-20 18:53:46,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:53:46,919 INFO L225 Difference]: With dead ends: 749 [2022-11-20 18:53:46,919 INFO L226 Difference]: Without dead ends: 749 [2022-11-20 18:53:46,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:46,920 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 18:53:46,921 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 18:53:46,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 749 states. [2022-11-20 18:53:46,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 749 to 749. [2022-11-20 18:53:46,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 749 states, 617 states have (on average 4.157212317666127) internal successors, (2565), 748 states have internal predecessors, (2565), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:46,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 749 states to 749 states and 2565 transitions. [2022-11-20 18:53:46,951 INFO L78 Accepts]: Start accepts. Automaton has 749 states and 2565 transitions. Word has length 2 [2022-11-20 18:53:46,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:53:46,952 INFO L495 AbstractCegarLoop]: Abstraction has 749 states and 2565 transitions. [2022-11-20 18:53:46,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:46,952 INFO L276 IsEmpty]: Start isEmpty. Operand 749 states and 2565 transitions. [2022-11-20 18:53:46,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 18:53:46,952 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:53:46,953 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 18:53:46,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:47,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:47,164 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:53:47,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:53:47,165 INFO L85 PathProgramCache]: Analyzing trace with hash 725604, now seen corresponding path program 1 times [2022-11-20 18:53:47,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:53:47,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1321642107] [2022-11-20 18:53:47,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:47,165 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:47,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:53:47,166 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:53:47,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-11-20 18:53:47,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:47,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:53:47,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:47,401 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:53:47,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:53:47,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:47,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:53:47,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:47,739 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:53:47,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1321642107] [2022-11-20 18:53:47,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1321642107] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:53:47,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1365451716] [2022-11-20 18:53:47,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:47,740 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:53:47,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:53:47,745 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:53:47,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2022-11-20 18:53:47,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:47,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:53:47,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:48,060 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:53:48,061 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:53:48,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:48,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:53:48,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:48,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1365451716] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:53:48,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537239620] [2022-11-20 18:53:48,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:48,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:53:48,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:53:48,183 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:53:48,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 18:53:48,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:48,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 18:53:48,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:48,438 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:53:48,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:53:48,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:48,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:53:48,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:48,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537239620] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:53:48,706 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:53:48,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2, 2, 2, 2] total 6 [2022-11-20 18:53:48,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183972137] [2022-11-20 18:53:48,706 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:53:48,707 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 18:53:48,707 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:53:48,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 18:53:48,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-11-20 18:53:48,708 INFO L87 Difference]: Start difference. First operand 749 states and 2565 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:50,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:53:50,821 INFO L93 Difference]: Finished difference Result 2242 states and 7693 transitions. [2022-11-20 18:53:50,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 18:53:50,823 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-20 18:53:50,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:53:50,841 INFO L225 Difference]: With dead ends: 2242 [2022-11-20 18:53:50,842 INFO L226 Difference]: Without dead ends: 2242 [2022-11-20 18:53:50,842 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2022-11-20 18:53:50,843 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 277 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-20 18:53:50,844 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [277 Valid, 15 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-20 18:53:50,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2242 states. [2022-11-20 18:53:50,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2242 to 752. [2022-11-20 18:53:50,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 752 states, 620 states have (on average 4.156451612903226) internal successors, (2577), 751 states have internal predecessors, (2577), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:50,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 752 states to 752 states and 2577 transitions. [2022-11-20 18:53:50,893 INFO L78 Accepts]: Start accepts. Automaton has 752 states and 2577 transitions. Word has length 3 [2022-11-20 18:53:50,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:53:50,893 INFO L495 AbstractCegarLoop]: Abstraction has 752 states and 2577 transitions. [2022-11-20 18:53:50,894 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:50,894 INFO L276 IsEmpty]: Start isEmpty. Operand 752 states and 2577 transitions. [2022-11-20 18:53:50,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 18:53:50,894 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:53:50,895 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 18:53:50,902 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (6)] Ended with exit code 0 [2022-11-20 18:53:51,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:51,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:51,497 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:53:51,498 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:53:51,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:53:51,498 INFO L85 PathProgramCache]: Analyzing trace with hash 725759, now seen corresponding path program 1 times [2022-11-20 18:53:51,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:53:51,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [734267172] [2022-11-20 18:53:51,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:51,499 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:51,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:53:51,500 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:53:51,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-11-20 18:53:51,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:51,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:53:51,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:51,702 INFO L321 Elim1Store]: treesize reduction 111, result has 19.0 percent of original size [2022-11-20 18:53:51,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 6 case distinctions, treesize of input 38 treesize of output 51 [2022-11-20 18:53:51,771 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:53:51,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:53:51,771 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:53:51,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [734267172] [2022-11-20 18:53:51,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [734267172] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:53:51,772 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:53:51,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 18:53:51,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886472674] [2022-11-20 18:53:51,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:53:51,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:53:51,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:53:51,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:53:51,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:51,774 INFO L87 Difference]: Start difference. First operand 752 states and 2577 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:51,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:53:51,931 INFO L93 Difference]: Finished difference Result 751 states and 2573 transitions. [2022-11-20 18:53:51,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:53:51,932 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-20 18:53:51,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:53:51,938 INFO L225 Difference]: With dead ends: 751 [2022-11-20 18:53:51,938 INFO L226 Difference]: Without dead ends: 751 [2022-11-20 18:53:51,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:51,940 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:53:51,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 38 Unchecked, 0.1s Time] [2022-11-20 18:53:51,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2022-11-20 18:53:51,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 751. [2022-11-20 18:53:51,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 751 states, 620 states have (on average 4.15) internal successors, (2573), 750 states have internal predecessors, (2573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:51,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 751 states to 751 states and 2573 transitions. [2022-11-20 18:53:51,986 INFO L78 Accepts]: Start accepts. Automaton has 751 states and 2573 transitions. Word has length 3 [2022-11-20 18:53:51,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:53:51,987 INFO L495 AbstractCegarLoop]: Abstraction has 751 states and 2573 transitions. [2022-11-20 18:53:51,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:51,987 INFO L276 IsEmpty]: Start isEmpty. Operand 751 states and 2573 transitions. [2022-11-20 18:53:51,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 18:53:51,988 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:53:51,988 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 18:53:52,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:52,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:52,201 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:53:52,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:53:52,201 INFO L85 PathProgramCache]: Analyzing trace with hash 725760, now seen corresponding path program 1 times [2022-11-20 18:53:52,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:53:52,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [257352465] [2022-11-20 18:53:52,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:52,202 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:52,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:53:52,203 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:53:52,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-11-20 18:53:52,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:52,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 18:53:52,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:52,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:53:52,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:53:52,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:53:52,455 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-20 18:53:52,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 33 [2022-11-20 18:53:52,493 INFO L321 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-11-20 18:53:52,494 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 19 [2022-11-20 18:53:52,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:52,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:53:52,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:52,739 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:53:52,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [257352465] [2022-11-20 18:53:52,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [257352465] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-20 18:53:52,739 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 18:53:52,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 4 [2022-11-20 18:53:52,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436325447] [2022-11-20 18:53:52,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:53:52,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 18:53:52,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:53:52,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 18:53:52,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-20 18:53:52,741 INFO L87 Difference]: Start difference. First operand 751 states and 2573 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:52,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:53:52,985 INFO L93 Difference]: Finished difference Result 625 states and 2069 transitions. [2022-11-20 18:53:52,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:53:52,986 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-20 18:53:52,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:53:52,990 INFO L225 Difference]: With dead ends: 625 [2022-11-20 18:53:52,991 INFO L226 Difference]: Without dead ends: 625 [2022-11-20 18:53:52,991 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-20 18:53:52,992 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:53:52,992 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 3 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 18:53:52,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2022-11-20 18:53:53,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 625. [2022-11-20 18:53:53,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 625 states, 522 states have (on average 3.9636015325670497) internal successors, (2069), 624 states have internal predecessors, (2069), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:53,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 625 states to 625 states and 2069 transitions. [2022-11-20 18:53:53,014 INFO L78 Accepts]: Start accepts. Automaton has 625 states and 2069 transitions. Word has length 3 [2022-11-20 18:53:53,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:53:53,015 INFO L495 AbstractCegarLoop]: Abstraction has 625 states and 2069 transitions. [2022-11-20 18:53:53,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:53,015 INFO L276 IsEmpty]: Start isEmpty. Operand 625 states and 2069 transitions. [2022-11-20 18:53:53,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-20 18:53:53,015 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:53:53,016 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-20 18:53:53,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:53,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:53,229 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:53:53,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:53:53,229 INFO L85 PathProgramCache]: Analyzing trace with hash 697470199, now seen corresponding path program 1 times [2022-11-20 18:53:53,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:53:53,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1249025164] [2022-11-20 18:53:53,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:53,230 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:53,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:53:53,231 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:53:53,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2022-11-20 18:53:53,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:53,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:53:53,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:53,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:53:53,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:53:53,483 INFO L321 Elim1Store]: treesize reduction 49, result has 38.8 percent of original size [2022-11-20 18:53:53,484 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 38 [2022-11-20 18:53:53,507 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2022-11-20 18:53:53,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:53,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:53:54,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:54,058 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:53:54,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1249025164] [2022-11-20 18:53:54,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1249025164] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:53:54,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1741315202] [2022-11-20 18:53:54,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:54,059 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:53:54,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:53:54,060 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:53:54,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2022-11-20 18:53:54,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:54,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 18:53:54,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:54,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:53:54,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:53:54,376 INFO L321 Elim1Store]: treesize reduction 49, result has 33.8 percent of original size [2022-11-20 18:53:54,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 35 [2022-11-20 18:53:54,396 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2022-11-20 18:53:54,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:53:54,518 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:53:54,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1741315202] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:53:54,518 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 18:53:54,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 18:53:54,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231387271] [2022-11-20 18:53:54,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:53:54,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:53:54,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:53:54,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:53:54,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:53:54,520 INFO L87 Difference]: Start difference. First operand 625 states and 2069 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:54,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:53:54,663 INFO L93 Difference]: Finished difference Result 625 states and 2073 transitions. [2022-11-20 18:53:54,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:53:54,664 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-20 18:53:54,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:53:54,670 INFO L225 Difference]: With dead ends: 625 [2022-11-20 18:53:54,670 INFO L226 Difference]: Without dead ends: 625 [2022-11-20 18:53:54,670 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:53:54,671 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:53:54,672 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 6 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 36 Unchecked, 0.1s Time] [2022-11-20 18:53:54,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2022-11-20 18:53:54,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 625. [2022-11-20 18:53:54,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 625 states, 522 states have (on average 3.971264367816092) internal successors, (2073), 624 states have internal predecessors, (2073), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:54,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 625 states to 625 states and 2073 transitions. [2022-11-20 18:53:54,696 INFO L78 Accepts]: Start accepts. Automaton has 625 states and 2073 transitions. Word has length 5 [2022-11-20 18:53:54,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:53:54,696 INFO L495 AbstractCegarLoop]: Abstraction has 625 states and 2073 transitions. [2022-11-20 18:53:54,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:54,697 INFO L276 IsEmpty]: Start isEmpty. Operand 625 states and 2073 transitions. [2022-11-20 18:53:54,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-20 18:53:54,697 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:53:54,697 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-20 18:53:54,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:54,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:55,109 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:53:55,110 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:53:55,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:53:55,111 INFO L85 PathProgramCache]: Analyzing trace with hash 697470198, now seen corresponding path program 1 times [2022-11-20 18:53:55,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:53:55,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [783461336] [2022-11-20 18:53:55,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:53:55,111 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:55,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:53:55,112 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:53:55,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-11-20 18:53:55,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:53:55,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:53:55,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:55,325 INFO L321 Elim1Store]: treesize reduction 105, result has 17.3 percent of original size [2022-11-20 18:53:55,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 40 [2022-11-20 18:53:55,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:53:55,478 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:53:55,478 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:53:55,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [783461336] [2022-11-20 18:53:55,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [783461336] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:53:55,479 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:53:55,479 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 18:53:55,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117990419] [2022-11-20 18:53:55,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:53:55,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:53:55,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:53:55,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:53:55,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:55,481 INFO L87 Difference]: Start difference. First operand 625 states and 2073 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:55,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:53:55,621 INFO L93 Difference]: Finished difference Result 624 states and 2070 transitions. [2022-11-20 18:53:55,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:53:55,622 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-20 18:53:55,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:53:55,627 INFO L225 Difference]: With dead ends: 624 [2022-11-20 18:53:55,627 INFO L226 Difference]: Without dead ends: 624 [2022-11-20 18:53:55,627 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:53:55,628 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:53:55,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 6 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 36 Unchecked, 0.1s Time] [2022-11-20 18:53:55,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2022-11-20 18:53:55,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 624. [2022-11-20 18:53:55,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 624 states, 521 states have (on average 3.9731285988483687) internal successors, (2070), 623 states have internal predecessors, (2070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:55,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 624 states to 624 states and 2070 transitions. [2022-11-20 18:53:55,654 INFO L78 Accepts]: Start accepts. Automaton has 624 states and 2070 transitions. Word has length 5 [2022-11-20 18:53:55,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:53:55,655 INFO L495 AbstractCegarLoop]: Abstraction has 624 states and 2070 transitions. [2022-11-20 18:53:55,655 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:53:55,655 INFO L276 IsEmpty]: Start isEmpty. Operand 624 states and 2070 transitions. [2022-11-20 18:53:55,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 18:53:55,656 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:53:55,656 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1] [2022-11-20 18:53:55,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-11-20 18:53:55,870 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:55,871 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:53:55,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:53:55,871 INFO L85 PathProgramCache]: Analyzing trace with hash 145898212, now seen corresponding path program 2 times [2022-11-20 18:53:55,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:53:55,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1978136720] [2022-11-20 18:53:55,872 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:53:55,872 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:53:55,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:53:55,873 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:53:55,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2022-11-20 18:53:56,005 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:53:56,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:53:56,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 18:53:56,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:56,196 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:53:56,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:53:56,405 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:56,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:53:57,204 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:57,204 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:53:57,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1978136720] [2022-11-20 18:53:57,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1978136720] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:53:57,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [879918863] [2022-11-20 18:53:57,205 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:53:57,205 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:53:57,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:53:57,207 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:53:57,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2022-11-20 18:53:57,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:53:57,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:53:57,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 18:53:57,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:57,571 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:53:57,571 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:53:57,679 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:57,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:53:58,628 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:58,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [879918863] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:53:58,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1750702471] [2022-11-20 18:53:58,628 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:53:58,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:53:58,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:53:58,629 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:53:58,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-20 18:53:58,769 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:53:58,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:53:58,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 18:53:58,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:53:58,928 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:53:58,928 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:53:59,032 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:59,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:53:59,239 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:53:59,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1750702471] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:53:59,239 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:53:59,239 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 15 [2022-11-20 18:53:59,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951364441] [2022-11-20 18:53:59,240 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:53:59,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-20 18:53:59,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:53:59,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-20 18:53:59,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=182, Unknown=0, NotChecked=0, Total=272 [2022-11-20 18:53:59,241 INFO L87 Difference]: Start difference. First operand 624 states and 2070 transitions. Second operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:05,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:05,022 INFO L93 Difference]: Finished difference Result 5566 states and 18554 transitions. [2022-11-20 18:54:05,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 18:54:05,024 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 18:54:05,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:05,067 INFO L225 Difference]: With dead ends: 5566 [2022-11-20 18:54:05,067 INFO L226 Difference]: Without dead ends: 5566 [2022-11-20 18:54:05,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=152, Invalid=268, Unknown=0, NotChecked=0, Total=420 [2022-11-20 18:54:05,069 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1369 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 894 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1369 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 894 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:05,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1369 Valid, 75 Invalid, 911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 894 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-11-20 18:54:05,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5566 states. [2022-11-20 18:54:05,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5566 to 630. [2022-11-20 18:54:05,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 630 states, 527 states have (on average 3.950664136622391) internal successors, (2082), 629 states have internal predecessors, (2082), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:05,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 630 states to 630 states and 2082 transitions. [2022-11-20 18:54:05,174 INFO L78 Accepts]: Start accepts. Automaton has 630 states and 2082 transitions. Word has length 6 [2022-11-20 18:54:05,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:05,174 INFO L495 AbstractCegarLoop]: Abstraction has 630 states and 2082 transitions. [2022-11-20 18:54:05,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:05,175 INFO L276 IsEmpty]: Start isEmpty. Operand 630 states and 2082 transitions. [2022-11-20 18:54:05,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 18:54:05,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:05,176 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-20 18:54:05,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:05,391 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (13)] Ended with exit code 0 [2022-11-20 18:54:05,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:05,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:05,784 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:05,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:05,785 INFO L85 PathProgramCache]: Analyzing trace with hash 146734139, now seen corresponding path program 1 times [2022-11-20 18:54:05,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:05,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1002817491] [2022-11-20 18:54:05,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:05,785 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:05,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:05,787 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:05,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-11-20 18:54:05,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:05,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-20 18:54:05,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:05,984 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 18:54:05,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 18:54:06,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:06,011 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:06,011 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:06,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1002817491] [2022-11-20 18:54:06,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1002817491] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:06,012 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:54:06,012 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 18:54:06,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484078474] [2022-11-20 18:54:06,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:06,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 18:54:06,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:06,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 18:54:06,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 18:54:06,013 INFO L87 Difference]: Start difference. First operand 630 states and 2082 transitions. Second operand has 4 states, 3 states have (on average 2.0) 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) [2022-11-20 18:54:06,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:06,212 INFO L93 Difference]: Finished difference Result 367 states and 1178 transitions. [2022-11-20 18:54:06,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 18:54:06,213 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) 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 [2022-11-20 18:54:06,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:06,216 INFO L225 Difference]: With dead ends: 367 [2022-11-20 18:54:06,216 INFO L226 Difference]: Without dead ends: 367 [2022-11-20 18:54:06,216 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 [2022-11-20 18:54:06,217 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 66 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:06,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 3 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 18:54:06,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2022-11-20 18:54:06,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 367. [2022-11-20 18:54:06,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 326 states have (on average 3.6134969325153374) internal successors, (1178), 366 states have internal predecessors, (1178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:06,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 1178 transitions. [2022-11-20 18:54:06,248 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 1178 transitions. Word has length 6 [2022-11-20 18:54:06,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:06,248 INFO L495 AbstractCegarLoop]: Abstraction has 367 states and 1178 transitions. [2022-11-20 18:54:06,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) 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) [2022-11-20 18:54:06,249 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 1178 transitions. [2022-11-20 18:54:06,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 18:54:06,249 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:06,249 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-20 18:54:06,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:06,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:06,463 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:06,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:06,463 INFO L85 PathProgramCache]: Analyzing trace with hash 146734140, now seen corresponding path program 1 times [2022-11-20 18:54:06,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:06,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [411559213] [2022-11-20 18:54:06,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:06,464 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:06,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:06,466 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:06,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2022-11-20 18:54:06,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:06,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 18:54:06,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:06,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:06,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:06,878 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 18:54:06,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:06,954 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:06,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [411559213] [2022-11-20 18:54:06,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [411559213] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:06,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1779984430] [2022-11-20 18:54:06,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:06,954 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:06,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:06,956 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:06,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2022-11-20 18:54:07,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:07,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 18:54:07,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:07,285 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:07,286 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:07,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:07,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:07,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:07,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1779984430] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:07,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781670077] [2022-11-20 18:54:07,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:07,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:54:07,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:54:07,951 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:54:07,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-20 18:54:08,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:08,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 18:54:08,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:08,194 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:08,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:08,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:08,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:08,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:08,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781670077] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:08,422 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:54:08,422 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 14 [2022-11-20 18:54:08,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818805505] [2022-11-20 18:54:08,423 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:54:08,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-20 18:54:08,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:08,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-20 18:54:08,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2022-11-20 18:54:08,424 INFO L87 Difference]: Start difference. First operand 367 states and 1178 transitions. Second operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:09,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:09,979 INFO L93 Difference]: Finished difference Result 371 states and 1184 transitions. [2022-11-20 18:54:09,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 18:54:09,980 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 18:54:09,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:09,982 INFO L225 Difference]: With dead ends: 371 [2022-11-20 18:54:09,983 INFO L226 Difference]: Without dead ends: 371 [2022-11-20 18:54:09,983 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=102, Invalid=318, Unknown=0, NotChecked=0, Total=420 [2022-11-20 18:54:09,984 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 68 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:09,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 34 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 292 Invalid, 0 Unknown, 68 Unchecked, 1.3s Time] [2022-11-20 18:54:09,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-11-20 18:54:09,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 367. [2022-11-20 18:54:09,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 326 states have (on average 3.6104294478527605) internal successors, (1177), 366 states have internal predecessors, (1177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:09,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 1177 transitions. [2022-11-20 18:54:09,996 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 1177 transitions. Word has length 6 [2022-11-20 18:54:09,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:09,996 INFO L495 AbstractCegarLoop]: Abstraction has 367 states and 1177 transitions. [2022-11-20 18:54:09,997 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:09,997 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 1177 transitions. [2022-11-20 18:54:09,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 18:54:09,997 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:09,997 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:10,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:10,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:10,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:10,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:10,611 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:10,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:10,611 INFO L85 PathProgramCache]: Analyzing trace with hash 253793607, now seen corresponding path program 1 times [2022-11-20 18:54:10,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:10,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1255720053] [2022-11-20 18:54:10,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:10,612 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:10,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:10,613 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:10,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2022-11-20 18:54:10,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:10,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:54:10,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:10,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:10,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:10,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:10,945 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:10,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1255720053] [2022-11-20 18:54:10,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1255720053] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:10,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1820794012] [2022-11-20 18:54:10,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:10,945 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:10,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:10,946 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:10,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2022-11-20 18:54:11,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:11,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 18:54:11,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:11,186 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:11,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:11,228 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:11,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1820794012] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:11,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619758502] [2022-11-20 18:54:11,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:11,229 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:54:11,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:54:11,230 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:54:11,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-20 18:54:11,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:11,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-20 18:54:11,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:11,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:11,395 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:11,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619758502] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:11,396 INFO L184 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2022-11-20 18:54:11,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 5, 5, 5] total 13 [2022-11-20 18:54:11,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538575633] [2022-11-20 18:54:11,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:11,397 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 18:54:11,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:11,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 18:54:11,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2022-11-20 18:54:11,398 INFO L87 Difference]: Start difference. First operand 367 states and 1177 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:11,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:11,743 INFO L93 Difference]: Finished difference Result 497 states and 1628 transitions. [2022-11-20 18:54:11,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 18:54:11,743 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 18:54:11,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:11,746 INFO L225 Difference]: With dead ends: 497 [2022-11-20 18:54:11,747 INFO L226 Difference]: Without dead ends: 497 [2022-11-20 18:54:11,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2022-11-20 18:54:11,748 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 50 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:11,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 7 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 18:54:11,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 497 states. [2022-11-20 18:54:11,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 497 to 432. [2022-11-20 18:54:11,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 391 states have (on average 3.7519181585677748) internal successors, (1467), 431 states have internal predecessors, (1467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:11,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1467 transitions. [2022-11-20 18:54:11,765 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1467 transitions. Word has length 7 [2022-11-20 18:54:11,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:11,765 INFO L495 AbstractCegarLoop]: Abstraction has 432 states and 1467 transitions. [2022-11-20 18:54:11,766 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:11,766 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1467 transitions. [2022-11-20 18:54:11,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 18:54:11,767 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:11,767 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:11,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:11,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:12,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:12,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:12,375 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:12,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:12,376 INFO L85 PathProgramCache]: Analyzing trace with hash 253794196, now seen corresponding path program 1 times [2022-11-20 18:54:12,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:12,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1303343289] [2022-11-20 18:54:12,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:12,376 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:12,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:12,377 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:12,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2022-11-20 18:54:12,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:12,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:54:12,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:12,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:12,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:12,713 INFO L321 Elim1Store]: treesize reduction 49, result has 38.8 percent of original size [2022-11-20 18:54:12,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 38 [2022-11-20 18:54:12,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2022-11-20 18:54:13,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:13,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:13,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:13,410 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:13,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1303343289] [2022-11-20 18:54:13,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1303343289] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:13,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2090234884] [2022-11-20 18:54:13,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:13,411 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:13,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:13,413 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:13,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2022-11-20 18:54:13,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:13,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 18:54:13,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:13,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:13,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:13,870 INFO L321 Elim1Store]: treesize reduction 49, result has 33.8 percent of original size [2022-11-20 18:54:13,870 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 35 [2022-11-20 18:54:13,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 38 [2022-11-20 18:54:14,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:14,051 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:14,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2090234884] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:14,051 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 18:54:14,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 18:54:14,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064764730] [2022-11-20 18:54:14,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:14,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:14,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:14,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:14,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:14,054 INFO L87 Difference]: Start difference. First operand 432 states and 1467 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:14,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:14,177 INFO L93 Difference]: Finished difference Result 431 states and 1463 transitions. [2022-11-20 18:54:14,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:14,178 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 18:54:14,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:14,180 INFO L225 Difference]: With dead ends: 431 [2022-11-20 18:54:14,180 INFO L226 Difference]: Without dead ends: 431 [2022-11-20 18:54:14,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:14,181 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:14,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 33 Unchecked, 0.1s Time] [2022-11-20 18:54:14,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2022-11-20 18:54:14,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 431. [2022-11-20 18:54:14,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 390 states have (on average 3.7512820512820513) internal successors, (1463), 430 states have internal predecessors, (1463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:14,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 1463 transitions. [2022-11-20 18:54:14,197 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 1463 transitions. Word has length 7 [2022-11-20 18:54:14,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:14,197 INFO L495 AbstractCegarLoop]: Abstraction has 431 states and 1463 transitions. [2022-11-20 18:54:14,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:14,198 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 1463 transitions. [2022-11-20 18:54:14,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 18:54:14,199 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:14,199 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:14,212 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (23)] Ended with exit code 0 [2022-11-20 18:54:14,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (24)] Ended with exit code 0 [2022-11-20 18:54:14,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:14,611 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:14,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:14,612 INFO L85 PathProgramCache]: Analyzing trace with hash 253794113, now seen corresponding path program 1 times [2022-11-20 18:54:14,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:14,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [974157816] [2022-11-20 18:54:14,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:14,613 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:14,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:14,614 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:14,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2022-11-20 18:54:14,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:14,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:54:14,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:14,909 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:14,910 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:15,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:15,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:15,664 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:15,664 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:15,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [974157816] [2022-11-20 18:54:15,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [974157816] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:15,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1286793478] [2022-11-20 18:54:15,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:15,665 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:15,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:15,668 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:15,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2022-11-20 18:54:15,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:15,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 18:54:15,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:16,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:16,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:16,462 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:16,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1286793478] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:16,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126039460] [2022-11-20 18:54:16,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:16,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:54:16,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:54:16,464 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:54:16,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-20 18:54:16,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:16,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 18:54:16,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:16,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:16,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:16,695 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:16,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126039460] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:16,696 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:54:16,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 5, 5, 5, 5] total 18 [2022-11-20 18:54:16,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260461352] [2022-11-20 18:54:16,697 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:54:16,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-20 18:54:16,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:16,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-20 18:54:16,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-11-20 18:54:16,698 INFO L87 Difference]: Start difference. First operand 431 states and 1463 transitions. Second operand has 20 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:21,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:21,024 INFO L93 Difference]: Finished difference Result 1132 states and 3756 transitions. [2022-11-20 18:54:21,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 18:54:21,025 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 18:54:21,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:21,030 INFO L225 Difference]: With dead ends: 1132 [2022-11-20 18:54:21,030 INFO L226 Difference]: Without dead ends: 1132 [2022-11-20 18:54:21,031 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=250, Invalid=806, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 18:54:21,031 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 782 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 577 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 782 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:21,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [782 Valid, 60 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 577 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-20 18:54:21,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1132 states. [2022-11-20 18:54:21,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1132 to 832. [2022-11-20 18:54:21,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 832 states, 791 states have (on average 3.7623261694058154) internal successors, (2976), 831 states have internal predecessors, (2976), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:21,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 832 states to 832 states and 2976 transitions. [2022-11-20 18:54:21,066 INFO L78 Accepts]: Start accepts. Automaton has 832 states and 2976 transitions. Word has length 7 [2022-11-20 18:54:21,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:21,067 INFO L495 AbstractCegarLoop]: Abstraction has 832 states and 2976 transitions. [2022-11-20 18:54:21,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:21,067 INFO L276 IsEmpty]: Start isEmpty. Operand 832 states and 2976 transitions. [2022-11-20 18:54:21,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 18:54:21,068 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:21,068 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:21,076 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-11-20 18:54:21,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:21,484 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (25)] Ended with exit code 0 [2022-11-20 18:54:21,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:21,676 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:21,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:21,677 INFO L85 PathProgramCache]: Analyzing trace with hash 253794195, now seen corresponding path program 1 times [2022-11-20 18:54:21,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:21,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [157699093] [2022-11-20 18:54:21,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:21,678 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:21,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:21,679 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:21,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2022-11-20 18:54:21,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:21,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:54:21,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:21,913 INFO L321 Elim1Store]: treesize reduction 105, result has 17.3 percent of original size [2022-11-20 18:54:21,914 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 40 [2022-11-20 18:54:22,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:22,103 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:22,104 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:22,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [157699093] [2022-11-20 18:54:22,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [157699093] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:22,104 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:54:22,105 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 18:54:22,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660368003] [2022-11-20 18:54:22,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:22,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:22,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:22,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:22,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:22,107 INFO L87 Difference]: Start difference. First operand 832 states and 2976 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:22,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:22,247 INFO L93 Difference]: Finished difference Result 827 states and 2961 transitions. [2022-11-20 18:54:22,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:22,248 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 18:54:22,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:22,251 INFO L225 Difference]: With dead ends: 827 [2022-11-20 18:54:22,251 INFO L226 Difference]: Without dead ends: 827 [2022-11-20 18:54:22,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:22,252 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:22,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 33 Unchecked, 0.1s Time] [2022-11-20 18:54:22,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 827 states. [2022-11-20 18:54:22,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 827 to 827. [2022-11-20 18:54:22,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 786 states have (on average 3.767175572519084) internal successors, (2961), 826 states have internal predecessors, (2961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:22,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 2961 transitions. [2022-11-20 18:54:22,283 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 2961 transitions. Word has length 7 [2022-11-20 18:54:22,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:22,283 INFO L495 AbstractCegarLoop]: Abstraction has 827 states and 2961 transitions. [2022-11-20 18:54:22,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:22,284 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 2961 transitions. [2022-11-20 18:54:22,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 18:54:22,285 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:22,285 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:22,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (28)] Ended with exit code 0 [2022-11-20 18:54:22,499 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:22,500 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:22,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:22,500 INFO L85 PathProgramCache]: Analyzing trace with hash 253977843, now seen corresponding path program 1 times [2022-11-20 18:54:22,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:22,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1234286643] [2022-11-20 18:54:22,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:22,501 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:22,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:22,502 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:22,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2022-11-20 18:54:22,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:22,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 18:54:22,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:22,756 INFO L321 Elim1Store]: treesize reduction 105, result has 17.3 percent of original size [2022-11-20 18:54:22,756 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 29 [2022-11-20 18:54:22,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:22,798 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:22,798 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:22,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1234286643] [2022-11-20 18:54:22,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1234286643] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:22,799 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:54:22,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 18:54:22,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370317095] [2022-11-20 18:54:22,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:22,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:22,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:22,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:22,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:22,801 INFO L87 Difference]: Start difference. First operand 827 states and 2961 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:23,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:23,007 INFO L93 Difference]: Finished difference Result 779 states and 2809 transitions. [2022-11-20 18:54:23,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:23,008 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 18:54:23,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:23,012 INFO L225 Difference]: With dead ends: 779 [2022-11-20 18:54:23,013 INFO L226 Difference]: Without dead ends: 779 [2022-11-20 18:54:23,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:23,014 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:23,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 3 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 18:54:23,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 779 states. [2022-11-20 18:54:23,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 779 to 779. [2022-11-20 18:54:23,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 779 states, 744 states have (on average 3.775537634408602) internal successors, (2809), 778 states have internal predecessors, (2809), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:23,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 779 states to 779 states and 2809 transitions. [2022-11-20 18:54:23,042 INFO L78 Accepts]: Start accepts. Automaton has 779 states and 2809 transitions. Word has length 7 [2022-11-20 18:54:23,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:23,042 INFO L495 AbstractCegarLoop]: Abstraction has 779 states and 2809 transitions. [2022-11-20 18:54:23,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:23,043 INFO L276 IsEmpty]: Start isEmpty. Operand 779 states and 2809 transitions. [2022-11-20 18:54:23,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 18:54:23,043 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:23,043 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:23,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:23,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:23,259 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:23,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:23,259 INFO L85 PathProgramCache]: Analyzing trace with hash 253977844, now seen corresponding path program 1 times [2022-11-20 18:54:23,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:23,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1386912600] [2022-11-20 18:54:23,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:23,260 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:23,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:23,261 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:23,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2022-11-20 18:54:23,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:23,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:54:23,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:23,584 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:23,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:23,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:23,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:24,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:24,172 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:24,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1386912600] [2022-11-20 18:54:24,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1386912600] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:24,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [326237426] [2022-11-20 18:54:24,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:24,173 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:24,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:24,174 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:24,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2022-11-20 18:54:24,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:24,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 18:54:24,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:24,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:24,631 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 18:54:24,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 18:54:24,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:24,776 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:24,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [326237426] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:24,776 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 18:54:24,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 18:54:24,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680543002] [2022-11-20 18:54:24,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:24,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:24,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:24,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:24,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:24,778 INFO L87 Difference]: Start difference. First operand 779 states and 2809 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:24,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:24,893 INFO L93 Difference]: Finished difference Result 779 states and 2817 transitions. [2022-11-20 18:54:24,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:24,893 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 18:54:24,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:24,898 INFO L225 Difference]: With dead ends: 779 [2022-11-20 18:54:24,898 INFO L226 Difference]: Without dead ends: 779 [2022-11-20 18:54:24,898 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:24,899 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:24,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 6 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 31 Unchecked, 0.1s Time] [2022-11-20 18:54:24,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 779 states. [2022-11-20 18:54:24,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 779 to 779. [2022-11-20 18:54:24,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 779 states, 744 states have (on average 3.786290322580645) internal successors, (2817), 778 states have internal predecessors, (2817), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:24,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 779 states to 779 states and 2817 transitions. [2022-11-20 18:54:24,925 INFO L78 Accepts]: Start accepts. Automaton has 779 states and 2817 transitions. Word has length 7 [2022-11-20 18:54:24,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:24,925 INFO L495 AbstractCegarLoop]: Abstraction has 779 states and 2817 transitions. [2022-11-20 18:54:24,925 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:24,925 INFO L276 IsEmpty]: Start isEmpty. Operand 779 states and 2817 transitions. [2022-11-20 18:54:24,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 18:54:24,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:24,926 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:24,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:25,139 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (30)] Ended with exit code 0 [2022-11-20 18:54:25,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:25,330 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:25,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:25,331 INFO L85 PathProgramCache]: Analyzing trace with hash -722314526, now seen corresponding path program 1 times [2022-11-20 18:54:25,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:25,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2052629390] [2022-11-20 18:54:25,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:25,331 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:25,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:25,332 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:25,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2022-11-20 18:54:25,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:25,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 18:54:25,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:25,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:25,657 INFO L321 Elim1Store]: treesize reduction 65, result has 34.3 percent of original size [2022-11-20 18:54:25,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 41 [2022-11-20 18:54:25,684 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 38 [2022-11-20 18:54:26,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:26,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:26,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:26,364 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:26,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2052629390] [2022-11-20 18:54:26,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2052629390] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:26,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [119934635] [2022-11-20 18:54:26,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:26,365 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:26,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:26,367 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:26,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2022-11-20 18:54:26,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:26,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 18:54:26,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:26,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:26,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:26,864 INFO L321 Elim1Store]: treesize reduction 49, result has 33.8 percent of original size [2022-11-20 18:54:26,865 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 35 [2022-11-20 18:54:26,888 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 37 [2022-11-20 18:54:27,095 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 18:54:27,095 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:27,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [119934635] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:27,096 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 18:54:27,096 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 18:54:27,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615850819] [2022-11-20 18:54:27,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:27,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:27,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:27,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:27,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:27,097 INFO L87 Difference]: Start difference. First operand 779 states and 2817 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:27,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:27,238 INFO L93 Difference]: Finished difference Result 778 states and 2816 transitions. [2022-11-20 18:54:27,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:27,238 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-20 18:54:27,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:27,243 INFO L225 Difference]: With dead ends: 778 [2022-11-20 18:54:27,243 INFO L226 Difference]: Without dead ends: 778 [2022-11-20 18:54:27,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:27,244 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:27,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 31 Unchecked, 0.1s Time] [2022-11-20 18:54:27,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2022-11-20 18:54:27,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 778. [2022-11-20 18:54:27,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 778 states, 744 states have (on average 3.78494623655914) internal successors, (2816), 777 states have internal predecessors, (2816), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:27,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 778 states to 778 states and 2816 transitions. [2022-11-20 18:54:27,292 INFO L78 Accepts]: Start accepts. Automaton has 778 states and 2816 transitions. Word has length 8 [2022-11-20 18:54:27,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:27,293 INFO L495 AbstractCegarLoop]: Abstraction has 778 states and 2816 transitions. [2022-11-20 18:54:27,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:27,293 INFO L276 IsEmpty]: Start isEmpty. Operand 778 states and 2816 transitions. [2022-11-20 18:54:27,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 18:54:27,299 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:27,299 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:27,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:27,516 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (33)] Ended with exit code 0 [2022-11-20 18:54:27,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:27,714 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:27,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:27,715 INFO L85 PathProgramCache]: Analyzing trace with hash -722314527, now seen corresponding path program 1 times [2022-11-20 18:54:27,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:27,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1312217603] [2022-11-20 18:54:27,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:27,715 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:27,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:27,717 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:27,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2022-11-20 18:54:27,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:27,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 18:54:27,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:27,950 INFO L321 Elim1Store]: treesize reduction 101, result has 20.5 percent of original size [2022-11-20 18:54:27,951 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 44 [2022-11-20 18:54:27,992 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 18:54:27,992 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:27,992 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:27,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1312217603] [2022-11-20 18:54:27,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1312217603] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:27,992 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:54:27,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 18:54:27,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872441649] [2022-11-20 18:54:27,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:27,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:27,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:27,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:27,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:27,994 INFO L87 Difference]: Start difference. First operand 778 states and 2816 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:28,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:28,171 INFO L93 Difference]: Finished difference Result 760 states and 2766 transitions. [2022-11-20 18:54:28,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:28,171 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-20 18:54:28,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:28,175 INFO L225 Difference]: With dead ends: 760 [2022-11-20 18:54:28,175 INFO L226 Difference]: Without dead ends: 760 [2022-11-20 18:54:28,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:28,176 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:28,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 3 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 18:54:28,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 760 states. [2022-11-20 18:54:28,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 760 to 760. [2022-11-20 18:54:28,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 760 states, 732 states have (on average 3.778688524590164) internal successors, (2766), 759 states have internal predecessors, (2766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:28,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 760 states to 760 states and 2766 transitions. [2022-11-20 18:54:28,214 INFO L78 Accepts]: Start accepts. Automaton has 760 states and 2766 transitions. Word has length 8 [2022-11-20 18:54:28,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:28,214 INFO L495 AbstractCegarLoop]: Abstraction has 760 states and 2766 transitions. [2022-11-20 18:54:28,215 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:28,215 INFO L276 IsEmpty]: Start isEmpty. Operand 760 states and 2766 transitions. [2022-11-20 18:54:28,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 18:54:28,215 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:28,216 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:28,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:28,430 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:28,431 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:28,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:28,431 INFO L85 PathProgramCache]: Analyzing trace with hash -716626654, now seen corresponding path program 1 times [2022-11-20 18:54:28,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:28,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1934441106] [2022-11-20 18:54:28,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:28,432 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:28,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:28,433 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:28,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2022-11-20 18:54:28,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:28,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 18:54:28,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:28,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:28,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:28,973 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 18:54:29,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:29,069 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:29,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1934441106] [2022-11-20 18:54:29,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1934441106] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:29,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [381283743] [2022-11-20 18:54:29,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:29,070 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:29,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:29,072 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:29,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2022-11-20 18:54:29,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:29,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:54:29,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:29,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:29,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:29,888 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:29,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [381283743] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:29,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282983229] [2022-11-20 18:54:29,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:29,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:54:29,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:54:29,890 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:54:29,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-20 18:54:30,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:30,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 18:54:30,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:30,203 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:30,204 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:30,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:30,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:31,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:31,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282983229] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:31,149 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:54:31,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 22 [2022-11-20 18:54:31,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798373604] [2022-11-20 18:54:31,149 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:54:31,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 18:54:31,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:31,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 18:54:31,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2022-11-20 18:54:31,151 INFO L87 Difference]: Start difference. First operand 760 states and 2766 transitions. Second operand has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:33,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:33,184 INFO L93 Difference]: Finished difference Result 761 states and 2763 transitions. [2022-11-20 18:54:33,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 18:54:33,185 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-20 18:54:33,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:33,189 INFO L225 Difference]: With dead ends: 761 [2022-11-20 18:54:33,189 INFO L226 Difference]: Without dead ends: 761 [2022-11-20 18:54:33,190 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=161, Invalid=831, Unknown=0, NotChecked=0, Total=992 [2022-11-20 18:54:33,191 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 26 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:33,191 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 63 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 343 Invalid, 0 Unknown, 56 Unchecked, 1.4s Time] [2022-11-20 18:54:33,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 761 states. [2022-11-20 18:54:33,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 761 to 760. [2022-11-20 18:54:33,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 760 states, 732 states have (on average 3.773224043715847) internal successors, (2762), 759 states have internal predecessors, (2762), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:33,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 760 states to 760 states and 2762 transitions. [2022-11-20 18:54:33,217 INFO L78 Accepts]: Start accepts. Automaton has 760 states and 2762 transitions. Word has length 8 [2022-11-20 18:54:33,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:33,218 INFO L495 AbstractCegarLoop]: Abstraction has 760 states and 2762 transitions. [2022-11-20 18:54:33,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:33,218 INFO L276 IsEmpty]: Start isEmpty. Operand 760 states and 2762 transitions. [2022-11-20 18:54:33,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 18:54:33,219 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:33,219 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:33,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:33,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:33,636 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (35)] Ended with exit code 0 [2022-11-20 18:54:33,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:33,827 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:33,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:33,828 INFO L85 PathProgramCache]: Analyzing trace with hash -916898735, now seen corresponding path program 1 times [2022-11-20 18:54:33,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:33,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1019842796] [2022-11-20 18:54:33,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:33,829 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:33,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:33,830 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:33,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2022-11-20 18:54:34,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:34,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:54:34,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:34,218 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:34,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:34,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:34,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:34,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:34,839 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:34,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1019842796] [2022-11-20 18:54:34,839 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1019842796] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:34,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1568288938] [2022-11-20 18:54:34,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:34,840 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:34,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:34,841 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:34,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2022-11-20 18:54:35,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:35,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 18:54:35,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:35,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:35,383 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 18:54:35,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 18:54:35,542 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:35,542 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:35,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1568288938] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:35,542 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 18:54:35,542 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 18:54:35,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257952578] [2022-11-20 18:54:35,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:35,543 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:35,543 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:35,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:35,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:35,544 INFO L87 Difference]: Start difference. First operand 760 states and 2762 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:35,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:35,638 INFO L93 Difference]: Finished difference Result 760 states and 2772 transitions. [2022-11-20 18:54:35,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:35,639 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 18:54:35,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:35,643 INFO L225 Difference]: With dead ends: 760 [2022-11-20 18:54:35,643 INFO L226 Difference]: Without dead ends: 760 [2022-11-20 18:54:35,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:35,644 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:35,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 6 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 30 Unchecked, 0.1s Time] [2022-11-20 18:54:35,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 760 states. [2022-11-20 18:54:35,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 760 to 760. [2022-11-20 18:54:35,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 760 states, 732 states have (on average 3.7868852459016393) internal successors, (2772), 759 states have internal predecessors, (2772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:35,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 760 states to 760 states and 2772 transitions. [2022-11-20 18:54:35,669 INFO L78 Accepts]: Start accepts. Automaton has 760 states and 2772 transitions. Word has length 9 [2022-11-20 18:54:35,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:35,670 INFO L495 AbstractCegarLoop]: Abstraction has 760 states and 2772 transitions. [2022-11-20 18:54:35,670 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:35,670 INFO L276 IsEmpty]: Start isEmpty. Operand 760 states and 2772 transitions. [2022-11-20 18:54:35,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 18:54:35,671 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:35,671 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:35,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:35,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:36,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:36,091 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:36,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:36,091 INFO L85 PathProgramCache]: Analyzing trace with hash -740413980, now seen corresponding path program 1 times [2022-11-20 18:54:36,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:36,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [471185890] [2022-11-20 18:54:36,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:36,092 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:36,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:36,093 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:36,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2022-11-20 18:54:36,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:36,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 18:54:36,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:36,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:36,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:36,666 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 18:54:36,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:36,772 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:36,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [471185890] [2022-11-20 18:54:36,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [471185890] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:36,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1481131822] [2022-11-20 18:54:36,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:36,773 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:36,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:36,775 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:36,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2022-11-20 18:54:37,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:37,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:54:37,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:37,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:37,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:37,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:37,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1481131822] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:37,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390481144] [2022-11-20 18:54:37,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:37,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:54:37,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:54:37,607 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:54:37,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-20 18:54:37,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:37,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 18:54:37,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:37,894 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:37,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:38,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:38,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:38,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:38,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390481144] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:38,801 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:54:38,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 22 [2022-11-20 18:54:38,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036007601] [2022-11-20 18:54:38,802 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:54:38,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 18:54:38,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:38,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 18:54:38,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2022-11-20 18:54:38,804 INFO L87 Difference]: Start difference. First operand 760 states and 2772 transitions. Second operand has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:40,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:40,569 INFO L93 Difference]: Finished difference Result 769 states and 2809 transitions. [2022-11-20 18:54:40,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 18:54:40,571 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 18:54:40,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:40,575 INFO L225 Difference]: With dead ends: 769 [2022-11-20 18:54:40,575 INFO L226 Difference]: Without dead ends: 769 [2022-11-20 18:54:40,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=161, Invalid=831, Unknown=0, NotChecked=0, Total=992 [2022-11-20 18:54:40,576 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 27 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:40,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 58 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 273 Invalid, 0 Unknown, 56 Unchecked, 1.2s Time] [2022-11-20 18:54:40,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 769 states. [2022-11-20 18:54:40,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 769 to 764. [2022-11-20 18:54:40,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 736 states have (on average 3.7880434782608696) internal successors, (2788), 763 states have internal predecessors, (2788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:40,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 2788 transitions. [2022-11-20 18:54:40,602 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 2788 transitions. Word has length 9 [2022-11-20 18:54:40,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:40,603 INFO L495 AbstractCegarLoop]: Abstraction has 764 states and 2788 transitions. [2022-11-20 18:54:40,603 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:40,603 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 2788 transitions. [2022-11-20 18:54:40,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 18:54:40,604 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:40,604 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:40,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:40,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:41,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:41,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:54:41,219 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:41,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:41,220 INFO L85 PathProgramCache]: Analyzing trace with hash -740412915, now seen corresponding path program 1 times [2022-11-20 18:54:41,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:41,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [649742147] [2022-11-20 18:54:41,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:41,220 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:41,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:41,221 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:41,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2022-11-20 18:54:41,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:41,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 18:54:41,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:41,415 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:41,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:41,415 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:41,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [649742147] [2022-11-20 18:54:41,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [649742147] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:41,415 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:54:41,415 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 18:54:41,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548505437] [2022-11-20 18:54:41,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:41,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:41,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:41,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:41,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:41,417 INFO L87 Difference]: Start difference. First operand 764 states and 2788 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:41,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:41,594 INFO L93 Difference]: Finished difference Result 588 states and 2036 transitions. [2022-11-20 18:54:41,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:41,595 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 18:54:41,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:41,597 INFO L225 Difference]: With dead ends: 588 [2022-11-20 18:54:41,598 INFO L226 Difference]: Without dead ends: 588 [2022-11-20 18:54:41,598 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:41,598 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:41,599 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 3 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 18:54:41,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2022-11-20 18:54:41,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 588. [2022-11-20 18:54:41,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 588 states, 568 states have (on average 3.584507042253521) internal successors, (2036), 587 states have internal predecessors, (2036), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:41,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 588 states to 588 states and 2036 transitions. [2022-11-20 18:54:41,617 INFO L78 Accepts]: Start accepts. Automaton has 588 states and 2036 transitions. Word has length 9 [2022-11-20 18:54:41,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:41,618 INFO L495 AbstractCegarLoop]: Abstraction has 588 states and 2036 transitions. [2022-11-20 18:54:41,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:41,618 INFO L276 IsEmpty]: Start isEmpty. Operand 588 states and 2036 transitions. [2022-11-20 18:54:41,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 18:54:41,619 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:41,619 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:41,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:41,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:41,834 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:41,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:41,834 INFO L85 PathProgramCache]: Analyzing trace with hash -740586960, now seen corresponding path program 2 times [2022-11-20 18:54:41,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:41,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [3828792] [2022-11-20 18:54:41,835 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:54:41,835 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:41,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:41,836 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:41,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2022-11-20 18:54:41,988 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 18:54:41,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:54:41,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:54:41,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:42,171 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:42,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:42,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:42,401 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:42,401 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:42,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [3828792] [2022-11-20 18:54:42,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [3828792] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:42,402 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:54:42,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 18:54:42,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622696426] [2022-11-20 18:54:42,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:42,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 18:54:42,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:42,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 18:54:42,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-20 18:54:42,403 INFO L87 Difference]: Start difference. First operand 588 states and 2036 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:42,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:42,628 INFO L93 Difference]: Finished difference Result 592 states and 2052 transitions. [2022-11-20 18:54:42,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 18:54:42,629 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 18:54:42,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:42,632 INFO L225 Difference]: With dead ends: 592 [2022-11-20 18:54:42,632 INFO L226 Difference]: Without dead ends: 592 [2022-11-20 18:54:42,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-20 18:54:42,633 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 5 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:42,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 12 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 30 Unchecked, 0.2s Time] [2022-11-20 18:54:42,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2022-11-20 18:54:42,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 588. [2022-11-20 18:54:42,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 588 states, 568 states have (on average 3.584507042253521) internal successors, (2036), 587 states have internal predecessors, (2036), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:42,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 588 states to 588 states and 2036 transitions. [2022-11-20 18:54:42,652 INFO L78 Accepts]: Start accepts. Automaton has 588 states and 2036 transitions. Word has length 9 [2022-11-20 18:54:42,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:42,652 INFO L495 AbstractCegarLoop]: Abstraction has 588 states and 2036 transitions. [2022-11-20 18:54:42,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:42,652 INFO L276 IsEmpty]: Start isEmpty. Operand 588 states and 2036 transitions. [2022-11-20 18:54:42,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 18:54:42,653 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:42,653 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:42,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:42,867 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:42,868 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:42,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:42,868 INFO L85 PathProgramCache]: Analyzing trace with hash -740587320, now seen corresponding path program 1 times [2022-11-20 18:54:42,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:42,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [539851279] [2022-11-20 18:54:42,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:42,869 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:42,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:42,870 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:42,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2022-11-20 18:54:43,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:43,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 18:54:43,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:43,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:43,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:43,366 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:43,366 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:43,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [539851279] [2022-11-20 18:54:43,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [539851279] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:43,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [262205469] [2022-11-20 18:54:43,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:43,367 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:43,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:43,368 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:43,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2022-11-20 18:54:43,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:43,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:54:43,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:43,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:43,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:43,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:43,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [262205469] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:43,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [960134306] [2022-11-20 18:54:43,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:43,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:54:43,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:54:43,846 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:54:43,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-20 18:54:44,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:44,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:54:44,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:44,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:44,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:44,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:44,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [960134306] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:44,199 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:54:44,199 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5, 5, 5, 5] total 12 [2022-11-20 18:54:44,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432244313] [2022-11-20 18:54:44,199 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:54:44,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-20 18:54:44,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:44,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-20 18:54:44,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-20 18:54:44,201 INFO L87 Difference]: Start difference. First operand 588 states and 2036 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:45,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:45,001 INFO L93 Difference]: Finished difference Result 632 states and 2053 transitions. [2022-11-20 18:54:45,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 18:54:45,002 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 18:54:45,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:45,003 INFO L225 Difference]: With dead ends: 632 [2022-11-20 18:54:45,003 INFO L226 Difference]: Without dead ends: 632 [2022-11-20 18:54:45,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-11-20 18:54:45,004 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 85 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 115 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:45,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 21 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 201 Invalid, 0 Unknown, 115 Unchecked, 0.7s Time] [2022-11-20 18:54:45,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2022-11-20 18:54:45,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 595. [2022-11-20 18:54:45,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 595 states, 575 states have (on average 3.457391304347826) internal successors, (1988), 594 states have internal predecessors, (1988), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:45,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 595 states to 595 states and 1988 transitions. [2022-11-20 18:54:45,023 INFO L78 Accepts]: Start accepts. Automaton has 595 states and 1988 transitions. Word has length 9 [2022-11-20 18:54:45,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:45,023 INFO L495 AbstractCegarLoop]: Abstraction has 595 states and 1988 transitions. [2022-11-20 18:54:45,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:45,024 INFO L276 IsEmpty]: Start isEmpty. Operand 595 states and 1988 transitions. [2022-11-20 18:54:45,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 18:54:45,024 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:45,024 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:45,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:45,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:45,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:45,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:54:45,630 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:45,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:45,630 INFO L85 PathProgramCache]: Analyzing trace with hash -740587692, now seen corresponding path program 1 times [2022-11-20 18:54:45,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:45,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [453331853] [2022-11-20 18:54:45,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:45,630 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:45,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:45,631 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:45,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2022-11-20 18:54:45,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:45,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:54:45,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:45,965 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:45,965 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:46,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:46,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:46,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:46,602 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:46,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [453331853] [2022-11-20 18:54:46,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [453331853] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:46,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1819286510] [2022-11-20 18:54:46,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:46,603 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:46,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:46,604 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:46,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2022-11-20 18:54:46,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:46,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 18:54:46,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:46,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:47,074 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 18:54:47,074 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 18:54:47,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:54:47,229 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:47,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1819286510] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:47,229 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 18:54:47,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 18:54:47,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302237283] [2022-11-20 18:54:47,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:47,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:47,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:47,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:47,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:47,231 INFO L87 Difference]: Start difference. First operand 595 states and 1988 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:47,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:47,337 INFO L93 Difference]: Finished difference Result 595 states and 1988 transitions. [2022-11-20 18:54:47,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:47,338 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 18:54:47,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:47,339 INFO L225 Difference]: With dead ends: 595 [2022-11-20 18:54:47,340 INFO L226 Difference]: Without dead ends: 595 [2022-11-20 18:54:47,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 18:54:47,341 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:47,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 6 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 28 Unchecked, 0.1s Time] [2022-11-20 18:54:47,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 595 states. [2022-11-20 18:54:47,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 595 to 595. [2022-11-20 18:54:47,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 595 states, 575 states have (on average 3.457391304347826) internal successors, (1988), 594 states have internal predecessors, (1988), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:47,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 595 states to 595 states and 1988 transitions. [2022-11-20 18:54:47,362 INFO L78 Accepts]: Start accepts. Automaton has 595 states and 1988 transitions. Word has length 9 [2022-11-20 18:54:47,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:47,362 INFO L495 AbstractCegarLoop]: Abstraction has 595 states and 1988 transitions. [2022-11-20 18:54:47,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:47,362 INFO L276 IsEmpty]: Start isEmpty. Operand 595 states and 1988 transitions. [2022-11-20 18:54:47,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 18:54:47,363 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:47,363 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:47,366 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (49)] Ended with exit code 0 [2022-11-20 18:54:47,573 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (48)] Ended with exit code 0 [2022-11-20 18:54:47,763 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:47,764 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:47,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:47,764 INFO L85 PathProgramCache]: Analyzing trace with hash 2084266312, now seen corresponding path program 2 times [2022-11-20 18:54:47,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:47,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1309919117] [2022-11-20 18:54:47,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:54:47,765 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:47,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:47,766 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:47,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2022-11-20 18:54:47,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 18:54:47,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:54:47,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:54:47,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:47,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:47,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:47,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:54:48,076 INFO L321 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2022-11-20 18:54:48,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 32 [2022-11-20 18:54:48,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2022-11-20 18:54:48,154 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 18:54:48,154 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:54:48,154 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:48,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1309919117] [2022-11-20 18:54:48,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1309919117] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:54:48,154 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:54:48,155 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 18:54:48,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29646435] [2022-11-20 18:54:48,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:54:48,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 18:54:48,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:48,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 18:54:48,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:48,156 INFO L87 Difference]: Start difference. First operand 595 states and 1988 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:48,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:48,331 INFO L93 Difference]: Finished difference Result 562 states and 1889 transitions. [2022-11-20 18:54:48,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 18:54:48,332 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 18:54:48,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:48,333 INFO L225 Difference]: With dead ends: 562 [2022-11-20 18:54:48,333 INFO L226 Difference]: Without dead ends: 562 [2022-11-20 18:54:48,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 18:54:48,334 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:48,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 3 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 18:54:48,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2022-11-20 18:54:48,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 556. [2022-11-20 18:54:48,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 556 states, 542 states have (on average 3.4317343173431736) internal successors, (1860), 555 states have internal predecessors, (1860), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:48,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 556 states to 556 states and 1860 transitions. [2022-11-20 18:54:48,353 INFO L78 Accepts]: Start accepts. Automaton has 556 states and 1860 transitions. Word has length 10 [2022-11-20 18:54:48,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:48,354 INFO L495 AbstractCegarLoop]: Abstraction has 556 states and 1860 transitions. [2022-11-20 18:54:48,354 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:48,354 INFO L276 IsEmpty]: Start isEmpty. Operand 556 states and 1860 transitions. [2022-11-20 18:54:48,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 18:54:48,355 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:48,355 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:48,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:48,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:48,570 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:48,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:48,570 INFO L85 PathProgramCache]: Analyzing trace with hash 2084266238, now seen corresponding path program 1 times [2022-11-20 18:54:48,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:48,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [287052935] [2022-11-20 18:54:48,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:48,571 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:48,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:48,572 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:48,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2022-11-20 18:54:48,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:48,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:54:48,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:48,919 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:48,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:49,322 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 18:54:49,591 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:49,591 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:54:49,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [287052935] [2022-11-20 18:54:49,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [287052935] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:49,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1471824100] [2022-11-20 18:54:49,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:49,592 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:54:49,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:54:49,593 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:54:49,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2022-11-20 18:54:49,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:49,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:54:49,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:50,352 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:50,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:51,187 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:51,187 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1471824100] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:51,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144925743] [2022-11-20 18:54:51,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:51,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:54:51,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:54:51,189 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:54:51,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-20 18:54:51,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:51,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:54:51,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:51,554 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:51,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:52,339 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:52,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:54:53,368 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:53,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144925743] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:54:53,368 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:54:53,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 18:54:53,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248009486] [2022-11-20 18:54:53,369 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:54:53,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 18:54:53,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:54:53,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 18:54:53,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 18:54:53,370 INFO L87 Difference]: Start difference. First operand 556 states and 1860 transitions. Second operand has 35 states, 34 states have (on average 1.588235294117647) internal successors, (54), 34 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:57,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:54:57,858 INFO L93 Difference]: Finished difference Result 695 states and 2387 transitions. [2022-11-20 18:54:57,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-20 18:54:57,859 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.588235294117647) internal successors, (54), 34 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 18:54:57,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:54:57,861 INFO L225 Difference]: With dead ends: 695 [2022-11-20 18:54:57,861 INFO L226 Difference]: Without dead ends: 695 [2022-11-20 18:54:57,862 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=328, Invalid=2122, Unknown=0, NotChecked=0, Total=2450 [2022-11-20 18:54:57,863 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 298 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 731 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 298 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 885 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 731 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-20 18:54:57,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [298 Valid, 120 Invalid, 885 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 731 Invalid, 0 Unknown, 147 Unchecked, 3.0s Time] [2022-11-20 18:54:57,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2022-11-20 18:54:57,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 661. [2022-11-20 18:54:57,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 647 states have (on average 3.599690880989181) internal successors, (2329), 660 states have internal predecessors, (2329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:57,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 2329 transitions. [2022-11-20 18:54:57,885 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 2329 transitions. Word has length 10 [2022-11-20 18:54:57,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:54:57,885 INFO L495 AbstractCegarLoop]: Abstraction has 661 states and 2329 transitions. [2022-11-20 18:54:57,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.588235294117647) internal successors, (54), 34 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:54:57,886 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 2329 transitions. [2022-11-20 18:54:57,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 18:54:57,887 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:54:57,887 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:54:57,895 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2022-11-20 18:54:58,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:58,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2022-11-20 18:54:58,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:58,496 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:54:58,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:54:58,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1477967732, now seen corresponding path program 1 times [2022-11-20 18:54:58,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:54:58,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [450130830] [2022-11-20 18:54:58,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:54:58,497 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:54:58,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:54:58,498 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:54:58,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2022-11-20 18:54:58,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:54:58,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 18:54:58,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:54:58,854 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:54:58,854 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:54:59,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:54:59,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:00,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:00,468 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:55:00,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [450130830] [2022-11-20 18:55:00,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [450130830] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:00,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1616973337] [2022-11-20 18:55:00,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:00,468 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:55:00,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:55:00,469 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:55:00,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2022-11-20 18:55:00,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:00,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:55:00,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:00,962 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:55:00,962 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:55:01,438 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:01,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:02,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:02,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1616973337] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:02,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1988765020] [2022-11-20 18:55:02,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:02,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:55:02,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:55:02,146 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:55:02,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-20 18:55:02,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:02,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:55:02,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:02,507 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:55:02,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:55:02,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:02,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:03,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:03,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1988765020] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:03,119 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:55:03,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 14 [2022-11-20 18:55:03,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851466039] [2022-11-20 18:55:03,119 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:55:03,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-20 18:55:03,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:55:03,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-20 18:55:03,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2022-11-20 18:55:03,121 INFO L87 Difference]: Start difference. First operand 661 states and 2329 transitions. Second operand has 16 states, 15 states have (on average 2.533333333333333) internal successors, (38), 15 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:06,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:55:06,299 INFO L93 Difference]: Finished difference Result 963 states and 3600 transitions. [2022-11-20 18:55:06,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-20 18:55:06,300 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.533333333333333) internal successors, (38), 15 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 18:55:06,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:55:06,303 INFO L225 Difference]: With dead ends: 963 [2022-11-20 18:55:06,303 INFO L226 Difference]: Without dead ends: 963 [2022-11-20 18:55:06,303 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=106, Invalid=314, Unknown=0, NotChecked=0, Total=420 [2022-11-20 18:55:06,304 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 168 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 229 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-20 18:55:06,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 40 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 211 Invalid, 0 Unknown, 229 Unchecked, 1.3s Time] [2022-11-20 18:55:06,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 963 states. [2022-11-20 18:55:06,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 963 to 887. [2022-11-20 18:55:06,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 887 states, 873 states have (on average 3.6884306987399773) internal successors, (3220), 886 states have internal predecessors, (3220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:06,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 887 states to 887 states and 3220 transitions. [2022-11-20 18:55:06,327 INFO L78 Accepts]: Start accepts. Automaton has 887 states and 3220 transitions. Word has length 10 [2022-11-20 18:55:06,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:55:06,327 INFO L495 AbstractCegarLoop]: Abstraction has 887 states and 3220 transitions. [2022-11-20 18:55:06,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.533333333333333) internal successors, (38), 15 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:06,328 INFO L276 IsEmpty]: Start isEmpty. Operand 887 states and 3220 transitions. [2022-11-20 18:55:06,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 18:55:06,340 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:55:06,340 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2022-11-20 18:55:06,349 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (54)] Ended with exit code 0 [2022-11-20 18:55:06,546 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2022-11-20 18:55:06,743 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (55)] Ended with exit code 0 [2022-11-20 18:55:06,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:55:06,941 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:55:06,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:55:06,941 INFO L85 PathProgramCache]: Analyzing trace with hash -982823684, now seen corresponding path program 2 times [2022-11-20 18:55:06,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:55:06,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1230103002] [2022-11-20 18:55:06,941 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:55:06,942 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:55:06,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:55:06,943 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:55:06,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2022-11-20 18:55:07,144 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:55:07,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:55:07,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 18:55:07,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:07,336 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:55:07,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:55:07,883 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:07,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:09,856 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:09,856 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:55:09,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1230103002] [2022-11-20 18:55:09,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1230103002] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:09,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [753302968] [2022-11-20 18:55:09,857 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:55:09,857 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:55:09,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:55:09,859 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:55:09,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2022-11-20 18:55:10,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:55:10,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:55:10,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:55:10,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:10,459 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:55:10,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:55:10,516 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 18:55:11,008 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:55:11,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:12,183 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:55:12,184 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [753302968] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:12,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855633216] [2022-11-20 18:55:12,184 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:55:12,184 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:55:12,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:55:12,185 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:55:12,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-20 18:55:12,401 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:55:12,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:55:12,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:55:12,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:12,783 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:55:12,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:55:13,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855633216] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:13,276 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:55:13,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 35 [2022-11-20 18:55:13,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669729462] [2022-11-20 18:55:13,276 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:55:13,277 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-20 18:55:13,277 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:55:13,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-20 18:55:13,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=978, Unknown=0, NotChecked=0, Total=1260 [2022-11-20 18:55:13,278 INFO L87 Difference]: Start difference. First operand 887 states and 3220 transitions. Second operand has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:39,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:55:39,148 INFO L93 Difference]: Finished difference Result 1822 states and 5971 transitions. [2022-11-20 18:55:39,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-20 18:55:39,150 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 18:55:39,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:55:39,153 INFO L225 Difference]: With dead ends: 1822 [2022-11-20 18:55:39,153 INFO L226 Difference]: Without dead ends: 1822 [2022-11-20 18:55:39,154 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 967 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=851, Invalid=2689, Unknown=0, NotChecked=0, Total=3540 [2022-11-20 18:55:39,155 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 1155 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 2175 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1155 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 2225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 2175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:55:39,155 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1155 Valid, 306 Invalid, 2225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 2175 Invalid, 0 Unknown, 0 Unchecked, 14.2s Time] [2022-11-20 18:55:39,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1822 states. [2022-11-20 18:55:39,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1822 to 1074. [2022-11-20 18:55:39,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1074 states, 1060 states have (on average 3.5066037735849056) internal successors, (3717), 1073 states have internal predecessors, (3717), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:39,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1074 states to 1074 states and 3717 transitions. [2022-11-20 18:55:39,192 INFO L78 Accepts]: Start accepts. Automaton has 1074 states and 3717 transitions. Word has length 11 [2022-11-20 18:55:39,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:55:39,192 INFO L495 AbstractCegarLoop]: Abstraction has 1074 states and 3717 transitions. [2022-11-20 18:55:39,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:39,192 INFO L276 IsEmpty]: Start isEmpty. Operand 1074 states and 3717 transitions. [2022-11-20 18:55:39,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 18:55:39,193 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:55:39,193 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:55:39,202 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (57)] Ended with exit code 0 [2022-11-20 18:55:39,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-11-20 18:55:39,597 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (58)] Ended with exit code 0 [2022-11-20 18:55:39,794 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:55:39,794 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:55:39,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:55:39,795 INFO L85 PathProgramCache]: Analyzing trace with hash -982945563, now seen corresponding path program 1 times [2022-11-20 18:55:39,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:55:39,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [773220819] [2022-11-20 18:55:39,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:39,795 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:55:39,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:55:39,796 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:55:39,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2022-11-20 18:55:39,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:39,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 18:55:39,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:40,119 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:40,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:40,423 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 18:55:40,651 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:40,651 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:55:40,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [773220819] [2022-11-20 18:55:40,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [773220819] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:40,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2118060755] [2022-11-20 18:55:40,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:40,652 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:55:40,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:55:40,659 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:55:40,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2022-11-20 18:55:40,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:40,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:55:40,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:41,140 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:55:41,140 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:55:41,639 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:41,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:42,529 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:42,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2118060755] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:42,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648735014] [2022-11-20 18:55:42,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:42,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:55:42,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:55:42,531 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:55:42,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-11-20 18:55:42,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:42,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-20 18:55:42,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:43,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:55:43,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:55:43,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:55:43,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 10 [2022-11-20 18:55:43,031 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-20 18:55:43,302 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 18:55:43,303 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:55:43,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648735014] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:55:43,303 INFO L184 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2022-11-20 18:55:43,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5, 5, 5] total 23 [2022-11-20 18:55:43,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493268493] [2022-11-20 18:55:43,303 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:55:43,304 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 18:55:43,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:55:43,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 18:55:43,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-11-20 18:55:43,305 INFO L87 Difference]: Start difference. First operand 1074 states and 3717 transitions. Second operand has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:44,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:55:44,387 INFO L93 Difference]: Finished difference Result 1660 states and 5692 transitions. [2022-11-20 18:55:44,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 18:55:44,388 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 18:55:44,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:55:44,392 INFO L225 Difference]: With dead ends: 1660 [2022-11-20 18:55:44,393 INFO L226 Difference]: Without dead ends: 1660 [2022-11-20 18:55:44,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=159, Invalid=771, Unknown=0, NotChecked=0, Total=930 [2022-11-20 18:55:44,394 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 103 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-20 18:55:44,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 28 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-20 18:55:44,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1660 states. [2022-11-20 18:55:44,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1660 to 1256. [2022-11-20 18:55:44,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1256 states, 1242 states have (on average 3.6457326892109503) internal successors, (4528), 1255 states have internal predecessors, (4528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:44,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1256 states to 1256 states and 4528 transitions. [2022-11-20 18:55:44,428 INFO L78 Accepts]: Start accepts. Automaton has 1256 states and 4528 transitions. Word has length 11 [2022-11-20 18:55:44,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:55:44,429 INFO L495 AbstractCegarLoop]: Abstraction has 1256 states and 4528 transitions. [2022-11-20 18:55:44,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:44,429 INFO L276 IsEmpty]: Start isEmpty. Operand 1256 states and 4528 transitions. [2022-11-20 18:55:44,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 18:55:44,430 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:55:44,431 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:55:44,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2022-11-20 18:55:44,648 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (61)] Ended with exit code 0 [2022-11-20 18:55:44,852 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2022-11-20 18:55:45,046 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:55:45,046 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:55:45,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:55:45,047 INFO L85 PathProgramCache]: Analyzing trace with hash -986602323, now seen corresponding path program 2 times [2022-11-20 18:55:45,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:55:45,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [110718107] [2022-11-20 18:55:45,047 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:55:45,047 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:55:45,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:55:45,048 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:55:45,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2022-11-20 18:55:45,215 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 18:55:45,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:55:45,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:55:45,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:45,400 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:55:45,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:55:45,635 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 18:55:45,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:55:45,636 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:55:45,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [110718107] [2022-11-20 18:55:45,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [110718107] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:55:45,636 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:55:45,636 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 18:55:45,636 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201510226] [2022-11-20 18:55:45,636 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:55:45,637 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 18:55:45,637 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:55:45,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 18:55:45,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-20 18:55:45,637 INFO L87 Difference]: Start difference. First operand 1256 states and 4528 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:45,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:55:45,828 INFO L93 Difference]: Finished difference Result 1262 states and 4555 transitions. [2022-11-20 18:55:45,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 18:55:45,829 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 18:55:45,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:55:45,832 INFO L225 Difference]: With dead ends: 1262 [2022-11-20 18:55:45,832 INFO L226 Difference]: Without dead ends: 1262 [2022-11-20 18:55:45,833 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-20 18:55:45,833 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:55:45,834 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 12 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 31 Unchecked, 0.1s Time] [2022-11-20 18:55:45,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1262 states. [2022-11-20 18:55:45,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1262 to 1261. [2022-11-20 18:55:45,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1261 states, 1247 states have (on average 3.6503608660785885) internal successors, (4552), 1260 states have internal predecessors, (4552), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:45,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1261 states to 1261 states and 4552 transitions. [2022-11-20 18:55:45,883 INFO L78 Accepts]: Start accepts. Automaton has 1261 states and 4552 transitions. Word has length 11 [2022-11-20 18:55:45,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:55:45,884 INFO L495 AbstractCegarLoop]: Abstraction has 1261 states and 4552 transitions. [2022-11-20 18:55:45,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:45,885 INFO L276 IsEmpty]: Start isEmpty. Operand 1261 states and 4552 transitions. [2022-11-20 18:55:45,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 18:55:45,886 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:55:45,886 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:55:45,902 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2022-11-20 18:55:46,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:55:46,099 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:55:46,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:55:46,099 INFO L85 PathProgramCache]: Analyzing trace with hash 193122172, now seen corresponding path program 1 times [2022-11-20 18:55:46,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:55:46,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [879317772] [2022-11-20 18:55:46,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:46,100 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:55:46,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:55:46,101 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:55:46,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2022-11-20 18:55:46,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:46,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:55:46,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:46,477 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:46,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:46,937 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 18:55:47,207 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:47,208 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:55:47,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [879317772] [2022-11-20 18:55:47,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [879317772] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:47,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1087042631] [2022-11-20 18:55:47,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:47,209 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:55:47,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:55:47,210 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:55:47,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2022-11-20 18:55:47,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:47,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:55:47,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:47,992 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:47,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:48,887 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:48,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1087042631] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:48,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717404128] [2022-11-20 18:55:48,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:48,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:55:48,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:55:48,889 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:55:48,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-11-20 18:55:49,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:49,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:55:49,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:49,287 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:55:49,287 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:55:50,398 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:50,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:51,522 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:51,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717404128] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:51,522 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:55:51,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 18:55:51,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214824415] [2022-11-20 18:55:51,523 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:55:51,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 18:55:51,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:55:51,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 18:55:51,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 18:55:51,524 INFO L87 Difference]: Start difference. First operand 1261 states and 4552 transitions. Second operand has 35 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 34 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:56,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:55:56,373 INFO L93 Difference]: Finished difference Result 1329 states and 4745 transitions. [2022-11-20 18:55:56,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-20 18:55:56,374 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 34 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 18:55:56,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:55:56,377 INFO L225 Difference]: With dead ends: 1329 [2022-11-20 18:55:56,378 INFO L226 Difference]: Without dead ends: 1329 [2022-11-20 18:55:56,379 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=328, Invalid=2122, Unknown=0, NotChecked=0, Total=2450 [2022-11-20 18:55:56,379 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 210 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 920 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 1072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 920 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:55:56,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 146 Invalid, 1072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 920 Invalid, 0 Unknown, 145 Unchecked, 3.2s Time] [2022-11-20 18:55:56,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1329 states. [2022-11-20 18:55:56,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1329 to 1269. [2022-11-20 18:55:56,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1269 states, 1255 states have (on average 3.652589641434263) internal successors, (4584), 1268 states have internal predecessors, (4584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:56,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1269 states to 1269 states and 4584 transitions. [2022-11-20 18:55:56,403 INFO L78 Accepts]: Start accepts. Automaton has 1269 states and 4584 transitions. Word has length 11 [2022-11-20 18:55:56,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:55:56,403 INFO L495 AbstractCegarLoop]: Abstraction has 1269 states and 4584 transitions. [2022-11-20 18:55:56,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 34 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:55:56,403 INFO L276 IsEmpty]: Start isEmpty. Operand 1269 states and 4584 transitions. [2022-11-20 18:55:56,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 18:55:56,404 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:55:56,404 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:55:56,412 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2022-11-20 18:55:56,608 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (65)] Ended with exit code 0 [2022-11-20 18:55:56,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2022-11-20 18:55:57,005 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:55:57,006 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:55:57,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:55:57,006 INFO L85 PathProgramCache]: Analyzing trace with hash 193117863, now seen corresponding path program 1 times [2022-11-20 18:55:57,006 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:55:57,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1869536569] [2022-11-20 18:55:57,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:57,007 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:55:57,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:55:57,008 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:55:57,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2022-11-20 18:55:57,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:57,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 18:55:57,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:57,403 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:57,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:57,746 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 18:55:57,986 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:57,986 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:55:57,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1869536569] [2022-11-20 18:55:57,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1869536569] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:57,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [376575265] [2022-11-20 18:55:57,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:57,986 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:55:57,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:55:57,988 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:55:57,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2022-11-20 18:55:58,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:55:58,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:55:58,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:55:58,487 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:55:58,488 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:55:59,023 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:59,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:55:59,847 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:55:59,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [376575265] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:55:59,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289375244] [2022-11-20 18:55:59,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:55:59,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:55:59,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:55:59,849 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:55:59,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-11-20 18:56:00,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:56:00,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 18:56:00,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:00,131 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:00,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:00,252 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 18:56:00,277 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:00,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289375244] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:00,277 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:56:00,277 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 18 [2022-11-20 18:56:00,278 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874356844] [2022-11-20 18:56:00,278 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:56:00,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-20 18:56:00,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:56:00,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-20 18:56:00,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-11-20 18:56:00,279 INFO L87 Difference]: Start difference. First operand 1269 states and 4584 transitions. Second operand has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:03,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:56:03,197 INFO L93 Difference]: Finished difference Result 1337 states and 4793 transitions. [2022-11-20 18:56:03,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 18:56:03,198 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 18:56:03,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:56:03,201 INFO L225 Difference]: With dead ends: 1337 [2022-11-20 18:56:03,201 INFO L226 Difference]: Without dead ends: 1337 [2022-11-20 18:56:03,201 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=196, Invalid=674, Unknown=0, NotChecked=0, Total=870 [2022-11-20 18:56:03,202 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 184 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-20 18:56:03,202 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 74 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 427 Invalid, 0 Unknown, 17 Unchecked, 1.9s Time] [2022-11-20 18:56:03,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1337 states. [2022-11-20 18:56:03,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1337 to 1285. [2022-11-20 18:56:03,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1285 states, 1271 states have (on average 3.6742722265932337) internal successors, (4670), 1284 states have internal predecessors, (4670), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:03,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1285 states to 1285 states and 4670 transitions. [2022-11-20 18:56:03,226 INFO L78 Accepts]: Start accepts. Automaton has 1285 states and 4670 transitions. Word has length 11 [2022-11-20 18:56:03,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:56:03,226 INFO L495 AbstractCegarLoop]: Abstraction has 1285 states and 4670 transitions. [2022-11-20 18:56:03,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:03,226 INFO L276 IsEmpty]: Start isEmpty. Operand 1285 states and 4670 transitions. [2022-11-20 18:56:03,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 18:56:03,227 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:56:03,227 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:56:03,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (68)] Forceful destruction successful, exit code 0 [2022-11-20 18:56:03,438 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (67)] Ended with exit code 0 [2022-11-20 18:56:03,636 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2022-11-20 18:56:03,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:56:03,830 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:56:03,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:56:03,831 INFO L85 PathProgramCache]: Analyzing trace with hash 193148553, now seen corresponding path program 2 times [2022-11-20 18:56:03,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:56:03,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1438834981] [2022-11-20 18:56:03,831 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:56:03,831 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:56:03,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:56:03,833 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:56:03,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2022-11-20 18:56:04,048 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 18:56:04,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:04,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:56:04,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:04,239 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:56:04,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:56:04,472 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 18:56:04,472 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:56:04,472 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:56:04,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1438834981] [2022-11-20 18:56:04,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1438834981] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:56:04,473 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:56:04,473 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 18:56:04,473 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699309872] [2022-11-20 18:56:04,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:56:04,473 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 18:56:04,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:56:04,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 18:56:04,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-20 18:56:04,474 INFO L87 Difference]: Start difference. First operand 1285 states and 4670 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:04,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:56:04,626 INFO L93 Difference]: Finished difference Result 1315 states and 4834 transitions. [2022-11-20 18:56:04,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 18:56:04,627 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 18:56:04,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:56:04,630 INFO L225 Difference]: With dead ends: 1315 [2022-11-20 18:56:04,630 INFO L226 Difference]: Without dead ends: 1315 [2022-11-20 18:56:04,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-20 18:56:04,631 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 7 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:56:04,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 15 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 29 Unchecked, 0.1s Time] [2022-11-20 18:56:04,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2022-11-20 18:56:04,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1293. [2022-11-20 18:56:04,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1293 states, 1279 states have (on average 3.6888193901485535) internal successors, (4718), 1292 states have internal predecessors, (4718), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:04,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1293 states to 1293 states and 4718 transitions. [2022-11-20 18:56:04,655 INFO L78 Accepts]: Start accepts. Automaton has 1293 states and 4718 transitions. Word has length 11 [2022-11-20 18:56:04,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:56:04,655 INFO L495 AbstractCegarLoop]: Abstraction has 1293 states and 4718 transitions. [2022-11-20 18:56:04,655 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:04,655 INFO L276 IsEmpty]: Start isEmpty. Operand 1293 states and 4718 transitions. [2022-11-20 18:56:04,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 18:56:04,656 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:56:04,656 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:56:04,671 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (70)] Ended with exit code 0 [2022-11-20 18:56:04,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:56:04,856 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:56:04,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:56:04,857 INFO L85 PathProgramCache]: Analyzing trace with hash 187759792, now seen corresponding path program 2 times [2022-11-20 18:56:04,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:56:04,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1128195109] [2022-11-20 18:56:04,857 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:56:04,857 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:56:04,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:56:04,858 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:56:04,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2022-11-20 18:56:05,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:56:05,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:05,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:56:05,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:05,242 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 18:56:05,243 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 18:56:05,455 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:05,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:06,286 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:06,286 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:56:06,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1128195109] [2022-11-20 18:56:06,286 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1128195109] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:06,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [807073108] [2022-11-20 18:56:06,287 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:56:06,287 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:56:06,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:56:06,288 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:56:06,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2022-11-20 18:56:06,761 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:56:06,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:06,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 18:56:06,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:06,945 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:56:06,945 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:56:07,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 18:56:07,662 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:07,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:08,551 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:08,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [807073108] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:08,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173082155] [2022-11-20 18:56:08,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:56:08,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:56:08,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:56:08,553 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:56:08,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2022-11-20 18:56:08,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:56:08,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:08,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:56:08,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:09,022 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:56:09,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:56:09,883 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:09,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:10,937 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:10,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173082155] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:10,938 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:56:10,938 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 18:56:10,938 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262652727] [2022-11-20 18:56:10,938 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:56:10,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 18:56:10,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:56:10,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 18:56:10,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 18:56:10,940 INFO L87 Difference]: Start difference. First operand 1293 states and 4718 transitions. Second operand has 35 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 34 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:15,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:56:15,669 INFO L93 Difference]: Finished difference Result 1823 states and 6433 transitions. [2022-11-20 18:56:15,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-20 18:56:15,670 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 34 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 18:56:15,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:56:15,675 INFO L225 Difference]: With dead ends: 1823 [2022-11-20 18:56:15,675 INFO L226 Difference]: Without dead ends: 1823 [2022-11-20 18:56:15,675 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=280, Invalid=1790, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 18:56:15,676 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 323 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 754 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 1249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 487 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-20 18:56:15,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [323 Valid, 201 Invalid, 1249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 754 Invalid, 0 Unknown, 487 Unchecked, 3.4s Time] [2022-11-20 18:56:15,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1823 states. [2022-11-20 18:56:15,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1823 to 1442. [2022-11-20 18:56:15,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1442 states, 1428 states have (on average 3.7556022408963585) internal successors, (5363), 1441 states have internal predecessors, (5363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:15,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1442 states to 1442 states and 5363 transitions. [2022-11-20 18:56:15,705 INFO L78 Accepts]: Start accepts. Automaton has 1442 states and 5363 transitions. Word has length 11 [2022-11-20 18:56:15,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:56:15,705 INFO L495 AbstractCegarLoop]: Abstraction has 1442 states and 5363 transitions. [2022-11-20 18:56:15,705 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 34 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:15,706 INFO L276 IsEmpty]: Start isEmpty. Operand 1442 states and 5363 transitions. [2022-11-20 18:56:15,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 18:56:15,707 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:56:15,707 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:56:15,717 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (71)] Ended with exit code 0 [2022-11-20 18:56:15,911 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (72)] Ended with exit code 0 [2022-11-20 18:56:16,114 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2022-11-20 18:56:16,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:56:16,308 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:56:16,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:56:16,308 INFO L85 PathProgramCache]: Analyzing trace with hash 187746772, now seen corresponding path program 3 times [2022-11-20 18:56:16,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:56:16,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1691529634] [2022-11-20 18:56:16,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:56:16,309 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:56:16,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:56:16,309 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:56:16,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2022-11-20 18:56:16,556 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 18:56:16,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:16,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:56:16,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:16,732 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 18:56:16,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 18:56:16,924 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:16,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:17,682 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:17,682 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:56:17,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1691529634] [2022-11-20 18:56:17,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1691529634] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:17,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [985259620] [2022-11-20 18:56:17,683 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:56:17,683 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:56:17,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:56:17,684 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:56:17,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2022-11-20 18:56:18,130 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 18:56:18,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:18,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 18:56:18,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:18,309 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:56:18,309 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:56:18,480 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-20 18:56:18,994 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:18,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:19,863 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:19,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [985259620] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:19,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1887478517] [2022-11-20 18:56:19,863 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:56:19,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:56:19,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:56:19,865 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:56:19,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2022-11-20 18:56:20,112 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 18:56:20,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:20,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:56:20,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:20,286 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:56:20,287 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:56:21,086 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:21,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:22,036 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:22,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1887478517] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:22,037 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:56:22,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 18:56:22,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442773559] [2022-11-20 18:56:22,037 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:56:22,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 18:56:22,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:56:22,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 18:56:22,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 18:56:22,039 INFO L87 Difference]: Start difference. First operand 1442 states and 5363 transitions. Second operand has 35 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 34 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:27,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:56:27,198 INFO L93 Difference]: Finished difference Result 1675 states and 6158 transitions. [2022-11-20 18:56:27,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-20 18:56:27,199 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 34 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 18:56:27,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:56:27,204 INFO L225 Difference]: With dead ends: 1675 [2022-11-20 18:56:27,204 INFO L226 Difference]: Without dead ends: 1675 [2022-11-20 18:56:27,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=283, Invalid=1787, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 18:56:27,205 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 227 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 1253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 452 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-11-20 18:56:27,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 151 Invalid, 1253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 796 Invalid, 0 Unknown, 452 Unchecked, 3.7s Time] [2022-11-20 18:56:27,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1675 states. [2022-11-20 18:56:27,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1675 to 1498. [2022-11-20 18:56:27,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1498 states, 1484 states have (on average 3.784366576819407) internal successors, (5616), 1497 states have internal predecessors, (5616), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:27,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1498 states to 1498 states and 5616 transitions. [2022-11-20 18:56:27,251 INFO L78 Accepts]: Start accepts. Automaton has 1498 states and 5616 transitions. Word has length 11 [2022-11-20 18:56:27,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:56:27,251 INFO L495 AbstractCegarLoop]: Abstraction has 1498 states and 5616 transitions. [2022-11-20 18:56:27,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.7352941176470589) internal successors, (59), 34 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:56:27,251 INFO L276 IsEmpty]: Start isEmpty. Operand 1498 states and 5616 transitions. [2022-11-20 18:56:27,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:56:27,252 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:56:27,253 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1] [2022-11-20 18:56:27,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (74)] Forceful destruction successful, exit code 0 [2022-11-20 18:56:27,460 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2022-11-20 18:56:27,658 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (75)] Ended with exit code 0 [2022-11-20 18:56:27,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:56:27,854 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:56:27,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:56:27,854 INFO L85 PathProgramCache]: Analyzing trace with hash 417008356, now seen corresponding path program 3 times [2022-11-20 18:56:27,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:56:27,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [424837209] [2022-11-20 18:56:27,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:56:27,855 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:56:27,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:56:27,856 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:56:27,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2022-11-20 18:56:28,212 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 18:56:28,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:28,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 18:56:28,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:28,391 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:56:28,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:56:29,105 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:29,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:33,206 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:33,206 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:56:33,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [424837209] [2022-11-20 18:56:33,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [424837209] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:33,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1380680091] [2022-11-20 18:56:33,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:56:33,207 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:56:33,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:56:33,208 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:56:33,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2022-11-20 18:56:34,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 18:56:34,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:34,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 18:56:34,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:34,584 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:56:34,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:56:34,984 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:34,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:40,329 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:40,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1380680091] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:40,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888493583] [2022-11-20 18:56:40,329 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:56:40,329 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:56:40,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:56:40,330 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:56:40,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2022-11-20 18:56:43,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 18:56:43,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:56:43,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 18:56:43,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:56:43,487 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:56:43,487 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:56:43,774 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:43,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:56:48,911 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:56:48,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888493583] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:56:48,911 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:56:48,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11, 11] total 42 [2022-11-20 18:56:48,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842245305] [2022-11-20 18:56:48,912 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:56:48,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-20 18:56:48,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:56:48,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-20 18:56:48,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=1386, Unknown=0, NotChecked=0, Total=1892 [2022-11-20 18:56:48,914 INFO L87 Difference]: Start difference. First operand 1498 states and 5616 transitions. Second operand has 44 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 43 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:57:22,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:57:22,429 INFO L93 Difference]: Finished difference Result 11612 states and 44500 transitions. [2022-11-20 18:57:22,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-20 18:57:22,431 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 43 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:57:22,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:57:22,475 INFO L225 Difference]: With dead ends: 11612 [2022-11-20 18:57:22,475 INFO L226 Difference]: Without dead ends: 11612 [2022-11-20 18:57:22,476 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 30.8s TimeCoverageRelationStatistics Valid=857, Invalid=2005, Unknown=0, NotChecked=0, Total=2862 [2022-11-20 18:57:22,476 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 5297 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 3569 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5297 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 3611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 3569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.0s IncrementalHoareTripleChecker+Time [2022-11-20 18:57:22,477 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5297 Valid, 432 Invalid, 3611 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 3569 Invalid, 0 Unknown, 0 Unchecked, 16.0s Time] [2022-11-20 18:57:22,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11612 states. [2022-11-20 18:57:22,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11612 to 1510. [2022-11-20 18:57:22,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1510 states, 1496 states have (on average 3.770053475935829) internal successors, (5640), 1509 states have internal predecessors, (5640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:57:22,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1510 states to 1510 states and 5640 transitions. [2022-11-20 18:57:22,630 INFO L78 Accepts]: Start accepts. Automaton has 1510 states and 5640 transitions. Word has length 12 [2022-11-20 18:57:22,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:57:22,630 INFO L495 AbstractCegarLoop]: Abstraction has 1510 states and 5640 transitions. [2022-11-20 18:57:22,630 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 43 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:57:22,630 INFO L276 IsEmpty]: Start isEmpty. Operand 1510 states and 5640 transitions. [2022-11-20 18:57:22,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:57:22,631 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:57:22,632 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:57:22,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (78)] Forceful destruction successful, exit code 0 [2022-11-20 18:57:22,842 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Ended with exit code 0 [2022-11-20 18:57:23,041 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (77)] Ended with exit code 0 [2022-11-20 18:57:23,232 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:57:23,233 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:57:23,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:57:23,233 INFO L85 PathProgramCache]: Analyzing trace with hash 458158220, now seen corresponding path program 2 times [2022-11-20 18:57:23,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:57:23,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1278402800] [2022-11-20 18:57:23,233 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:57:23,234 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:57:23,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:57:23,234 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:57:23,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2022-11-20 18:57:23,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 18:57:23,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:57:23,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 18:57:23,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:57:23,662 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:57:23,662 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:57:23,978 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 18:57:23,979 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:57:23,979 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:57:23,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1278402800] [2022-11-20 18:57:23,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1278402800] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:57:23,979 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:57:23,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 18:57:23,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021918900] [2022-11-20 18:57:23,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:57:23,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 18:57:23,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:57:23,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 18:57:23,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 18:57:23,981 INFO L87 Difference]: Start difference. First operand 1510 states and 5640 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:57:24,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:57:24,491 INFO L93 Difference]: Finished difference Result 1683 states and 6260 transitions. [2022-11-20 18:57:24,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 18:57:24,493 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:57:24,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:57:24,497 INFO L225 Difference]: With dead ends: 1683 [2022-11-20 18:57:24,497 INFO L226 Difference]: Without dead ends: 1683 [2022-11-20 18:57:24,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-20 18:57:24,498 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 65 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 18:57:24,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 6 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 18:57:24,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1683 states. [2022-11-20 18:57:24,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1683 to 1572. [2022-11-20 18:57:24,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1572 states, 1558 states have (on average 3.772785622593068) internal successors, (5878), 1571 states have internal predecessors, (5878), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:57:24,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1572 states to 1572 states and 5878 transitions. [2022-11-20 18:57:24,579 INFO L78 Accepts]: Start accepts. Automaton has 1572 states and 5878 transitions. Word has length 12 [2022-11-20 18:57:24,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:57:24,580 INFO L495 AbstractCegarLoop]: Abstraction has 1572 states and 5878 transitions. [2022-11-20 18:57:24,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:57:24,580 INFO L276 IsEmpty]: Start isEmpty. Operand 1572 states and 5878 transitions. [2022-11-20 18:57:24,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:57:24,590 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:57:24,590 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:57:24,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (80)] Forceful destruction successful, exit code 0 [2022-11-20 18:57:24,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:57:24,803 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:57:24,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:57:24,803 INFO L85 PathProgramCache]: Analyzing trace with hash 452755618, now seen corresponding path program 2 times [2022-11-20 18:57:24,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:57:24,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1244325733] [2022-11-20 18:57:24,804 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:57:24,804 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:57:24,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:57:24,806 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:57:24,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2022-11-20 18:57:25,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:57:25,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:57:25,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:57:25,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:57:25,242 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 18:57:25,242 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 18:57:25,571 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:57:25,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:57:26,922 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:57:26,922 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:57:26,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1244325733] [2022-11-20 18:57:26,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1244325733] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:57:26,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [346376969] [2022-11-20 18:57:26,923 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:57:26,923 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:57:26,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:57:26,924 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:57:26,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2022-11-20 18:57:27,419 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:57:27,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:57:27,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:57:27,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:57:28,386 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:57:28,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:57:29,776 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:57:29,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [346376969] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:57:29,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204308903] [2022-11-20 18:57:29,777 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:57:29,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:57:29,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:57:29,778 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:57:29,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2022-11-20 18:57:30,074 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:57:30,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:57:30,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-20 18:57:30,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:57:30,252 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:57:30,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:57:31,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-20 18:57:31,718 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:57:31,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:57:31,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-20 18:57:31,815 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 9 [2022-11-20 18:57:31,834 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-20 18:57:36,188 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:57:36,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204308903] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:57:36,189 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:57:36,189 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9, 8, 8, 8] total 48 [2022-11-20 18:57:36,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671352553] [2022-11-20 18:57:36,189 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:57:36,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-20 18:57:36,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:57:36,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-20 18:57:36,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=2225, Unknown=0, NotChecked=0, Total=2450 [2022-11-20 18:57:36,191 INFO L87 Difference]: Start difference. First operand 1572 states and 5878 transitions. Second operand has 50 states, 49 states have (on average 1.4489795918367347) internal successors, (71), 49 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) [2022-11-20 18:58:04,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:58:04,046 INFO L93 Difference]: Finished difference Result 3362 states and 12122 transitions. [2022-11-20 18:58:04,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-20 18:58:04,048 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.4489795918367347) internal successors, (71), 49 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) Word has length 12 [2022-11-20 18:58:04,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:58:04,057 INFO L225 Difference]: With dead ends: 3362 [2022-11-20 18:58:04,057 INFO L226 Difference]: Without dead ends: 3362 [2022-11-20 18:58:04,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1324 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=580, Invalid=4822, Unknown=0, NotChecked=0, Total=5402 [2022-11-20 18:58:04,058 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 534 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 2667 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 534 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 3518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 2667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 826 IncrementalHoareTripleChecker+Unchecked, 17.8s IncrementalHoareTripleChecker+Time [2022-11-20 18:58:04,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [534 Valid, 308 Invalid, 3518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 2667 Invalid, 0 Unknown, 826 Unchecked, 17.8s Time] [2022-11-20 18:58:04,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3362 states. [2022-11-20 18:58:04,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3362 to 2285. [2022-11-20 18:58:04,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2285 states, 2271 states have (on average 4.063848524878908) internal successors, (9229), 2284 states have internal predecessors, (9229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:04,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2285 states to 2285 states and 9229 transitions. [2022-11-20 18:58:04,116 INFO L78 Accepts]: Start accepts. Automaton has 2285 states and 9229 transitions. Word has length 12 [2022-11-20 18:58:04,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:58:04,116 INFO L495 AbstractCegarLoop]: Abstraction has 2285 states and 9229 transitions. [2022-11-20 18:58:04,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.4489795918367347) internal successors, (71), 49 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) [2022-11-20 18:58:04,116 INFO L276 IsEmpty]: Start isEmpty. Operand 2285 states and 9229 transitions. [2022-11-20 18:58:04,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:58:04,117 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:58:04,117 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:58:04,126 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Ended with exit code 0 [2022-11-20 18:58:04,328 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (81)] Ended with exit code 0 [2022-11-20 18:58:04,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (82)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:04,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:58:04,718 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:58:04,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:58:04,719 INFO L85 PathProgramCache]: Analyzing trace with hash -406538981, now seen corresponding path program 1 times [2022-11-20 18:58:04,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:58:04,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [100399956] [2022-11-20 18:58:04,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:04,719 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:04,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:58:04,721 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:58:04,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (84)] Waiting until timeout for monitored process [2022-11-20 18:58:05,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:05,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:58:05,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:05,225 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:05,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:05,725 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 18:58:06,016 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:06,016 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:58:06,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [100399956] [2022-11-20 18:58:06,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [100399956] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:06,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1011469645] [2022-11-20 18:58:06,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:06,017 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:58:06,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:58:06,018 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:58:06,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (85)] Waiting until timeout for monitored process [2022-11-20 18:58:06,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:06,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:58:06,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:06,998 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:06,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:07,963 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:07,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1011469645] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:07,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905110686] [2022-11-20 18:58:07,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:07,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:58:07,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:58:07,966 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:58:07,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2022-11-20 18:58:08,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:08,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:58:08,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:08,423 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:58:08,423 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:58:09,325 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:09,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:10,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:10,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905110686] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:10,431 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:58:10,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 18:58:10,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707692255] [2022-11-20 18:58:10,432 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:58:10,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 18:58:10,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:58:10,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 18:58:10,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 18:58:10,433 INFO L87 Difference]: Start difference. First operand 2285 states and 9229 transitions. Second operand has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:16,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:58:16,363 INFO L93 Difference]: Finished difference Result 2667 states and 10229 transitions. [2022-11-20 18:58:16,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-20 18:58:16,364 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:58:16,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:58:16,371 INFO L225 Difference]: With dead ends: 2667 [2022-11-20 18:58:16,372 INFO L226 Difference]: Without dead ends: 2667 [2022-11-20 18:58:16,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=382, Invalid=2480, Unknown=0, NotChecked=0, Total=2862 [2022-11-20 18:58:16,373 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 418 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 831 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 1087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 245 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-11-20 18:58:16,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [418 Valid, 126 Invalid, 1087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 831 Invalid, 0 Unknown, 245 Unchecked, 3.7s Time] [2022-11-20 18:58:16,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2667 states. [2022-11-20 18:58:16,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2667 to 2292. [2022-11-20 18:58:16,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2292 states, 2278 states have (on average 4.061457418788411) internal successors, (9252), 2291 states have internal predecessors, (9252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:16,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2292 states to 2292 states and 9252 transitions. [2022-11-20 18:58:16,459 INFO L78 Accepts]: Start accepts. Automaton has 2292 states and 9252 transitions. Word has length 12 [2022-11-20 18:58:16,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:58:16,460 INFO L495 AbstractCegarLoop]: Abstraction has 2292 states and 9252 transitions. [2022-11-20 18:58:16,460 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:16,460 INFO L276 IsEmpty]: Start isEmpty. Operand 2292 states and 9252 transitions. [2022-11-20 18:58:16,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:58:16,462 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:58:16,462 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:58:16,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (85)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:16,674 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2022-11-20 18:58:16,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (84)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:17,068 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:17,068 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:58:17,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:58:17,069 INFO L85 PathProgramCache]: Analyzing trace with hash -514531077, now seen corresponding path program 1 times [2022-11-20 18:58:17,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:58:17,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1894896940] [2022-11-20 18:58:17,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:17,069 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:17,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:58:17,070 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:58:17,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2022-11-20 18:58:17,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:17,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 18:58:17,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:17,518 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:17,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:17,909 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 18:58:18,157 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:18,157 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:58:18,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1894896940] [2022-11-20 18:58:18,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1894896940] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:18,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1482891486] [2022-11-20 18:58:18,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:18,158 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:58:18,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:58:18,159 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:58:18,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (88)] Waiting until timeout for monitored process [2022-11-20 18:58:18,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:18,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:58:18,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:18,818 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:58:18,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:58:19,340 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:19,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:20,254 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:20,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1482891486] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:20,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410724001] [2022-11-20 18:58:20,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:20,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:58:20,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:58:20,255 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:58:20,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2022-11-20 18:58:20,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:20,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-20 18:58:20,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:20,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:58:20,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:58:20,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 18:58:20,942 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 10 [2022-11-20 18:58:20,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-20 18:58:21,068 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 18:58:21,068 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:58:21,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410724001] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:58:21,068 INFO L184 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2022-11-20 18:58:21,068 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5, 5, 5] total 23 [2022-11-20 18:58:21,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703418750] [2022-11-20 18:58:21,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:58:21,069 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 18:58:21,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:58:21,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 18:58:21,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-11-20 18:58:21,070 INFO L87 Difference]: Start difference. First operand 2292 states and 9252 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:22,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:58:22,042 INFO L93 Difference]: Finished difference Result 3244 states and 12876 transitions. [2022-11-20 18:58:22,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 18:58:22,044 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:58:22,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:58:22,054 INFO L225 Difference]: With dead ends: 3244 [2022-11-20 18:58:22,054 INFO L226 Difference]: Without dead ends: 3244 [2022-11-20 18:58:22,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=142, Invalid=728, Unknown=0, NotChecked=0, Total=870 [2022-11-20 18:58:22,055 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 99 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-20 18:58:22,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 17 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-20 18:58:22,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3244 states. [2022-11-20 18:58:22,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3244 to 2352. [2022-11-20 18:58:22,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2352 states, 2338 states have (on average 4.073139435414885) internal successors, (9523), 2351 states have internal predecessors, (9523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:22,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2352 states to 2352 states and 9523 transitions. [2022-11-20 18:58:22,141 INFO L78 Accepts]: Start accepts. Automaton has 2352 states and 9523 transitions. Word has length 12 [2022-11-20 18:58:22,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:58:22,141 INFO L495 AbstractCegarLoop]: Abstraction has 2352 states and 9523 transitions. [2022-11-20 18:58:22,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:22,142 INFO L276 IsEmpty]: Start isEmpty. Operand 2352 states and 9523 transitions. [2022-11-20 18:58:22,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:58:22,144 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:58:22,144 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:58:22,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (88)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:22,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2022-11-20 18:58:22,561 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (87)] Ended with exit code 0 [2022-11-20 18:58:22,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:22,752 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:58:22,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:58:22,753 INFO L85 PathProgramCache]: Analyzing trace with hash 1691818127, now seen corresponding path program 1 times [2022-11-20 18:58:22,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:58:22,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [34721705] [2022-11-20 18:58:22,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:22,753 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:22,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:58:22,755 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:58:22,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2022-11-20 18:58:23,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:23,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 18:58:23,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:23,251 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:23,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:23,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 18:58:24,065 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:24,065 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:58:24,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [34721705] [2022-11-20 18:58:24,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [34721705] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:24,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1524475963] [2022-11-20 18:58:24,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:24,066 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:58:24,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:58:24,067 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:58:24,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (91)] Waiting until timeout for monitored process [2022-11-20 18:58:24,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:24,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:58:24,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:25,068 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:25,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:26,004 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:26,004 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1524475963] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:26,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717030722] [2022-11-20 18:58:26,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:26,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:58:26,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:58:26,006 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:58:26,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2022-11-20 18:58:26,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:26,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:58:26,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:26,518 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:58:26,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:58:27,446 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:27,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:28,640 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:28,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717030722] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:28,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:58:28,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 18:58:28,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805641085] [2022-11-20 18:58:28,641 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:58:28,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 18:58:28,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:58:28,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 18:58:28,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 18:58:28,643 INFO L87 Difference]: Start difference. First operand 2352 states and 9523 transitions. Second operand has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:33,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:58:33,968 INFO L93 Difference]: Finished difference Result 2664 states and 10703 transitions. [2022-11-20 18:58:33,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-20 18:58:33,969 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:58:33,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:58:33,977 INFO L225 Difference]: With dead ends: 2664 [2022-11-20 18:58:33,977 INFO L226 Difference]: Without dead ends: 2664 [2022-11-20 18:58:33,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=328, Invalid=2122, Unknown=0, NotChecked=0, Total=2450 [2022-11-20 18:58:33,978 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 249 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 751 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 995 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 751 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 233 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-20 18:58:33,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [249 Valid, 127 Invalid, 995 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 751 Invalid, 0 Unknown, 233 Unchecked, 3.6s Time] [2022-11-20 18:58:33,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2664 states. [2022-11-20 18:58:34,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2664 to 2406. [2022-11-20 18:58:34,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2406 states, 2392 states have (on average 4.08319397993311) internal successors, (9767), 2405 states have internal predecessors, (9767), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:34,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2406 states to 2406 states and 9767 transitions. [2022-11-20 18:58:34,109 INFO L78 Accepts]: Start accepts. Automaton has 2406 states and 9767 transitions. Word has length 12 [2022-11-20 18:58:34,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:58:34,110 INFO L495 AbstractCegarLoop]: Abstraction has 2406 states and 9767 transitions. [2022-11-20 18:58:34,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:34,110 INFO L276 IsEmpty]: Start isEmpty. Operand 2406 states and 9767 transitions. [2022-11-20 18:58:34,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:58:34,111 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:58:34,112 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:58:34,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (91)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:34,332 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (90)] Ended with exit code 0 [2022-11-20 18:58:34,529 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:34,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:58:34,723 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:58:34,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:58:34,723 INFO L85 PathProgramCache]: Analyzing trace with hash 1691688857, now seen corresponding path program 2 times [2022-11-20 18:58:34,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:58:34,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1454676760] [2022-11-20 18:58:34,724 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:58:34,724 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:34,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:58:34,726 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:58:34,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (93)] Waiting until timeout for monitored process [2022-11-20 18:58:35,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:58:35,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:58:35,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:58:35,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:35,277 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 18:58:35,278 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 18:58:35,532 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:35,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:36,455 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:36,456 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:58:36,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1454676760] [2022-11-20 18:58:36,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1454676760] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:36,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [981834205] [2022-11-20 18:58:36,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:58:36,459 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:58:36,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:58:36,460 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:58:36,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (94)] Waiting until timeout for monitored process [2022-11-20 18:58:37,092 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:58:37,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:58:37,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 18:58:37,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:37,299 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:58:37,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:58:37,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-20 18:58:38,079 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:38,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:39,044 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:39,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [981834205] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:39,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871678725] [2022-11-20 18:58:39,044 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:58:39,044 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:58:39,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:58:39,045 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:58:39,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2022-11-20 18:58:39,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:58:39,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:58:39,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:58:39,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:39,602 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:58:39,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:58:40,575 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:40,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:41,683 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:41,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871678725] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:41,683 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:58:41,683 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 18:58:41,683 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974534504] [2022-11-20 18:58:41,684 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:58:41,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 18:58:41,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:58:41,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 18:58:41,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 18:58:41,685 INFO L87 Difference]: Start difference. First operand 2406 states and 9767 transitions. Second operand has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:47,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:58:47,240 INFO L93 Difference]: Finished difference Result 2751 states and 11074 transitions. [2022-11-20 18:58:47,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-20 18:58:47,241 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:58:47,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:58:47,249 INFO L225 Difference]: With dead ends: 2751 [2022-11-20 18:58:47,249 INFO L226 Difference]: Without dead ends: 2751 [2022-11-20 18:58:47,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=272, Invalid=1708, Unknown=0, NotChecked=0, Total=1980 [2022-11-20 18:58:47,250 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 202 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 1197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 298 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-20 18:58:47,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [202 Valid, 152 Invalid, 1197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 892 Invalid, 0 Unknown, 298 Unchecked, 4.3s Time] [2022-11-20 18:58:47,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2751 states. [2022-11-20 18:58:47,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2751 to 2426. [2022-11-20 18:58:47,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2426 states, 2412 states have (on average 4.089137645107795) internal successors, (9863), 2425 states have internal predecessors, (9863), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:47,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2426 states to 2426 states and 9863 transitions. [2022-11-20 18:58:47,337 INFO L78 Accepts]: Start accepts. Automaton has 2426 states and 9863 transitions. Word has length 12 [2022-11-20 18:58:47,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:58:47,338 INFO L495 AbstractCegarLoop]: Abstraction has 2426 states and 9863 transitions. [2022-11-20 18:58:47,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:47,338 INFO L276 IsEmpty]: Start isEmpty. Operand 2426 states and 9863 transitions. [2022-11-20 18:58:47,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:58:47,340 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:58:47,340 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:58:47,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (94)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:47,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (93)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:47,752 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2022-11-20 18:58:47,946 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:58:47,947 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:58:47,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:58:47,947 INFO L85 PathProgramCache]: Analyzing trace with hash 1691643969, now seen corresponding path program 2 times [2022-11-20 18:58:47,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:58:47,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1547726895] [2022-11-20 18:58:47,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:58:47,947 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:47,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:58:47,948 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:58:47,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (96)] Waiting until timeout for monitored process [2022-11-20 18:58:48,184 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 18:58:48,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:58:48,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:58:48,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:48,356 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:58:48,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:58:48,626 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 18:58:48,626 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:58:48,626 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:58:48,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1547726895] [2022-11-20 18:58:48,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1547726895] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:58:48,627 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:58:48,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 18:58:48,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177573868] [2022-11-20 18:58:48,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:58:48,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 18:58:48,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:58:48,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 18:58:48,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-20 18:58:48,628 INFO L87 Difference]: Start difference. First operand 2426 states and 9863 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:48,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:58:48,824 INFO L93 Difference]: Finished difference Result 2487 states and 10172 transitions. [2022-11-20 18:58:48,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 18:58:48,825 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:58:48,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:58:48,832 INFO L225 Difference]: With dead ends: 2487 [2022-11-20 18:58:48,832 INFO L226 Difference]: Without dead ends: 2487 [2022-11-20 18:58:48,832 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-20 18:58:48,833 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:58:48,833 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 12 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 31 Unchecked, 0.1s Time] [2022-11-20 18:58:48,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2487 states. [2022-11-20 18:58:48,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2487 to 2438. [2022-11-20 18:58:48,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2438 states, 2424 states have (on average 4.093646864686469) internal successors, (9923), 2437 states have internal predecessors, (9923), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:48,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2438 states to 2438 states and 9923 transitions. [2022-11-20 18:58:48,883 INFO L78 Accepts]: Start accepts. Automaton has 2438 states and 9923 transitions. Word has length 12 [2022-11-20 18:58:48,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:58:48,883 INFO L495 AbstractCegarLoop]: Abstraction has 2438 states and 9923 transitions. [2022-11-20 18:58:48,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:48,883 INFO L276 IsEmpty]: Start isEmpty. Operand 2438 states and 9923 transitions. [2022-11-20 18:58:48,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:58:48,884 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:58:48,884 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:58:48,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (96)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:49,085 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:49,086 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:58:49,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:58:49,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1692783870, now seen corresponding path program 1 times [2022-11-20 18:58:49,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:58:49,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1610430912] [2022-11-20 18:58:49,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:49,087 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:49,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:58:49,088 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:58:49,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (97)] Waiting until timeout for monitored process [2022-11-20 18:58:49,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:49,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 18:58:49,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:49,503 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:49,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:49,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 18:58:50,061 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:50,061 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:58:50,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1610430912] [2022-11-20 18:58:50,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1610430912] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:50,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [423439851] [2022-11-20 18:58:50,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:50,062 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:58:50,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:58:50,063 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:58:50,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (98)] Waiting until timeout for monitored process [2022-11-20 18:58:50,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:50,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:58:50,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:50,703 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:58:50,703 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:58:51,203 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:51,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:52,042 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:52,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [423439851] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:52,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62847980] [2022-11-20 18:58:52,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:52,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:58:52,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:58:52,044 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:58:52,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2022-11-20 18:58:52,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:52,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 18:58:52,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:52,435 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:52,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:52,579 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 18:58:52,620 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:52,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62847980] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:52,620 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:58:52,620 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 18 [2022-11-20 18:58:52,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554149009] [2022-11-20 18:58:52,621 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:58:52,621 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-20 18:58:52,621 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:58:52,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-20 18:58:52,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-11-20 18:58:52,622 INFO L87 Difference]: Start difference. First operand 2438 states and 9923 transitions. Second operand has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:55,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:58:55,670 INFO L93 Difference]: Finished difference Result 2541 states and 10255 transitions. [2022-11-20 18:58:55,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 18:58:55,671 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:58:55,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:58:55,678 INFO L225 Difference]: With dead ends: 2541 [2022-11-20 18:58:55,678 INFO L226 Difference]: Without dead ends: 2541 [2022-11-20 18:58:55,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=196, Invalid=674, Unknown=0, NotChecked=0, Total=870 [2022-11-20 18:58:55,679 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 162 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:58:55,679 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 91 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 404 Invalid, 0 Unknown, 53 Unchecked, 2.1s Time] [2022-11-20 18:58:55,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2541 states. [2022-11-20 18:58:55,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2541 to 2454. [2022-11-20 18:58:55,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2454 states, 2440 states have (on average 4.093032786885246) internal successors, (9987), 2453 states have internal predecessors, (9987), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:55,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2454 states to 2454 states and 9987 transitions. [2022-11-20 18:58:55,734 INFO L78 Accepts]: Start accepts. Automaton has 2454 states and 9987 transitions. Word has length 12 [2022-11-20 18:58:55,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:58:55,734 INFO L495 AbstractCegarLoop]: Abstraction has 2454 states and 9987 transitions. [2022-11-20 18:58:55,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:58:55,735 INFO L276 IsEmpty]: Start isEmpty. Operand 2454 states and 9987 transitions. [2022-11-20 18:58:55,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:58:55,737 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:58:55,737 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:58:55,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Forceful destruction successful, exit code 0 [2022-11-20 18:58:55,953 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (97)] Ended with exit code 0 [2022-11-20 18:58:56,149 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (98)] Ended with exit code 0 [2022-11-20 18:58:56,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:58:56,346 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:58:56,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:58:56,346 INFO L85 PathProgramCache]: Analyzing trace with hash 1692653871, now seen corresponding path program 1 times [2022-11-20 18:58:56,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:58:56,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [589596945] [2022-11-20 18:58:56,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:56,347 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:58:56,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:58:56,348 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:58:56,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (100)] Waiting until timeout for monitored process [2022-11-20 18:58:56,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:58:56,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 18:58:56,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:58:56,797 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:58:56,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:58:57,342 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:57,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:58:59,670 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:58:59,671 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:58:59,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [589596945] [2022-11-20 18:58:59,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [589596945] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:58:59,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [221597540] [2022-11-20 18:58:59,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:58:59,671 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:58:59,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:58:59,672 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:58:59,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (101)] Waiting until timeout for monitored process [2022-11-20 18:59:00,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:59:00,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 18:59:00,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:00,369 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:59:00,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:59:00,955 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:00,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:03,939 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:03,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [221597540] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:03,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044396535] [2022-11-20 18:59:03,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 18:59:03,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:59:03,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:59:03,941 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:59:03,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2022-11-20 18:59:04,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 18:59:04,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-20 18:59:04,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:04,392 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:59:04,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:59:04,817 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:04,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:05,629 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:05,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044396535] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:05,630 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:59:05,630 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 20 [2022-11-20 18:59:05,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50650698] [2022-11-20 18:59:05,630 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:59:05,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-20 18:59:05,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:59:05,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-20 18:59:05,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2022-11-20 18:59:05,631 INFO L87 Difference]: Start difference. First operand 2454 states and 9987 transitions. Second operand has 22 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 21 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:23,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:59:23,950 INFO L93 Difference]: Finished difference Result 4481 states and 17895 transitions. [2022-11-20 18:59:23,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-20 18:59:23,953 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 21 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:59:23,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:59:23,972 INFO L225 Difference]: With dead ends: 4481 [2022-11-20 18:59:23,973 INFO L226 Difference]: Without dead ends: 4481 [2022-11-20 18:59:23,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=341, Invalid=1219, Unknown=0, NotChecked=0, Total=1560 [2022-11-20 18:59:23,974 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 630 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 770 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 630 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 1304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 525 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:59:23,974 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [630 Valid, 167 Invalid, 1304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 770 Invalid, 0 Unknown, 525 Unchecked, 4.2s Time] [2022-11-20 18:59:23,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4481 states. [2022-11-20 18:59:24,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4481 to 3036. [2022-11-20 18:59:24,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3036 states, 3022 states have (on average 4.177365982792852) internal successors, (12624), 3035 states have internal predecessors, (12624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:24,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3036 states to 3036 states and 12624 transitions. [2022-11-20 18:59:24,084 INFO L78 Accepts]: Start accepts. Automaton has 3036 states and 12624 transitions. Word has length 12 [2022-11-20 18:59:24,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:59:24,084 INFO L495 AbstractCegarLoop]: Abstraction has 3036 states and 12624 transitions. [2022-11-20 18:59:24,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 21 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:24,085 INFO L276 IsEmpty]: Start isEmpty. Operand 3036 states and 12624 transitions. [2022-11-20 18:59:24,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:59:24,086 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:59:24,087 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:59:24,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2022-11-20 18:59:24,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (100)] Forceful destruction successful, exit code 0 [2022-11-20 18:59:24,500 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (101)] Ended with exit code 0 [2022-11-20 18:59:24,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:59:24,696 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:59:24,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:59:24,697 INFO L85 PathProgramCache]: Analyzing trace with hash 1692639720, now seen corresponding path program 2 times [2022-11-20 18:59:24,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:59:24,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1518967963] [2022-11-20 18:59:24,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:59:24,698 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:59:24,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:59:24,699 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:59:24,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (103)] Waiting until timeout for monitored process [2022-11-20 18:59:24,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-11-20 18:59:24,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:24,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:59:24,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:25,162 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:59:25,163 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:59:25,433 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 18:59:25,433 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:59:25,433 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:59:25,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1518967963] [2022-11-20 18:59:25,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1518967963] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:59:25,434 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:59:25,434 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 18:59:25,434 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178869506] [2022-11-20 18:59:25,434 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:59:25,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 18:59:25,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:59:25,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 18:59:25,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-20 18:59:25,435 INFO L87 Difference]: Start difference. First operand 3036 states and 12624 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:25,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:59:25,628 INFO L93 Difference]: Finished difference Result 3070 states and 12748 transitions. [2022-11-20 18:59:25,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 18:59:25,629 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:59:25,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:59:25,638 INFO L225 Difference]: With dead ends: 3070 [2022-11-20 18:59:25,638 INFO L226 Difference]: Without dead ends: 3070 [2022-11-20 18:59:25,638 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-20 18:59:25,638 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 7 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 18:59:25,639 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 15 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 27 Unchecked, 0.1s Time] [2022-11-20 18:59:25,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3070 states. [2022-11-20 18:59:25,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3070 to 3030. [2022-11-20 18:59:25,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3030 states, 3016 states have (on average 4.175729442970822) internal successors, (12594), 3029 states have internal predecessors, (12594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:25,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3030 states to 3030 states and 12594 transitions. [2022-11-20 18:59:25,767 INFO L78 Accepts]: Start accepts. Automaton has 3030 states and 12594 transitions. Word has length 12 [2022-11-20 18:59:25,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:59:25,768 INFO L495 AbstractCegarLoop]: Abstraction has 3030 states and 12594 transitions. [2022-11-20 18:59:25,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:25,768 INFO L276 IsEmpty]: Start isEmpty. Operand 3030 states and 12594 transitions. [2022-11-20 18:59:25,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:59:25,769 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:59:25,770 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:59:25,788 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (103)] Forceful destruction successful, exit code 0 [2022-11-20 18:59:25,982 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:59:25,983 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:59:25,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:59:25,983 INFO L85 PathProgramCache]: Analyzing trace with hash 1692640247, now seen corresponding path program 3 times [2022-11-20 18:59:25,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:59:25,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1938057449] [2022-11-20 18:59:25,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:59:25,984 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:59:25,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:59:25,985 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:59:26,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2022-11-20 18:59:26,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 18:59:26,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:26,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 18:59:26,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:26,495 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 18:59:26,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 18:59:26,692 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:26,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:27,471 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:59:27,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1938057449] [2022-11-20 18:59:27,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1938057449] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:27,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1178691274] [2022-11-20 18:59:27,472 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:59:27,472 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:59:27,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:59:27,474 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:59:27,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2022-11-20 18:59:28,099 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 18:59:28,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:28,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 18:59:28,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:28,305 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:59:28,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:59:28,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-20 18:59:29,077 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:29,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:30,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:30,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1178691274] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:30,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [98413161] [2022-11-20 18:59:30,009 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:59:30,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:59:30,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:59:30,010 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:59:30,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2022-11-20 18:59:30,354 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 18:59:30,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:30,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 18:59:30,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:30,526 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:59:30,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:59:31,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:31,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:32,427 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:32,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [98413161] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:32,427 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:59:32,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 18:59:32,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413746705] [2022-11-20 18:59:32,428 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:59:32,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 18:59:32,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:59:32,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 18:59:32,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 18:59:32,430 INFO L87 Difference]: Start difference. First operand 3030 states and 12594 transitions. Second operand has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:37,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:59:37,165 INFO L93 Difference]: Finished difference Result 3196 states and 13072 transitions. [2022-11-20 18:59:37,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 18:59:37,166 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:59:37,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:59:37,175 INFO L225 Difference]: With dead ends: 3196 [2022-11-20 18:59:37,175 INFO L226 Difference]: Without dead ends: 3196 [2022-11-20 18:59:37,176 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=274, Invalid=1706, Unknown=0, NotChecked=0, Total=1980 [2022-11-20 18:59:37,177 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 167 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 1059 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 266 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-20 18:59:37,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 124 Invalid, 1059 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 786 Invalid, 0 Unknown, 266 Unchecked, 3.5s Time] [2022-11-20 18:59:37,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3196 states. [2022-11-20 18:59:37,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3196 to 3026. [2022-11-20 18:59:37,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3026 states, 3012 states have (on average 4.175298804780876) internal successors, (12576), 3025 states have internal predecessors, (12576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:37,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3026 states to 3026 states and 12576 transitions. [2022-11-20 18:59:37,246 INFO L78 Accepts]: Start accepts. Automaton has 3026 states and 12576 transitions. Word has length 12 [2022-11-20 18:59:37,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:59:37,246 INFO L495 AbstractCegarLoop]: Abstraction has 3026 states and 12576 transitions. [2022-11-20 18:59:37,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 34 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:37,247 INFO L276 IsEmpty]: Start isEmpty. Operand 3026 states and 12576 transitions. [2022-11-20 18:59:37,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:59:37,248 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:59:37,249 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:59:37,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Forceful destruction successful, exit code 0 [2022-11-20 18:59:37,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (104)] Forceful destruction successful, exit code 0 [2022-11-20 18:59:37,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (105)] Forceful destruction successful, exit code 0 [2022-11-20 18:59:37,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:59:37,858 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:59:37,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:59:37,858 INFO L85 PathProgramCache]: Analyzing trace with hash 1525410189, now seen corresponding path program 3 times [2022-11-20 18:59:37,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:59:37,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [840482035] [2022-11-20 18:59:37,859 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:59:37,859 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:59:37,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:59:37,860 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:59:37,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2022-11-20 18:59:38,131 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-20 18:59:38,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:38,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 18:59:38,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:38,295 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:59:38,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:59:38,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 18:59:38,547 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 18:59:38,547 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:59:38,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [840482035] [2022-11-20 18:59:38,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [840482035] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 18:59:38,548 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 18:59:38,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 18:59:38,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407558519] [2022-11-20 18:59:38,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 18:59:38,548 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 18:59:38,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:59:38,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 18:59:38,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-20 18:59:38,549 INFO L87 Difference]: Start difference. First operand 3026 states and 12576 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:38,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:59:38,763 INFO L93 Difference]: Finished difference Result 3769 states and 16086 transitions. [2022-11-20 18:59:38,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 18:59:38,765 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:59:38,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:59:38,776 INFO L225 Difference]: With dead ends: 3769 [2022-11-20 18:59:38,777 INFO L226 Difference]: Without dead ends: 3769 [2022-11-20 18:59:38,777 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-20 18:59:38,777 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 67 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 18:59:38,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 15 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 67 Unchecked, 0.2s Time] [2022-11-20 18:59:38,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3769 states. [2022-11-20 18:59:38,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3769 to 2991. [2022-11-20 18:59:38,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2991 states, 2977 states have (on average 4.170977494121599) internal successors, (12417), 2990 states have internal predecessors, (12417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:38,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2991 states to 2991 states and 12417 transitions. [2022-11-20 18:59:38,915 INFO L78 Accepts]: Start accepts. Automaton has 2991 states and 12417 transitions. Word has length 12 [2022-11-20 18:59:38,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:59:38,916 INFO L495 AbstractCegarLoop]: Abstraction has 2991 states and 12417 transitions. [2022-11-20 18:59:38,916 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:38,916 INFO L276 IsEmpty]: Start isEmpty. Operand 2991 states and 12417 transitions. [2022-11-20 18:59:38,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 18:59:38,918 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:59:38,918 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 18:59:38,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (107)] Forceful destruction successful, exit code 0 [2022-11-20 18:59:39,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:59:39,131 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:59:39,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:59:39,131 INFO L85 PathProgramCache]: Analyzing trace with hash 1307313388, now seen corresponding path program 2 times [2022-11-20 18:59:39,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:59:39,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1783566826] [2022-11-20 18:59:39,132 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:59:39,132 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:59:39,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:59:39,133 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:59:39,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2022-11-20 18:59:39,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:59:39,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:39,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:59:39,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:39,790 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:39,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:40,295 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:40,295 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:59:40,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1783566826] [2022-11-20 18:59:40,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1783566826] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:40,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [605993768] [2022-11-20 18:59:40,296 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:59:40,296 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:59:40,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:59:40,298 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:59:40,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2022-11-20 18:59:40,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:59:40,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:40,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 18:59:40,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:41,066 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:41,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:41,156 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:41,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [605993768] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:41,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765441040] [2022-11-20 18:59:41,156 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 18:59:41,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:59:41,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:59:41,158 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:59:41,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2022-11-20 18:59:41,493 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 18:59:41,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:41,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 18:59:41,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:41,665 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:59:41,665 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:59:42,352 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:42,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:42,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-20 18:59:42,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 9 [2022-11-20 18:59:42,400 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-20 18:59:43,625 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:43,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [765441040] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:43,625 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:59:43,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 23 [2022-11-20 18:59:43,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359932695] [2022-11-20 18:59:43,626 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:59:43,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 18:59:43,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:59:43,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 18:59:43,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2022-11-20 18:59:43,627 INFO L87 Difference]: Start difference. First operand 2991 states and 12417 transitions. Second operand has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 23 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:47,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 18:59:47,968 INFO L93 Difference]: Finished difference Result 3475 states and 13665 transitions. [2022-11-20 18:59:47,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-20 18:59:47,970 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 23 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 18:59:47,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 18:59:47,980 INFO L225 Difference]: With dead ends: 3475 [2022-11-20 18:59:47,980 INFO L226 Difference]: Without dead ends: 3475 [2022-11-20 18:59:47,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=194, Invalid=928, Unknown=0, NotChecked=0, Total=1122 [2022-11-20 18:59:47,980 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 338 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 1058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 448 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-11-20 18:59:47,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [338 Valid, 122 Invalid, 1058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 604 Invalid, 0 Unknown, 448 Unchecked, 2.9s Time] [2022-11-20 18:59:47,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3475 states. [2022-11-20 18:59:48,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3475 to 3137. [2022-11-20 18:59:48,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3137 states, 3123 states have (on average 4.09702209414025) internal successors, (12795), 3136 states have internal predecessors, (12795), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:48,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3137 states to 3137 states and 12795 transitions. [2022-11-20 18:59:48,074 INFO L78 Accepts]: Start accepts. Automaton has 3137 states and 12795 transitions. Word has length 12 [2022-11-20 18:59:48,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 18:59:48,075 INFO L495 AbstractCegarLoop]: Abstraction has 3137 states and 12795 transitions. [2022-11-20 18:59:48,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 23 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 18:59:48,075 INFO L276 IsEmpty]: Start isEmpty. Operand 3137 states and 12795 transitions. [2022-11-20 18:59:48,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 18:59:48,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 18:59:48,076 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1] [2022-11-20 18:59:48,086 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (108)] Ended with exit code 0 [2022-11-20 18:59:48,283 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2022-11-20 18:59:48,482 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (109)] Ended with exit code 0 [2022-11-20 18:59:48,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 18:59:48,677 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 18:59:48,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 18:59:48,678 INFO L85 PathProgramCache]: Analyzing trace with hash -777406975, now seen corresponding path program 3 times [2022-11-20 18:59:48,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 18:59:48,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1635065621] [2022-11-20 18:59:48,678 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:59:48,678 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 18:59:48,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 18:59:48,679 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 18:59:48,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2022-11-20 18:59:49,177 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 18:59:49,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:49,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 18:59:49,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:49,383 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:59:49,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:59:50,056 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:50,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:50,075 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-20 18:59:50,105 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 9 [2022-11-20 18:59:50,110 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-20 18:59:51,797 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:51,798 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 18:59:51,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1635065621] [2022-11-20 18:59:51,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1635065621] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:51,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [513232273] [2022-11-20 18:59:51,798 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:59:51,798 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 18:59:51,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 18:59:51,799 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 18:59:51,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2022-11-20 18:59:53,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 18:59:53,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:53,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 18:59:53,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:53,201 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 18:59:53,201 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 18:59:53,410 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:53,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:53,425 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-20 18:59:53,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 9 [2022-11-20 18:59:53,456 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-20 18:59:53,623 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 18:59:53,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [513232273] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:53,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952782002] [2022-11-20 18:59:53,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 18:59:53,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 18:59:53,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 18:59:53,624 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 18:59:53,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2022-11-20 18:59:54,063 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 18:59:54,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 18:59:54,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 18:59:54,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 18:59:55,006 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:59:55,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 18:59:56,256 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 18:59:56,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952782002] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 18:59:56,256 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 18:59:56,256 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 10, 10] total 39 [2022-11-20 18:59:56,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513657732] [2022-11-20 18:59:56,257 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 18:59:56,257 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-20 18:59:56,257 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 18:59:56,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-20 18:59:56,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1387, Unknown=0, NotChecked=0, Total=1560 [2022-11-20 18:59:56,258 INFO L87 Difference]: Start difference. First operand 3137 states and 12795 transitions. Second operand has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:00:24,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:00:24,424 INFO L93 Difference]: Finished difference Result 5762 states and 22051 transitions. [2022-11-20 19:00:24,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-20 19:00:24,425 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:00:24,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:00:24,441 INFO L225 Difference]: With dead ends: 5762 [2022-11-20 19:00:24,441 INFO L226 Difference]: Without dead ends: 5762 [2022-11-20 19:00:24,443 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 37 SyntacticMatches, 9 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1729 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=897, Invalid=5745, Unknown=0, NotChecked=0, Total=6642 [2022-11-20 19:00:24,443 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 1152 mSDsluCounter, 731 mSDsCounter, 0 mSdLazyCounter, 3206 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1152 SdHoareTripleChecker+Valid, 767 SdHoareTripleChecker+Invalid, 3602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 3206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 355 IncrementalHoareTripleChecker+Unchecked, 14.9s IncrementalHoareTripleChecker+Time [2022-11-20 19:00:24,444 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1152 Valid, 767 Invalid, 3602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 3206 Invalid, 0 Unknown, 355 Unchecked, 14.9s Time] [2022-11-20 19:00:24,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5762 states. [2022-11-20 19:00:24,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5762 to 3416. [2022-11-20 19:00:24,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3416 states, 3402 states have (on average 4.120223398001176) internal successors, (14017), 3415 states have internal predecessors, (14017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:00:24,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3416 states to 3416 states and 14017 transitions. [2022-11-20 19:00:24,605 INFO L78 Accepts]: Start accepts. Automaton has 3416 states and 14017 transitions. Word has length 13 [2022-11-20 19:00:24,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:00:24,606 INFO L495 AbstractCegarLoop]: Abstraction has 3416 states and 14017 transitions. [2022-11-20 19:00:24,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.2) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:00:24,606 INFO L276 IsEmpty]: Start isEmpty. Operand 3416 states and 14017 transitions. [2022-11-20 19:00:24,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:00:24,608 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:00:24,608 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:00:24,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (111)] Forceful destruction successful, exit code 0 [2022-11-20 19:00:24,833 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (112)] Ended with exit code 0 [2022-11-20 19:00:25,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Forceful destruction successful, exit code 0 [2022-11-20 19:00:25,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:00:25,227 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:00:25,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:00:25,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1150937435, now seen corresponding path program 4 times [2022-11-20 19:00:25,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:00:25,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [67076525] [2022-11-20 19:00:25,228 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:00:25,228 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:00:25,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:00:25,229 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:00:25,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (114)] Waiting until timeout for monitored process [2022-11-20 19:00:25,573 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:00:25,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:00:25,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:00:25,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:00:25,826 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:00:25,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:00:26,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:00:26,630 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:00:26,631 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:00:26,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [67076525] [2022-11-20 19:00:26,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [67076525] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:00:26,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [742351675] [2022-11-20 19:00:26,631 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:00:26,631 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:00:26,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:00:26,632 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:00:26,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (115)] Waiting until timeout for monitored process [2022-11-20 19:00:27,235 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:00:27,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:00:27,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 19:00:27,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:00:27,421 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:00:27,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:00:28,195 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:28,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:00:29,298 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:29,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [742351675] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:00:29,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800382453] [2022-11-20 19:00:29,298 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:00:29,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:00:29,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:00:29,300 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:00:29,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2022-11-20 19:00:29,662 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:00:29,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:00:29,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 19:00:29,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:00:29,841 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:00:29,842 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:00:30,701 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:00:30,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:00:31,267 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:00:31,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800382453] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:00:31,268 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:00:31,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7, 7, 6, 6] total 31 [2022-11-20 19:00:31,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722562643] [2022-11-20 19:00:31,268 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:00:31,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-20 19:00:31,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:00:31,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-20 19:00:31,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=895, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 19:00:31,269 INFO L87 Difference]: Start difference. First operand 3416 states and 14017 transitions. Second operand has 33 states, 32 states have (on average 1.875) internal successors, (60), 32 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:00:36,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:00:36,946 INFO L93 Difference]: Finished difference Result 3473 states and 14189 transitions. [2022-11-20 19:00:36,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-20 19:00:36,947 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.875) internal successors, (60), 32 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:00:36,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:00:36,956 INFO L225 Difference]: With dead ends: 3473 [2022-11-20 19:00:36,957 INFO L226 Difference]: Without dead ends: 3473 [2022-11-20 19:00:36,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=214, Invalid=1118, Unknown=0, NotChecked=0, Total=1332 [2022-11-20 19:00:36,957 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 145 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 152 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-20 19:00:36,957 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [145 Valid, 175 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 249 Invalid, 0 Unknown, 152 Unchecked, 1.0s Time] [2022-11-20 19:00:36,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3473 states. [2022-11-20 19:00:37,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3473 to 3414. [2022-11-20 19:00:37,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3414 states, 3400 states have (on average 4.1191176470588236) internal successors, (14005), 3413 states have internal predecessors, (14005), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:00:37,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3414 states to 3414 states and 14005 transitions. [2022-11-20 19:00:37,093 INFO L78 Accepts]: Start accepts. Automaton has 3414 states and 14005 transitions. Word has length 13 [2022-11-20 19:00:37,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:00:37,094 INFO L495 AbstractCegarLoop]: Abstraction has 3414 states and 14005 transitions. [2022-11-20 19:00:37,094 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.875) internal successors, (60), 32 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:00:37,094 INFO L276 IsEmpty]: Start isEmpty. Operand 3414 states and 14005 transitions. [2022-11-20 19:00:37,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:00:37,096 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:00:37,096 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:00:37,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Forceful destruction successful, exit code 0 [2022-11-20 19:00:37,305 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (114)] Ended with exit code 0 [2022-11-20 19:00:37,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (115)] Ended with exit code 0 [2022-11-20 19:00:37,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 19:00:37,697 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:00:37,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:00:37,698 INFO L85 PathProgramCache]: Analyzing trace with hash 287571711, now seen corresponding path program 1 times [2022-11-20 19:00:37,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:00:37,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [413158275] [2022-11-20 19:00:37,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:00:37,698 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:00:37,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:00:37,699 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:00:37,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (117)] Waiting until timeout for monitored process [2022-11-20 19:00:37,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:00:37,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:00:37,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:00:38,198 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:38,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:00:38,693 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:00:39,003 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:39,003 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:00:39,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [413158275] [2022-11-20 19:00:39,004 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [413158275] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:00:39,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [286953306] [2022-11-20 19:00:39,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:00:39,004 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:00:39,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:00:39,005 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:00:39,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (118)] Waiting until timeout for monitored process [2022-11-20 19:00:39,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:00:39,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 19:00:39,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:00:40,066 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:40,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:00:40,962 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:40,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [286953306] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:00:40,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973955876] [2022-11-20 19:00:40,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:00:40,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:00:40,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:00:40,964 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:00:40,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2022-11-20 19:00:41,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:00:41,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:00:41,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:00:41,469 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:00:41,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:00:42,320 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:42,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:00:43,212 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:43,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973955876] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:00:43,212 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:00:43,212 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 19:00:43,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348295993] [2022-11-20 19:00:43,213 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:00:43,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 19:00:43,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:00:43,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 19:00:43,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:00:43,214 INFO L87 Difference]: Start difference. First operand 3414 states and 14005 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:00:49,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:00:49,367 INFO L93 Difference]: Finished difference Result 4135 states and 16321 transitions. [2022-11-20 19:00:49,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-20 19:00:49,368 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:00:49,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:00:49,380 INFO L225 Difference]: With dead ends: 4135 [2022-11-20 19:00:49,380 INFO L226 Difference]: Without dead ends: 4135 [2022-11-20 19:00:49,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 612 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=375, Invalid=2487, Unknown=0, NotChecked=0, Total=2862 [2022-11-20 19:00:49,381 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 339 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 1035 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 1395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1035 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 348 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:00:49,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [339 Valid, 129 Invalid, 1395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1035 Invalid, 0 Unknown, 348 Unchecked, 4.1s Time] [2022-11-20 19:00:49,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4135 states. [2022-11-20 19:00:49,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4135 to 3468. [2022-11-20 19:00:49,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3468 states, 3454 states have (on average 4.12507237984945) internal successors, (14248), 3467 states have internal predecessors, (14248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:00:49,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3468 states to 3468 states and 14248 transitions. [2022-11-20 19:00:49,512 INFO L78 Accepts]: Start accepts. Automaton has 3468 states and 14248 transitions. Word has length 13 [2022-11-20 19:00:49,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:00:49,513 INFO L495 AbstractCegarLoop]: Abstraction has 3468 states and 14248 transitions. [2022-11-20 19:00:49,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:00:49,513 INFO L276 IsEmpty]: Start isEmpty. Operand 3468 states and 14248 transitions. [2022-11-20 19:00:49,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:00:49,516 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:00:49,517 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:00:49,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (118)] Forceful destruction successful, exit code 0 [2022-11-20 19:00:49,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (117)] Ended with exit code 0 [2022-11-20 19:00:49,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Forceful destruction successful, exit code 0 [2022-11-20 19:00:50,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:00:50,124 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:00:50,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:00:50,124 INFO L85 PathProgramCache]: Analyzing trace with hash 282209331, now seen corresponding path program 2 times [2022-11-20 19:00:50,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:00:50,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1719883660] [2022-11-20 19:00:50,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:00:50,125 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:00:50,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:00:50,126 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:00:50,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (120)] Waiting until timeout for monitored process [2022-11-20 19:00:50,462 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:00:50,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:00:50,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 19:00:50,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:00:50,643 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 19:00:50,643 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 19:00:50,874 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:50,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:00:51,621 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:51,621 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:00:51,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1719883660] [2022-11-20 19:00:51,622 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1719883660] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:00:51,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1678192010] [2022-11-20 19:00:51,622 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:00:51,622 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:00:51,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:00:51,623 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:00:51,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (121)] Waiting until timeout for monitored process [2022-11-20 19:00:52,231 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:00:52,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:00:52,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 19:00:52,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:00:52,411 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:00:52,412 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:00:52,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-20 19:00:53,253 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:53,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:00:54,340 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:54,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1678192010] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:00:54,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337171465] [2022-11-20 19:00:54,340 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:00:54,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:00:54,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:00:54,341 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:00:54,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2022-11-20 19:00:54,728 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:00:54,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:00:54,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:00:54,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:00:54,890 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:00:54,890 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:00:55,760 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:55,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:00:56,890 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:00:56,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337171465] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:00:56,891 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:00:56,891 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 8, 8, 6, 6] total 37 [2022-11-20 19:00:56,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746544059] [2022-11-20 19:00:56,891 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:00:56,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-20 19:00:56,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:00:56,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-20 19:00:56,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1311, Unknown=0, NotChecked=0, Total=1482 [2022-11-20 19:00:56,892 INFO L87 Difference]: Start difference. First operand 3468 states and 14248 transitions. Second operand has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:04,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:01:04,521 INFO L93 Difference]: Finished difference Result 5141 states and 19733 transitions. [2022-11-20 19:01:04,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-20 19:01:04,522 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:01:04,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:01:04,535 INFO L225 Difference]: With dead ends: 5141 [2022-11-20 19:01:04,535 INFO L226 Difference]: Without dead ends: 5141 [2022-11-20 19:01:04,536 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 915 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=452, Invalid=2970, Unknown=0, NotChecked=0, Total=3422 [2022-11-20 19:01:04,536 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 364 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 1202 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 1776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 559 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:01:04,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [364 Valid, 139 Invalid, 1776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1202 Invalid, 0 Unknown, 559 Unchecked, 5.1s Time] [2022-11-20 19:01:04,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5141 states. [2022-11-20 19:01:04,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5141 to 3499. [2022-11-20 19:01:04,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3499 states, 3485 states have (on average 4.127977044476327) internal successors, (14386), 3498 states have internal predecessors, (14386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:04,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3499 states to 3499 states and 14386 transitions. [2022-11-20 19:01:04,638 INFO L78 Accepts]: Start accepts. Automaton has 3499 states and 14386 transitions. Word has length 13 [2022-11-20 19:01:04,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:01:04,638 INFO L495 AbstractCegarLoop]: Abstraction has 3499 states and 14386 transitions. [2022-11-20 19:01:04,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:04,638 INFO L276 IsEmpty]: Start isEmpty. Operand 3499 states and 14386 transitions. [2022-11-20 19:01:04,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:01:04,644 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:01:04,645 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:01:04,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Forceful destruction successful, exit code 0 [2022-11-20 19:01:04,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (120)] Forceful destruction successful, exit code 0 [2022-11-20 19:01:05,060 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (121)] Ended with exit code 0 [2022-11-20 19:01:05,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 19:01:05,254 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:01:05,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:01:05,255 INFO L85 PathProgramCache]: Analyzing trace with hash 282196311, now seen corresponding path program 3 times [2022-11-20 19:01:05,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:01:05,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [693426743] [2022-11-20 19:01:05,255 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:01:05,255 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:01:05,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:01:05,256 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:01:05,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (123)] Waiting until timeout for monitored process [2022-11-20 19:01:05,585 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 19:01:05,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:05,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 19:01:05,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:05,750 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 19:01:05,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 19:01:05,952 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:05,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:06,805 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:06,806 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:01:06,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [693426743] [2022-11-20 19:01:06,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [693426743] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:06,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1889464861] [2022-11-20 19:01:06,806 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:01:06,806 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:01:06,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:01:06,807 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:01:06,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (124)] Waiting until timeout for monitored process [2022-11-20 19:01:07,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 19:01:07,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:07,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 19:01:07,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:07,603 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:01:07,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:01:07,809 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-20 19:01:08,702 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:08,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:09,947 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:09,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1889464861] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:09,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020198798] [2022-11-20 19:01:09,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:01:09,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:01:09,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:01:09,949 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:01:09,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2022-11-20 19:01:10,321 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 19:01:10,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:10,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:01:10,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:10,515 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:01:10,516 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:01:11,445 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:11,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:12,536 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:12,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020198798] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:12,537 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:01:12,537 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 8, 8, 6, 6] total 37 [2022-11-20 19:01:12,537 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018860802] [2022-11-20 19:01:12,537 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:01:12,537 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-20 19:01:12,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:01:12,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-20 19:01:12,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1311, Unknown=0, NotChecked=0, Total=1482 [2022-11-20 19:01:12,538 INFO L87 Difference]: Start difference. First operand 3499 states and 14386 transitions. Second operand has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:22,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:01:22,714 INFO L93 Difference]: Finished difference Result 5793 states and 22901 transitions. [2022-11-20 19:01:22,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-20 19:01:22,715 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:01:22,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:01:22,731 INFO L225 Difference]: With dead ends: 5793 [2022-11-20 19:01:22,731 INFO L226 Difference]: Without dead ends: 5793 [2022-11-20 19:01:22,732 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 953 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=485, Invalid=3297, Unknown=0, NotChecked=0, Total=3782 [2022-11-20 19:01:22,732 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 261 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 1597 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 2024 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 416 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:01:22,732 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 171 Invalid, 2024 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1597 Invalid, 0 Unknown, 416 Unchecked, 7.2s Time] [2022-11-20 19:01:22,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5793 states. [2022-11-20 19:01:22,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5793 to 3734. [2022-11-20 19:01:22,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3734 states, 3720 states have (on average 4.20510752688172) internal successors, (15643), 3733 states have internal predecessors, (15643), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:22,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3734 states to 3734 states and 15643 transitions. [2022-11-20 19:01:22,861 INFO L78 Accepts]: Start accepts. Automaton has 3734 states and 15643 transitions. Word has length 13 [2022-11-20 19:01:22,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:01:22,862 INFO L495 AbstractCegarLoop]: Abstraction has 3734 states and 15643 transitions. [2022-11-20 19:01:22,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:22,862 INFO L276 IsEmpty]: Start isEmpty. Operand 3734 states and 15643 transitions. [2022-11-20 19:01:22,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:01:22,864 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:01:22,864 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:01:22,873 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Ended with exit code 0 [2022-11-20 19:01:23,076 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (124)] Ended with exit code 0 [2022-11-20 19:01:23,283 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (123)] Ended with exit code 0 [2022-11-20 19:01:23,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:01:23,472 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:01:23,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:01:23,473 INFO L85 PathProgramCache]: Analyzing trace with hash 1229399827, now seen corresponding path program 4 times [2022-11-20 19:01:23,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:01:23,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1915529085] [2022-11-20 19:01:23,473 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:01:23,473 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:01:23,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:01:23,475 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:01:23,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (126)] Waiting until timeout for monitored process [2022-11-20 19:01:23,776 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:01:23,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:23,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:01:23,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:23,970 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:23,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:24,433 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:01:24,698 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:24,698 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:01:24,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1915529085] [2022-11-20 19:01:24,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1915529085] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:24,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1967863921] [2022-11-20 19:01:24,699 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:01:24,699 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:01:24,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:01:24,703 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:01:24,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (127)] Waiting until timeout for monitored process [2022-11-20 19:01:25,255 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:01:25,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:25,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 19:01:25,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:25,707 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:25,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:26,530 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:26,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1967863921] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:26,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047412962] [2022-11-20 19:01:26,530 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:01:26,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:01:26,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:01:26,532 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:01:26,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2022-11-20 19:01:26,870 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:01:26,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:26,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:01:26,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:27,053 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:01:27,053 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:01:27,989 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:27,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:29,071 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:29,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047412962] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:29,071 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:01:29,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 19:01:29,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886056353] [2022-11-20 19:01:29,072 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:01:29,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 19:01:29,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:01:29,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 19:01:29,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:01:29,073 INFO L87 Difference]: Start difference. First operand 3734 states and 15643 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:34,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:01:34,700 INFO L93 Difference]: Finished difference Result 4445 states and 17941 transitions. [2022-11-20 19:01:34,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-20 19:01:34,701 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:01:34,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:01:34,713 INFO L225 Difference]: With dead ends: 4445 [2022-11-20 19:01:34,713 INFO L226 Difference]: Without dead ends: 4445 [2022-11-20 19:01:34,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 592 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=364, Invalid=2392, Unknown=0, NotChecked=0, Total=2756 [2022-11-20 19:01:34,714 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 314 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 1078 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1078 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 422 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-20 19:01:34,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 143 Invalid, 1509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1078 Invalid, 0 Unknown, 422 Unchecked, 3.8s Time] [2022-11-20 19:01:34,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4445 states. [2022-11-20 19:01:34,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4445 to 3765. [2022-11-20 19:01:34,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3765 states, 3751 states have (on average 4.206344974673421) internal successors, (15778), 3764 states have internal predecessors, (15778), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:34,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3765 states to 3765 states and 15778 transitions. [2022-11-20 19:01:34,812 INFO L78 Accepts]: Start accepts. Automaton has 3765 states and 15778 transitions. Word has length 13 [2022-11-20 19:01:34,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:01:34,812 INFO L495 AbstractCegarLoop]: Abstraction has 3765 states and 15778 transitions. [2022-11-20 19:01:34,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:34,812 INFO L276 IsEmpty]: Start isEmpty. Operand 3765 states and 15778 transitions. [2022-11-20 19:01:34,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:01:34,814 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:01:34,814 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:01:34,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (126)] Forceful destruction successful, exit code 0 [2022-11-20 19:01:35,019 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (127)] Ended with exit code 0 [2022-11-20 19:01:35,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Forceful destruction successful, exit code 0 [2022-11-20 19:01:35,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:01:35,415 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:01:35,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:01:35,415 INFO L85 PathProgramCache]: Analyzing trace with hash 1063166047, now seen corresponding path program 5 times [2022-11-20 19:01:35,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:01:35,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [689141619] [2022-11-20 19:01:35,416 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-20 19:01:35,416 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:01:35,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:01:35,417 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:01:35,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (129)] Waiting until timeout for monitored process [2022-11-20 19:01:35,743 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:01:35,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:35,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:01:35,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:35,972 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:35,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:36,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:01:36,617 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:36,617 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:01:36,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [689141619] [2022-11-20 19:01:36,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [689141619] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:36,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1260222828] [2022-11-20 19:01:36,618 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-20 19:01:36,618 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:01:36,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:01:36,619 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:01:36,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (130)] Waiting until timeout for monitored process [2022-11-20 19:01:37,223 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:01:37,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:37,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 19:01:37,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:37,670 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:37,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:38,533 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:38,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1260222828] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:38,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904508465] [2022-11-20 19:01:38,533 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-20 19:01:38,533 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:01:38,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:01:38,534 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:01:38,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2022-11-20 19:01:38,936 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:01:38,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:38,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:01:38,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:39,092 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:01:39,093 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:01:39,918 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:39,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:40,905 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:40,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904508465] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:40,905 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:01:40,905 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 19:01:40,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542084860] [2022-11-20 19:01:40,906 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:01:40,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 19:01:40,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:01:40,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 19:01:40,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:01:40,907 INFO L87 Difference]: Start difference. First operand 3765 states and 15778 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:46,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:01:46,945 INFO L93 Difference]: Finished difference Result 4589 states and 18916 transitions. [2022-11-20 19:01:46,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-20 19:01:46,946 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:01:46,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:01:46,956 INFO L225 Difference]: With dead ends: 4589 [2022-11-20 19:01:46,957 INFO L226 Difference]: Without dead ends: 4589 [2022-11-20 19:01:46,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=340, Invalid=2210, Unknown=0, NotChecked=0, Total=2550 [2022-11-20 19:01:46,957 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 411 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 1184 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 411 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 1675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 480 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-20 19:01:46,957 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [411 Valid, 160 Invalid, 1675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1184 Invalid, 0 Unknown, 480 Unchecked, 4.4s Time] [2022-11-20 19:01:46,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4589 states. [2022-11-20 19:01:47,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4589 to 3867. [2022-11-20 19:01:47,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3867 states, 3853 states have (on average 4.237996366467687) internal successors, (16329), 3866 states have internal predecessors, (16329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:47,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3867 states to 3867 states and 16329 transitions. [2022-11-20 19:01:47,030 INFO L78 Accepts]: Start accepts. Automaton has 3867 states and 16329 transitions. Word has length 13 [2022-11-20 19:01:47,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:01:47,031 INFO L495 AbstractCegarLoop]: Abstraction has 3867 states and 16329 transitions. [2022-11-20 19:01:47,031 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:01:47,031 INFO L276 IsEmpty]: Start isEmpty. Operand 3867 states and 16329 transitions. [2022-11-20 19:01:47,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:01:47,032 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:01:47,032 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:01:47,038 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (130)] Ended with exit code 0 [2022-11-20 19:01:47,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (129)] Forceful destruction successful, exit code 0 [2022-11-20 19:01:47,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Forceful destruction successful, exit code 0 [2022-11-20 19:01:47,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:01:47,633 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:01:47,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:01:47,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1063174417, now seen corresponding path program 6 times [2022-11-20 19:01:47,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:01:47,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1692057476] [2022-11-20 19:01:47,634 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-11-20 19:01:47,634 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:01:47,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:01:47,644 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:01:47,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (132)] Waiting until timeout for monitored process [2022-11-20 19:01:48,042 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2022-11-20 19:01:48,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:48,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 19:01:48,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:48,178 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 19:01:48,179 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 19:01:48,352 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:48,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:49,047 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:49,047 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:01:49,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1692057476] [2022-11-20 19:01:49,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1692057476] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:49,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [25159031] [2022-11-20 19:01:49,047 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-11-20 19:01:49,047 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:01:49,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:01:49,048 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:01:49,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (133)] Waiting until timeout for monitored process [2022-11-20 19:01:49,705 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2022-11-20 19:01:49,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:49,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 19:01:49,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:49,887 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:01:49,887 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:01:50,065 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 19:01:50,794 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:50,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:51,947 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:51,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [25159031] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:51,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072004380] [2022-11-20 19:01:51,947 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-11-20 19:01:51,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:01:51,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:01:51,948 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:01:51,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2022-11-20 19:01:52,353 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2022-11-20 19:01:52,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:01:52,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:01:52,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:01:52,513 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:01:52,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:01:53,331 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:53,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:01:54,331 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:01:54,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072004380] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:01:54,331 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:01:54,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 8, 8, 6, 6] total 37 [2022-11-20 19:01:54,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816577841] [2022-11-20 19:01:54,331 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:01:54,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-20 19:01:54,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:01:54,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-20 19:01:54,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1311, Unknown=0, NotChecked=0, Total=1482 [2022-11-20 19:01:54,332 INFO L87 Difference]: Start difference. First operand 3867 states and 16329 transitions. Second operand has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:06,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:02:06,836 INFO L93 Difference]: Finished difference Result 6904 states and 27413 transitions. [2022-11-20 19:02:06,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-20 19:02:06,837 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:02:06,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:02:06,855 INFO L225 Difference]: With dead ends: 6904 [2022-11-20 19:02:06,855 INFO L226 Difference]: Without dead ends: 6904 [2022-11-20 19:02:06,855 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1088 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=547, Invalid=3485, Unknown=0, NotChecked=0, Total=4032 [2022-11-20 19:02:06,856 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 768 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 1816 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 768 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 4206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2374 IncrementalHoareTripleChecker+Unchecked, 8.5s IncrementalHoareTripleChecker+Time [2022-11-20 19:02:06,856 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [768 Valid, 200 Invalid, 4206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1816 Invalid, 0 Unknown, 2374 Unchecked, 8.5s Time] [2022-11-20 19:02:06,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6904 states. [2022-11-20 19:02:06,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6904 to 4148. [2022-11-20 19:02:06,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4148 states, 4134 states have (on average 4.293904208998549) internal successors, (17751), 4147 states have internal predecessors, (17751), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:06,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4148 states to 4148 states and 17751 transitions. [2022-11-20 19:02:06,954 INFO L78 Accepts]: Start accepts. Automaton has 4148 states and 17751 transitions. Word has length 13 [2022-11-20 19:02:06,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:02:06,955 INFO L495 AbstractCegarLoop]: Abstraction has 4148 states and 17751 transitions. [2022-11-20 19:02:06,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:06,955 INFO L276 IsEmpty]: Start isEmpty. Operand 4148 states and 17751 transitions. [2022-11-20 19:02:06,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:02:06,956 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:02:06,956 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:02:06,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (132)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:07,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:07,362 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (133)] Ended with exit code 0 [2022-11-20 19:02:07,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 19:02:07,557 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:02:07,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:02:07,558 INFO L85 PathProgramCache]: Analyzing trace with hash 902748888, now seen corresponding path program 1 times [2022-11-20 19:02:07,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:02:07,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [951715764] [2022-11-20 19:02:07,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:02:07,558 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:02:07,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:02:07,559 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:02:07,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (135)] Waiting until timeout for monitored process [2022-11-20 19:02:07,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:02:07,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:02:07,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:08,074 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:08,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:08,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:02:08,761 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:08,761 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:02:08,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [951715764] [2022-11-20 19:02:08,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [951715764] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:08,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1171969392] [2022-11-20 19:02:08,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:02:08,761 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:02:08,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:02:08,762 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:02:08,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (136)] Waiting until timeout for monitored process [2022-11-20 19:02:09,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:02:09,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 19:02:09,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:09,801 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:09,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:10,699 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:10,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1171969392] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:10,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529253755] [2022-11-20 19:02:10,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:02:10,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:02:10,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:02:10,700 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:02:10,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Waiting until timeout for monitored process [2022-11-20 19:02:11,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:02:11,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:02:11,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:11,218 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:02:11,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:02:12,048 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:12,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:13,023 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:13,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529253755] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:13,023 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:02:13,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 19:02:13,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178183111] [2022-11-20 19:02:13,024 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:02:13,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 19:02:13,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:02:13,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 19:02:13,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:02:13,025 INFO L87 Difference]: Start difference. First operand 4148 states and 17751 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:17,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:02:17,002 INFO L93 Difference]: Finished difference Result 4287 states and 18231 transitions. [2022-11-20 19:02:17,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-20 19:02:17,003 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:02:17,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:02:17,017 INFO L225 Difference]: With dead ends: 4287 [2022-11-20 19:02:17,017 INFO L226 Difference]: Without dead ends: 4287 [2022-11-20 19:02:17,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=328, Invalid=2122, Unknown=0, NotChecked=0, Total=2450 [2022-11-20 19:02:17,017 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 225 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 135 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-20 19:02:17,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [225 Valid, 122 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 662 Invalid, 0 Unknown, 135 Unchecked, 2.3s Time] [2022-11-20 19:02:17,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4287 states. [2022-11-20 19:02:17,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4287 to 4158. [2022-11-20 19:02:17,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4158 states, 4144 states have (on average 4.295608108108108) internal successors, (17801), 4157 states have internal predecessors, (17801), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:17,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4158 states to 4158 states and 17801 transitions. [2022-11-20 19:02:17,124 INFO L78 Accepts]: Start accepts. Automaton has 4158 states and 17801 transitions. Word has length 13 [2022-11-20 19:02:17,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:02:17,124 INFO L495 AbstractCegarLoop]: Abstraction has 4158 states and 17801 transitions. [2022-11-20 19:02:17,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:17,124 INFO L276 IsEmpty]: Start isEmpty. Operand 4158 states and 17801 transitions. [2022-11-20 19:02:17,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:02:17,125 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:02:17,125 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:02:17,133 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Ended with exit code 0 [2022-11-20 19:02:17,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (136)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:17,534 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (135)] Ended with exit code 0 [2022-11-20 19:02:17,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:02:17,726 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:02:17,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:02:17,727 INFO L85 PathProgramCache]: Analyzing trace with hash 902744517, now seen corresponding path program 1 times [2022-11-20 19:02:17,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:02:17,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [88422114] [2022-11-20 19:02:17,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:02:17,727 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:02:17,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:02:17,728 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:02:17,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (138)] Waiting until timeout for monitored process [2022-11-20 19:02:18,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:02:18,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:02:18,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:18,222 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:18,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:18,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:02:18,915 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:18,915 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:02:18,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [88422114] [2022-11-20 19:02:18,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [88422114] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:18,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [7483138] [2022-11-20 19:02:18,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:02:18,916 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:02:18,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:02:18,917 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:02:18,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (139)] Waiting until timeout for monitored process [2022-11-20 19:02:19,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:02:19,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 19:02:19,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:19,921 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:19,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:20,810 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:20,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [7483138] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:20,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565752472] [2022-11-20 19:02:20,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:02:20,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:02:20,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:02:20,812 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:02:20,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Waiting until timeout for monitored process [2022-11-20 19:02:21,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:02:21,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:02:21,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:21,382 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:02:21,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:02:22,354 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:22,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:23,414 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:23,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565752472] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:23,414 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:02:23,414 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 19:02:23,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66584594] [2022-11-20 19:02:23,415 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:02:23,415 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 19:02:23,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:02:23,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 19:02:23,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:02:23,415 INFO L87 Difference]: Start difference. First operand 4158 states and 17801 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:29,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:02:29,001 INFO L93 Difference]: Finished difference Result 4421 states and 18665 transitions. [2022-11-20 19:02:29,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-20 19:02:29,002 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:02:29,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:02:29,015 INFO L225 Difference]: With dead ends: 4421 [2022-11-20 19:02:29,015 INFO L226 Difference]: Without dead ends: 4421 [2022-11-20 19:02:29,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=328, Invalid=2122, Unknown=0, NotChecked=0, Total=2450 [2022-11-20 19:02:29,016 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 264 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 865 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 1139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 865 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 266 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-20 19:02:29,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 129 Invalid, 1139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 865 Invalid, 0 Unknown, 266 Unchecked, 3.8s Time] [2022-11-20 19:02:29,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4421 states. [2022-11-20 19:02:29,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4421 to 4188. [2022-11-20 19:02:29,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4188 states, 4174 states have (on average 4.303545759463344) internal successors, (17963), 4187 states have internal predecessors, (17963), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:29,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4188 states to 4188 states and 17963 transitions. [2022-11-20 19:02:29,113 INFO L78 Accepts]: Start accepts. Automaton has 4188 states and 17963 transitions. Word has length 13 [2022-11-20 19:02:29,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:02:29,113 INFO L495 AbstractCegarLoop]: Abstraction has 4188 states and 17963 transitions. [2022-11-20 19:02:29,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:29,114 INFO L276 IsEmpty]: Start isEmpty. Operand 4188 states and 17963 transitions. [2022-11-20 19:02:29,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:02:29,116 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:02:29,117 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:02:29,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (139)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:29,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (138)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:29,531 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Ended with exit code 0 [2022-11-20 19:02:29,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:02:29,725 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:02:29,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:02:29,725 INFO L85 PathProgramCache]: Analyzing trace with hash 902570948, now seen corresponding path program 1 times [2022-11-20 19:02:29,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:02:29,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1310410491] [2022-11-20 19:02:29,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:02:29,726 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:02:29,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:02:29,726 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:02:29,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (141)] Waiting until timeout for monitored process [2022-11-20 19:02:30,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:02:30,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 19:02:30,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:30,311 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:30,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:30,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2022-11-20 19:02:30,931 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:30,931 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:02:30,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1310410491] [2022-11-20 19:02:30,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1310410491] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:30,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1144291311] [2022-11-20 19:02:30,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:02:30,931 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:02:30,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:02:30,932 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:02:30,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (142)] Waiting until timeout for monitored process [2022-11-20 19:02:31,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:02:31,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 19:02:31,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:31,704 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:02:31,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:02:32,196 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:32,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:33,048 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:33,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1144291311] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:33,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407806385] [2022-11-20 19:02:33,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:02:33,049 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:02:33,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:02:33,050 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:02:33,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Waiting until timeout for monitored process [2022-11-20 19:02:33,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:02:33,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-20 19:02:33,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:33,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:02:33,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:02:33,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:02:33,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 10 [2022-11-20 19:02:33,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-20 19:02:33,929 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 19:02:33,930 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:02:33,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407806385] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:02:33,930 INFO L184 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2022-11-20 19:02:33,930 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5, 5, 5] total 23 [2022-11-20 19:02:33,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20606135] [2022-11-20 19:02:33,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:02:33,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 19:02:33,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:02:33,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 19:02:33,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2022-11-20 19:02:33,932 INFO L87 Difference]: Start difference. First operand 4188 states and 17963 transitions. Second operand has 7 states, 6 states have (on average 2.0) 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) [2022-11-20 19:02:34,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:02:34,773 INFO L93 Difference]: Finished difference Result 5725 states and 23750 transitions. [2022-11-20 19:02:34,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 19:02:34,774 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) 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 13 [2022-11-20 19:02:34,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:02:34,810 INFO L225 Difference]: With dead ends: 5725 [2022-11-20 19:02:34,811 INFO L226 Difference]: Without dead ends: 5725 [2022-11-20 19:02:34,811 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2022-11-20 19:02:34,812 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 118 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 19:02:34,812 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 16 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 19:02:34,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5725 states. [2022-11-20 19:02:34,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5725 to 3899. [2022-11-20 19:02:34,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3899 states, 3885 states have (on average 4.24967824967825) internal successors, (16510), 3898 states have internal predecessors, (16510), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:35,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3899 states to 3899 states and 16510 transitions. [2022-11-20 19:02:35,000 INFO L78 Accepts]: Start accepts. Automaton has 3899 states and 16510 transitions. Word has length 13 [2022-11-20 19:02:35,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:02:35,000 INFO L495 AbstractCegarLoop]: Abstraction has 3899 states and 16510 transitions. [2022-11-20 19:02:35,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) 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) [2022-11-20 19:02:35,000 INFO L276 IsEmpty]: Start isEmpty. Operand 3899 states and 16510 transitions. [2022-11-20 19:02:35,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:02:35,002 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:02:35,002 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:02:35,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (142)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:35,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (141)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:35,409 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Ended with exit code 0 [2022-11-20 19:02:35,603 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 142 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,143 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:02:35,603 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:02:35,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:02:35,603 INFO L85 PathProgramCache]: Analyzing trace with hash 936694818, now seen corresponding path program 2 times [2022-11-20 19:02:35,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:02:35,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [365176943] [2022-11-20 19:02:35,604 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:02:35,604 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:02:35,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:02:35,605 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:02:35,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (144)] Waiting until timeout for monitored process [2022-11-20 19:02:35,974 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:02:35,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:02:35,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 19:02:35,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:36,130 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 19:02:36,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 19:02:36,328 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:36,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:37,122 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:37,122 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:02:37,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [365176943] [2022-11-20 19:02:37,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [365176943] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:37,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1954302212] [2022-11-20 19:02:37,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:02:37,123 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:02:37,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:02:37,124 INFO L229 MonitoredProcess]: Starting monitored process 145 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:02:37,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (145)] Waiting until timeout for monitored process [2022-11-20 19:02:37,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:02:37,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:02:37,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 19:02:37,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:38,038 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:02:38,038 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:02:38,284 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 19:02:38,822 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:38,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:39,706 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:39,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1954302212] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:39,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427941763] [2022-11-20 19:02:39,707 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:02:39,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:02:39,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:02:39,708 INFO L229 MonitoredProcess]: Starting monitored process 146 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:02:39,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Waiting until timeout for monitored process [2022-11-20 19:02:40,105 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:02:40,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:02:40,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:02:40,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:40,260 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:02:40,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:02:41,094 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:41,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:42,081 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:42,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1427941763] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:42,081 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:02:42,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 19:02:42,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912368498] [2022-11-20 19:02:42,081 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:02:42,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 19:02:42,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:02:42,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 19:02:42,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:02:42,083 INFO L87 Difference]: Start difference. First operand 3899 states and 16510 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:44,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:02:44,829 INFO L93 Difference]: Finished difference Result 4006 states and 16874 transitions. [2022-11-20 19:02:44,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-20 19:02:44,830 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:02:44,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:02:44,842 INFO L225 Difference]: With dead ends: 4006 [2022-11-20 19:02:44,842 INFO L226 Difference]: Without dead ends: 4006 [2022-11-20 19:02:44,842 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=255, Invalid=1637, Unknown=0, NotChecked=0, Total=1892 [2022-11-20 19:02:44,843 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 212 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 230 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-20 19:02:44,843 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 129 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 387 Invalid, 0 Unknown, 230 Unchecked, 1.8s Time] [2022-11-20 19:02:44,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4006 states. [2022-11-20 19:02:44,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4006 to 3909. [2022-11-20 19:02:44,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3909 states, 3895 states have (on average 4.2490372272143775) internal successors, (16550), 3908 states have internal predecessors, (16550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:44,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3909 states to 3909 states and 16550 transitions. [2022-11-20 19:02:44,927 INFO L78 Accepts]: Start accepts. Automaton has 3909 states and 16550 transitions. Word has length 13 [2022-11-20 19:02:44,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:02:44,928 INFO L495 AbstractCegarLoop]: Abstraction has 3909 states and 16550 transitions. [2022-11-20 19:02:44,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:44,928 INFO L276 IsEmpty]: Start isEmpty. Operand 3909 states and 16550 transitions. [2022-11-20 19:02:44,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:02:44,930 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:02:44,930 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:02:44,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (145)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:45,148 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (144)] Ended with exit code 0 [2022-11-20 19:02:45,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:45,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 145 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,144 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,146 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:02:45,538 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:02:45,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:02:45,539 INFO L85 PathProgramCache]: Analyzing trace with hash 932494287, now seen corresponding path program 2 times [2022-11-20 19:02:45,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:02:45,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [656117032] [2022-11-20 19:02:45,539 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:02:45,539 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:02:45,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:02:45,540 INFO L229 MonitoredProcess]: Starting monitored process 147 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:02:45,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (147)] Waiting until timeout for monitored process [2022-11-20 19:02:45,940 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:02:45,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:02:45,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 19:02:45,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:46,098 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 19:02:46,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 19:02:46,259 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:46,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:47,033 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:47,033 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:02:47,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [656117032] [2022-11-20 19:02:47,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [656117032] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:47,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [990482460] [2022-11-20 19:02:47,034 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:02:47,034 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:02:47,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:02:47,035 INFO L229 MonitoredProcess]: Starting monitored process 148 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:02:47,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (148)] Waiting until timeout for monitored process [2022-11-20 19:02:47,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:02:47,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:02:47,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 19:02:47,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:47,950 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:02:47,950 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:02:48,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 19:02:48,684 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:48,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:49,552 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:49,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [990482460] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:49,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823295033] [2022-11-20 19:02:49,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:02:49,553 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:02:49,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:02:49,554 INFO L229 MonitoredProcess]: Starting monitored process 149 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:02:49,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Waiting until timeout for monitored process [2022-11-20 19:02:50,013 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:02:50,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:02:50,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:02:50,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:50,191 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:02:50,192 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:02:51,103 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:51,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:52,134 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:52,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823295033] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:52,135 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:02:52,135 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 19:02:52,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316110240] [2022-11-20 19:02:52,135 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:02:52,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 19:02:52,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:02:52,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 19:02:52,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:02:52,137 INFO L87 Difference]: Start difference. First operand 3909 states and 16550 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:55,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:02:55,968 INFO L93 Difference]: Finished difference Result 4010 states and 16936 transitions. [2022-11-20 19:02:55,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 19:02:55,970 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:02:55,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:02:55,985 INFO L225 Difference]: With dead ends: 4010 [2022-11-20 19:02:55,985 INFO L226 Difference]: Without dead ends: 4010 [2022-11-20 19:02:55,985 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=274, Invalid=1706, Unknown=0, NotChecked=0, Total=1980 [2022-11-20 19:02:55,986 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 179 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 801 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 228 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-20 19:02:55,986 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [179 Valid, 109 Invalid, 801 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 566 Invalid, 0 Unknown, 228 Unchecked, 2.7s Time] [2022-11-20 19:02:55,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4010 states. [2022-11-20 19:02:56,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4010 to 3919. [2022-11-20 19:02:56,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3919 states, 3905 states have (on average 4.250960307298335) internal successors, (16600), 3918 states have internal predecessors, (16600), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:56,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3919 states to 3919 states and 16600 transitions. [2022-11-20 19:02:56,125 INFO L78 Accepts]: Start accepts. Automaton has 3919 states and 16600 transitions. Word has length 13 [2022-11-20 19:02:56,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:02:56,126 INFO L495 AbstractCegarLoop]: Abstraction has 3919 states and 16600 transitions. [2022-11-20 19:02:56,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:02:56,126 INFO L276 IsEmpty]: Start isEmpty. Operand 3919 states and 16600 transitions. [2022-11-20 19:02:56,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 19:02:56,129 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:02:56,129 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:02:56,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Forceful destruction successful, exit code 0 [2022-11-20 19:02:56,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (148)] Ended with exit code 0 [2022-11-20 19:02:56,546 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (147)] Ended with exit code 0 [2022-11-20 19:02:56,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 149 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,148 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,147 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:02:56,738 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:02:56,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:02:56,739 INFO L85 PathProgramCache]: Analyzing trace with hash 932226168, now seen corresponding path program 3 times [2022-11-20 19:02:56,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:02:56,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1118978832] [2022-11-20 19:02:56,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:02:56,739 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:02:56,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:02:56,740 INFO L229 MonitoredProcess]: Starting monitored process 150 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:02:56,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (150)] Waiting until timeout for monitored process [2022-11-20 19:02:57,123 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 19:02:57,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:02:57,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 19:02:57,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:57,325 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-20 19:02:57,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 42 [2022-11-20 19:02:57,544 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:57,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:02:58,380 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:02:58,381 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:02:58,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1118978832] [2022-11-20 19:02:58,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1118978832] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:02:58,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1331026665] [2022-11-20 19:02:58,381 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:02:58,381 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:02:58,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:02:58,382 INFO L229 MonitoredProcess]: Starting monitored process 151 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:02:58,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (151)] Waiting until timeout for monitored process [2022-11-20 19:02:59,148 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 19:02:59,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:02:59,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 19:02:59,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:02:59,339 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:02:59,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:02:59,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2022-11-20 19:03:00,064 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:00,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:03:00,944 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:00,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1331026665] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:03:00,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [815278275] [2022-11-20 19:03:00,945 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:03:00,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:03:00,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:03:00,946 INFO L229 MonitoredProcess]: Starting monitored process 152 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:03:00,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Waiting until timeout for monitored process [2022-11-20 19:03:01,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 19:03:01,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:03:01,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:03:01,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:03:01,526 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:03:01,527 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:03:02,324 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:02,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:03:03,293 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:03,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [815278275] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:03:03,294 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:03:03,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 19:03:03,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944045673] [2022-11-20 19:03:03,294 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:03:03,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 19:03:03,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:03:03,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 19:03:03,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:03:03,295 INFO L87 Difference]: Start difference. First operand 3919 states and 16600 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:03:08,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:03:08,633 INFO L93 Difference]: Finished difference Result 5600 states and 23660 transitions. [2022-11-20 19:03:08,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 19:03:08,634 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 19:03:08,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:03:08,655 INFO L225 Difference]: With dead ends: 5600 [2022-11-20 19:03:08,655 INFO L226 Difference]: Without dead ends: 5600 [2022-11-20 19:03:08,655 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=274, Invalid=1706, Unknown=0, NotChecked=0, Total=1980 [2022-11-20 19:03:08,656 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 405 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 959 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 405 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 1768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 803 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:03:08,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [405 Valid, 154 Invalid, 1768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 959 Invalid, 0 Unknown, 803 Unchecked, 4.2s Time] [2022-11-20 19:03:08,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5600 states. [2022-11-20 19:03:08,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5600 to 3810. [2022-11-20 19:03:08,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3810 states, 3796 states have (on average 4.232876712328767) internal successors, (16068), 3809 states have internal predecessors, (16068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:03:08,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3810 states to 3810 states and 16068 transitions. [2022-11-20 19:03:08,770 INFO L78 Accepts]: Start accepts. Automaton has 3810 states and 16068 transitions. Word has length 13 [2022-11-20 19:03:08,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:03:08,770 INFO L495 AbstractCegarLoop]: Abstraction has 3810 states and 16068 transitions. [2022-11-20 19:03:08,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:03:08,770 INFO L276 IsEmpty]: Start isEmpty. Operand 3810 states and 16068 transitions. [2022-11-20 19:03:08,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 19:03:08,772 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:03:08,773 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:03:08,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (151)] Forceful destruction successful, exit code 0 [2022-11-20 19:03:08,986 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Ended with exit code 0 [2022-11-20 19:03:09,195 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (150)] Ended with exit code 0 [2022-11-20 19:03:09,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 151 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,152 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,150 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:03:09,380 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:03:09,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:03:09,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1706944156, now seen corresponding path program 4 times [2022-11-20 19:03:09,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:03:09,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [401998924] [2022-11-20 19:03:09,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:03:09,381 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:03:09,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:03:09,382 INFO L229 MonitoredProcess]: Starting monitored process 153 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:03:09,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (153)] Waiting until timeout for monitored process [2022-11-20 19:03:09,739 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:03:09,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:03:09,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 19:03:09,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:03:10,020 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:10,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:03:10,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:03:11,253 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:11,253 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:03:11,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [401998924] [2022-11-20 19:03:11,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [401998924] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:03:11,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [391053667] [2022-11-20 19:03:11,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:03:11,254 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:03:11,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:03:11,255 INFO L229 MonitoredProcess]: Starting monitored process 154 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:03:11,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (154)] Waiting until timeout for monitored process [2022-11-20 19:03:11,925 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:03:11,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:03:11,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:03:11,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:03:12,079 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:03:12,079 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:03:12,970 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:12,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:03:14,411 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:14,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [391053667] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:03:14,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761587844] [2022-11-20 19:03:14,412 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:03:14,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:03:14,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:03:14,413 INFO L229 MonitoredProcess]: Starting monitored process 155 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:03:14,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (155)] Waiting until timeout for monitored process [2022-11-20 19:03:14,835 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:03:14,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:03:14,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:03:14,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:03:14,993 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:03:14,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:03:16,286 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:16,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:03:17,524 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:17,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1761587844] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:03:17,524 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:03:17,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 45 [2022-11-20 19:03:17,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899466439] [2022-11-20 19:03:17,525 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:03:17,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-20 19:03:17,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:03:17,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-20 19:03:17,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1872, Unknown=0, NotChecked=0, Total=2162 [2022-11-20 19:03:17,526 INFO L87 Difference]: Start difference. First operand 3810 states and 16068 transitions. Second operand has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 46 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:03:52,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:03:52,667 INFO L93 Difference]: Finished difference Result 10770 states and 41965 transitions. [2022-11-20 19:03:52,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-20 19:03:52,670 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 46 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 19:03:52,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:03:52,697 INFO L225 Difference]: With dead ends: 10770 [2022-11-20 19:03:52,697 INFO L226 Difference]: Without dead ends: 10770 [2022-11-20 19:03:52,698 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 35 SyntacticMatches, 6 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1990 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=715, Invalid=4985, Unknown=0, NotChecked=0, Total=5700 [2022-11-20 19:03:52,698 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 1443 mSDsluCounter, 498 mSDsCounter, 0 mSdLazyCounter, 2963 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1443 SdHoareTripleChecker+Valid, 518 SdHoareTripleChecker+Invalid, 3371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 2963 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 395 IncrementalHoareTripleChecker+Unchecked, 21.4s IncrementalHoareTripleChecker+Time [2022-11-20 19:03:52,698 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1443 Valid, 518 Invalid, 3371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 2963 Invalid, 0 Unknown, 395 Unchecked, 21.4s Time] [2022-11-20 19:03:52,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10770 states. [2022-11-20 19:03:52,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10770 to 4329. [2022-11-20 19:03:52,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4329 states, 4315 states have (on average 4.3068366164542295) internal successors, (18584), 4328 states have internal predecessors, (18584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:03:52,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4329 states to 4329 states and 18584 transitions. [2022-11-20 19:03:52,883 INFO L78 Accepts]: Start accepts. Automaton has 4329 states and 18584 transitions. Word has length 14 [2022-11-20 19:03:52,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:03:52,883 INFO L495 AbstractCegarLoop]: Abstraction has 4329 states and 18584 transitions. [2022-11-20 19:03:52,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 46 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:03:52,884 INFO L276 IsEmpty]: Start isEmpty. Operand 4329 states and 18584 transitions. [2022-11-20 19:03:52,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 19:03:52,885 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:03:52,886 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:03:52,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (155)] Forceful destruction successful, exit code 0 [2022-11-20 19:03:53,091 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (154)] Ended with exit code 0 [2022-11-20 19:03:53,297 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (153)] Ended with exit code 0 [2022-11-20 19:03:53,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 155 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,154 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,153 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:03:53,487 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:03:53,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:03:53,487 INFO L85 PathProgramCache]: Analyzing trace with hash -1873177936, now seen corresponding path program 5 times [2022-11-20 19:03:53,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:03:53,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1178505892] [2022-11-20 19:03:53,488 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-20 19:03:53,488 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:03:53,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:03:53,489 INFO L229 MonitoredProcess]: Starting monitored process 156 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:03:53,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (156)] Waiting until timeout for monitored process [2022-11-20 19:03:53,919 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2022-11-20 19:03:53,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:03:53,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 19:03:53,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:03:54,191 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:54,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:03:54,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:03:55,552 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:55,553 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:03:55,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1178505892] [2022-11-20 19:03:55,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1178505892] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:03:55,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1770265965] [2022-11-20 19:03:55,553 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-20 19:03:55,553 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:03:55,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:03:55,554 INFO L229 MonitoredProcess]: Starting monitored process 157 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:03:55,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (157)] Waiting until timeout for monitored process [2022-11-20 19:03:56,439 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2022-11-20 19:03:56,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:03:56,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:03:56,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:03:56,583 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:03:56,583 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:03:57,687 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:57,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:03:59,369 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:03:59,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1770265965] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:03:59,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756158989] [2022-11-20 19:03:59,370 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-20 19:03:59,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:03:59,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:03:59,371 INFO L229 MonitoredProcess]: Starting monitored process 158 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:03:59,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (158)] Waiting until timeout for monitored process [2022-11-20 19:04:00,143 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2022-11-20 19:04:00,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:04:00,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:04:00,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:04:00,293 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:04:00,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:04:01,578 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:04:01,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:04:02,740 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:04:02,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756158989] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:04:02,741 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:04:02,741 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 45 [2022-11-20 19:04:02,741 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503189487] [2022-11-20 19:04:02,741 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:04:02,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-20 19:04:02,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:04:02,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-20 19:04:02,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1872, Unknown=0, NotChecked=0, Total=2162 [2022-11-20 19:04:02,742 INFO L87 Difference]: Start difference. First operand 4329 states and 18584 transitions. Second operand has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 46 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:04:09,378 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 19:04:25,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:04:25,100 INFO L93 Difference]: Finished difference Result 12053 states and 47175 transitions. [2022-11-20 19:04:25,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-20 19:04:25,101 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 46 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 19:04:25,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:04:25,133 INFO L225 Difference]: With dead ends: 12053 [2022-11-20 19:04:25,133 INFO L226 Difference]: Without dead ends: 12053 [2022-11-20 19:04:25,134 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1730 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=889, Invalid=4811, Unknown=0, NotChecked=0, Total=5700 [2022-11-20 19:04:25,134 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 3297 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 2170 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3297 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 3538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 2170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1352 IncrementalHoareTripleChecker+Unchecked, 16.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:04:25,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3297 Valid, 393 Invalid, 3538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 2170 Invalid, 0 Unknown, 1352 Unchecked, 16.1s Time] [2022-11-20 19:04:25,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12053 states. [2022-11-20 19:04:25,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12053 to 4540. [2022-11-20 19:04:25,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4540 states, 4526 states have (on average 4.339593460008838) internal successors, (19641), 4539 states have internal predecessors, (19641), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:04:25,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4540 states to 4540 states and 19641 transitions. [2022-11-20 19:04:25,343 INFO L78 Accepts]: Start accepts. Automaton has 4540 states and 19641 transitions. Word has length 14 [2022-11-20 19:04:25,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:04:25,343 INFO L495 AbstractCegarLoop]: Abstraction has 4540 states and 19641 transitions. [2022-11-20 19:04:25,343 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 46 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:04:25,343 INFO L276 IsEmpty]: Start isEmpty. Operand 4540 states and 19641 transitions. [2022-11-20 19:04:25,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 19:04:25,345 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:04:25,345 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1, 1] [2022-11-20 19:04:25,351 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (157)] Ended with exit code 0 [2022-11-20 19:04:25,554 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (156)] Ended with exit code 0 [2022-11-20 19:04:25,753 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (158)] Ended with exit code 0 [2022-11-20 19:04:25,946 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 157 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,156 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,158 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:04:25,946 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:04:25,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:04:25,947 INFO L85 PathProgramCache]: Analyzing trace with hash 1670220411, now seen corresponding path program 1 times [2022-11-20 19:04:25,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:04:25,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [871292360] [2022-11-20 19:04:25,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:04:25,947 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:04:25,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:04:25,948 INFO L229 MonitoredProcess]: Starting monitored process 159 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:04:25,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (159)] Waiting until timeout for monitored process [2022-11-20 19:04:26,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:04:26,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-20 19:04:26,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:04:26,606 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:04:26,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:04:27,221 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:04:27,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:04:29,628 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:04:29,628 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:04:29,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [871292360] [2022-11-20 19:04:29,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [871292360] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:04:29,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [4071702] [2022-11-20 19:04:29,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:04:29,628 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:04:29,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:04:29,635 INFO L229 MonitoredProcess]: Starting monitored process 160 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:04:29,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (160)] Waiting until timeout for monitored process [2022-11-20 19:04:30,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:04:30,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 19:04:30,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:04:31,274 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:04:31,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:04:32,795 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:04:32,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [4071702] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:04:32,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638744612] [2022-11-20 19:04:32,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:04:32,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:04:32,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:04:32,797 INFO L229 MonitoredProcess]: Starting monitored process 161 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:04:32,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (161)] Waiting until timeout for monitored process [2022-11-20 19:04:33,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:04:33,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 19:04:33,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:04:33,790 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:04:33,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:04:33,854 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:04:33,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638744612] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:04:33,854 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:04:33,854 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10, 10, 10, 10] total 44 [2022-11-20 19:04:33,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051078522] [2022-11-20 19:04:33,854 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:04:33,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-20 19:04:33,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:04:33,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-20 19:04:33,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=1626, Unknown=0, NotChecked=0, Total=1980 [2022-11-20 19:04:33,855 INFO L87 Difference]: Start difference. First operand 4540 states and 19641 transitions. Second operand has 45 states, 45 states have (on average 1.288888888888889) internal successors, (58), 44 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:05:10,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:05:10,418 INFO L93 Difference]: Finished difference Result 6760 states and 26640 transitions. [2022-11-20 19:05:10,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-20 19:05:10,422 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.288888888888889) internal successors, (58), 44 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 19:05:10,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:05:10,442 INFO L225 Difference]: With dead ends: 6760 [2022-11-20 19:05:10,442 INFO L226 Difference]: Without dead ends: 6760 [2022-11-20 19:05:10,443 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1496 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=1103, Invalid=4749, Unknown=0, NotChecked=0, Total=5852 [2022-11-20 19:05:10,443 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 1673 mSDsluCounter, 740 mSDsCounter, 0 mSdLazyCounter, 5291 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1673 SdHoareTripleChecker+Valid, 777 SdHoareTripleChecker+Invalid, 5344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 5291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:05:10,443 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1673 Valid, 777 Invalid, 5344 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [53 Valid, 5291 Invalid, 0 Unknown, 0 Unchecked, 21.2s Time] [2022-11-20 19:05:10,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6760 states. [2022-11-20 19:05:10,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6760 to 4281. [2022-11-20 19:05:10,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4281 states, 4267 states have (on average 4.234356690883525) internal successors, (18068), 4280 states have internal predecessors, (18068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:05:10,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4281 states to 4281 states and 18068 transitions. [2022-11-20 19:05:10,577 INFO L78 Accepts]: Start accepts. Automaton has 4281 states and 18068 transitions. Word has length 14 [2022-11-20 19:05:10,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:05:10,577 INFO L495 AbstractCegarLoop]: Abstraction has 4281 states and 18068 transitions. [2022-11-20 19:05:10,577 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.288888888888889) internal successors, (58), 44 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:05:10,577 INFO L276 IsEmpty]: Start isEmpty. Operand 4281 states and 18068 transitions. [2022-11-20 19:05:10,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 19:05:10,579 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:05:10,579 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:05:10,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (161)] Ended with exit code 0 [2022-11-20 19:05:10,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (160)] Forceful destruction successful, exit code 0 [2022-11-20 19:05:10,990 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (159)] Ended with exit code 0 [2022-11-20 19:05:11,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 161 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,160 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,159 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:05:11,180 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:05:11,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:05:11,181 INFO L85 PathProgramCache]: Analyzing trace with hash -2091453204, now seen corresponding path program 3 times [2022-11-20 19:05:11,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:05:11,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1589638795] [2022-11-20 19:05:11,181 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:05:11,181 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:05:11,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:05:11,182 INFO L229 MonitoredProcess]: Starting monitored process 162 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:05:11,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (162)] Waiting until timeout for monitored process [2022-11-20 19:05:11,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 19:05:11,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:05:11,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 19:05:11,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:05:11,745 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:05:11,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:05:12,144 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 19:05:12,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:05:13,897 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 19:05:13,897 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:05:13,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1589638795] [2022-11-20 19:05:13,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1589638795] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:05:13,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [549325027] [2022-11-20 19:05:13,897 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:05:13,898 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:05:13,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:05:13,899 INFO L229 MonitoredProcess]: Starting monitored process 163 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:05:13,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (163)] Waiting until timeout for monitored process [2022-11-20 19:05:14,710 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 19:05:14,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:05:14,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-20 19:05:14,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:05:14,881 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:05:14,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:05:15,191 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 10 [2022-11-20 19:05:15,202 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-20 19:05:15,381 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 19:05:15,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:05:15,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-20 19:05:15,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 9 [2022-11-20 19:05:15,479 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-20 19:05:18,485 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 19:05:18,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [549325027] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:05:18,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853377205] [2022-11-20 19:05:18,486 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:05:18,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:05:18,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:05:18,487 INFO L229 MonitoredProcess]: Starting monitored process 164 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:05:18,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (164)] Waiting until timeout for monitored process [2022-11-20 19:05:19,007 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-20 19:05:19,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:05:19,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 19:05:19,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:05:19,166 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:05:19,167 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:05:19,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 234 treesize of output 90 [2022-11-20 19:05:19,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-20 19:05:19,860 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 19:05:19,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:05:20,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-20 19:05:20,530 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-20 19:05:23,875 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 19:05:23,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853377205] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:05:23,875 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:05:23,875 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 20 [2022-11-20 19:05:23,875 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556956916] [2022-11-20 19:05:23,875 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:05:23,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-20 19:05:23,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:05:23,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-20 19:05:23,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2022-11-20 19:05:23,876 INFO L87 Difference]: Start difference. First operand 4281 states and 18068 transitions. Second operand has 22 states, 21 states have (on average 2.380952380952381) internal successors, (50), 21 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:05:27,616 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 19:05:30,056 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2022-11-20 19:05:30,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:05:30,797 INFO L93 Difference]: Finished difference Result 4692 states and 19560 transitions. [2022-11-20 19:05:30,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 19:05:30,798 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.380952380952381) internal successors, (50), 21 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 19:05:30,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:05:30,809 INFO L225 Difference]: With dead ends: 4692 [2022-11-20 19:05:30,809 INFO L226 Difference]: Without dead ends: 4692 [2022-11-20 19:05:30,810 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=177, Invalid=525, Unknown=0, NotChecked=0, Total=702 [2022-11-20 19:05:30,810 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 262 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 12 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:05:30,810 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 28 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 258 Invalid, 2 Unknown, 0 Unchecked, 6.2s Time] [2022-11-20 19:05:30,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4692 states. [2022-11-20 19:05:30,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4692 to 3101. [2022-11-20 19:05:30,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3101 states, 3093 states have (on average 4.096023278370514) internal successors, (12669), 3100 states have internal predecessors, (12669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:05:30,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3101 states to 3101 states and 12669 transitions. [2022-11-20 19:05:30,900 INFO L78 Accepts]: Start accepts. Automaton has 3101 states and 12669 transitions. Word has length 14 [2022-11-20 19:05:30,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:05:30,900 INFO L495 AbstractCegarLoop]: Abstraction has 3101 states and 12669 transitions. [2022-11-20 19:05:30,900 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.380952380952381) internal successors, (50), 21 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:05:30,900 INFO L276 IsEmpty]: Start isEmpty. Operand 3101 states and 12669 transitions. [2022-11-20 19:05:30,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 19:05:30,902 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:05:30,902 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:05:30,911 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (162)] Ended with exit code 0 [2022-11-20 19:05:31,109 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (164)] Ended with exit code 0 [2022-11-20 19:05:31,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (163)] Forceful destruction successful, exit code 0 [2022-11-20 19:05:31,503 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 162 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,164 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,163 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 19:05:31,503 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:05:31,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:05:31,504 INFO L85 PathProgramCache]: Analyzing trace with hash 324786540, now seen corresponding path program 1 times [2022-11-20 19:05:31,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:05:31,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1226031793] [2022-11-20 19:05:31,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:05:31,505 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:05:31,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:05:31,506 INFO L229 MonitoredProcess]: Starting monitored process 165 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:05:31,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (165)] Waiting until timeout for monitored process [2022-11-20 19:05:31,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:05:31,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:05:31,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:05:32,110 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:32,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:05:32,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:05:32,876 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:32,876 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:05:32,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1226031793] [2022-11-20 19:05:32,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1226031793] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:05:32,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2014921368] [2022-11-20 19:05:32,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:05:32,877 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:05:32,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:05:32,879 INFO L229 MonitoredProcess]: Starting monitored process 166 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:05:32,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (166)] Waiting until timeout for monitored process [2022-11-20 19:05:33,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:05:33,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 19:05:33,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:05:34,127 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:34,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:05:34,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:34,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2014921368] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:05:34,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417436224] [2022-11-20 19:05:34,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:05:34,960 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:05:34,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:05:34,967 INFO L229 MonitoredProcess]: Starting monitored process 167 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:05:34,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (167)] Waiting until timeout for monitored process [2022-11-20 19:05:35,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:05:35,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:05:35,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:05:35,577 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:05:35,577 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:05:36,469 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:36,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:05:37,497 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:37,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417436224] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:05:37,497 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:05:37,497 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 33 [2022-11-20 19:05:37,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932931450] [2022-11-20 19:05:37,497 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:05:37,498 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 19:05:37,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:05:37,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 19:05:37,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 19:05:37,498 INFO L87 Difference]: Start difference. First operand 3101 states and 12669 transitions. Second operand has 35 states, 34 states have (on average 2.176470588235294) internal successors, (74), 34 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:05:43,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:05:43,880 INFO L93 Difference]: Finished difference Result 4662 states and 19221 transitions. [2022-11-20 19:05:43,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-20 19:05:43,882 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.176470588235294) internal successors, (74), 34 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 19:05:43,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:05:43,896 INFO L225 Difference]: With dead ends: 4662 [2022-11-20 19:05:43,896 INFO L226 Difference]: Without dead ends: 4662 [2022-11-20 19:05:43,896 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=337, Invalid=2213, Unknown=0, NotChecked=0, Total=2550 [2022-11-20 19:05:43,896 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 221 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 1120 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 1306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 177 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-20 19:05:43,897 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 158 Invalid, 1306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1120 Invalid, 0 Unknown, 177 Unchecked, 4.4s Time] [2022-11-20 19:05:43,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4662 states. [2022-11-20 19:05:43,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4662 to 3112. [2022-11-20 19:05:43,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3112 states, 3104 states have (on average 4.101159793814433) internal successors, (12730), 3111 states have internal predecessors, (12730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:05:44,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3112 states to 3112 states and 12730 transitions. [2022-11-20 19:05:44,029 INFO L78 Accepts]: Start accepts. Automaton has 3112 states and 12730 transitions. Word has length 14 [2022-11-20 19:05:44,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:05:44,029 INFO L495 AbstractCegarLoop]: Abstraction has 3112 states and 12730 transitions. [2022-11-20 19:05:44,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.176470588235294) internal successors, (74), 34 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:05:44,029 INFO L276 IsEmpty]: Start isEmpty. Operand 3112 states and 12730 transitions. [2022-11-20 19:05:44,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 19:05:44,032 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:05:44,032 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:05:44,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (166)] Forceful destruction successful, exit code 0 [2022-11-20 19:05:44,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (167)] Forceful destruction successful, exit code 0 [2022-11-20 19:05:44,441 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (165)] Ended with exit code 0 [2022-11-20 19:05:44,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 166 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,167 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,165 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:05:44,633 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:05:44,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:05:44,634 INFO L85 PathProgramCache]: Analyzing trace with hash 324791128, now seen corresponding path program 7 times [2022-11-20 19:05:44,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:05:44,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1803146572] [2022-11-20 19:05:44,634 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 19:05:44,634 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:05:44,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:05:44,635 INFO L229 MonitoredProcess]: Starting monitored process 168 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:05:44,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (168)] Waiting until timeout for monitored process [2022-11-20 19:05:45,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:05:45,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:05:45,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:05:45,219 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:45,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:05:45,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2022-11-20 19:05:45,905 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:45,905 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:05:45,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1803146572] [2022-11-20 19:05:45,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1803146572] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:05:45,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [263132905] [2022-11-20 19:05:45,906 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 19:05:45,906 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:05:45,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:05:45,907 INFO L229 MonitoredProcess]: Starting monitored process 169 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:05:45,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (169)] Waiting until timeout for monitored process [2022-11-20 19:05:46,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:05:46,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 19:05:46,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:05:47,169 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:47,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:05:48,031 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:05:48,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [263132905] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:05:48,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103603124] [2022-11-20 19:05:48,032 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 19:05:48,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:05:48,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:05:48,033 INFO L229 MonitoredProcess]: Starting monitored process 170 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:05:48,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (170)] Waiting until timeout for monitored process [2022-11-20 19:05:48,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:05:48,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 19:05:48,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:05:49,080 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-20 19:05:49,110 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 19:05:49,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:05:49,180 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 19:05:49,180 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 156 treesize of output 86 [2022-11-20 19:05:49,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 86 treesize of output 82 [2022-11-20 19:05:49,207 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 100 [2022-11-20 19:05:51,239 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 19:05:51,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103603124] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:05:51,239 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:05:51,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 7, 6] total 35 [2022-11-20 19:05:51,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071461790] [2022-11-20 19:05:51,240 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:05:51,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-20 19:05:51,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:05:51,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-20 19:05:51,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1141, Unknown=0, NotChecked=0, Total=1260 [2022-11-20 19:05:51,241 INFO L87 Difference]: Start difference. First operand 3112 states and 12730 transitions. Second operand has 36 states, 35 states have (on average 2.2857142857142856) internal successors, (80), 36 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:07:00,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:07:00,092 INFO L93 Difference]: Finished difference Result 11238 states and 40836 transitions. [2022-11-20 19:07:00,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 176 states. [2022-11-20 19:07:00,094 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.2857142857142856) internal successors, (80), 36 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 19:07:00,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:07:00,127 INFO L225 Difference]: With dead ends: 11238 [2022-11-20 19:07:00,127 INFO L226 Difference]: Without dead ends: 11238 [2022-11-20 19:07:00,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15852 ImplicationChecksByTransitivity, 53.8s TimeCoverageRelationStatistics Valid=5966, Invalid=37924, Unknown=0, NotChecked=0, Total=43890 [2022-11-20 19:07:00,129 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 3882 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 5458 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3882 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 7071 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 5458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1504 IncrementalHoareTripleChecker+Unchecked, 18.5s IncrementalHoareTripleChecker+Time [2022-11-20 19:07:00,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3882 Valid, 277 Invalid, 7071 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [109 Valid, 5458 Invalid, 0 Unknown, 1504 Unchecked, 18.5s Time] [2022-11-20 19:07:00,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11238 states. [2022-11-20 19:07:00,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11238 to 2516. [2022-11-20 19:07:00,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2516 states, 2508 states have (on average 4.054625199362041) internal successors, (10169), 2515 states have internal predecessors, (10169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:07:00,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2516 states to 2516 states and 10169 transitions. [2022-11-20 19:07:00,313 INFO L78 Accepts]: Start accepts. Automaton has 2516 states and 10169 transitions. Word has length 14 [2022-11-20 19:07:00,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:07:00,314 INFO L495 AbstractCegarLoop]: Abstraction has 2516 states and 10169 transitions. [2022-11-20 19:07:00,314 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.2857142857142856) internal successors, (80), 36 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:07:00,314 INFO L276 IsEmpty]: Start isEmpty. Operand 2516 states and 10169 transitions. [2022-11-20 19:07:00,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 19:07:00,316 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:07:00,316 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:07:00,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (168)] Forceful destruction successful, exit code 0 [2022-11-20 19:07:00,539 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (169)] Ended with exit code 0 [2022-11-20 19:07:00,741 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (170)] Ended with exit code 0 [2022-11-20 19:07:00,933 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 168 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,169 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,170 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:07:00,933 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:07:00,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:07:00,934 INFO L85 PathProgramCache]: Analyzing trace with hash -1442540992, now seen corresponding path program 1 times [2022-11-20 19:07:00,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:07:00,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1799966184] [2022-11-20 19:07:00,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:07:00,935 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:07:00,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:07:00,936 INFO L229 MonitoredProcess]: Starting monitored process 171 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:07:00,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (171)] Waiting until timeout for monitored process [2022-11-20 19:07:01,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:07:01,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 19:07:01,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:07:01,403 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 19:07:01,403 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:07:01,404 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:07:01,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1799966184] [2022-11-20 19:07:01,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1799966184] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:07:01,404 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:07:01,404 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 19:07:01,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598611047] [2022-11-20 19:07:01,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:07:01,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 19:07:01,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:07:01,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 19:07:01,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 19:07:01,405 INFO L87 Difference]: Start difference. First operand 2516 states and 10169 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 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) [2022-11-20 19:07:01,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:07:01,601 INFO L93 Difference]: Finished difference Result 2441 states and 9923 transitions. [2022-11-20 19:07:01,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:07:01,602 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 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 [2022-11-20 19:07:01,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:07:01,609 INFO L225 Difference]: With dead ends: 2441 [2022-11-20 19:07:01,609 INFO L226 Difference]: Without dead ends: 2441 [2022-11-20 19:07:01,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 19:07:01,610 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 40 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:07:01,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 3 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 19:07:01,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2441 states. [2022-11-20 19:07:01,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2441 to 2441. [2022-11-20 19:07:01,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2441 states, 2436 states have (on average 4.073481116584565) internal successors, (9923), 2440 states have internal predecessors, (9923), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:07:01,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2441 states to 2441 states and 9923 transitions. [2022-11-20 19:07:01,657 INFO L78 Accepts]: Start accepts. Automaton has 2441 states and 9923 transitions. Word has length 14 [2022-11-20 19:07:01,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:07:01,657 INFO L495 AbstractCegarLoop]: Abstraction has 2441 states and 9923 transitions. [2022-11-20 19:07:01,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 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) [2022-11-20 19:07:01,657 INFO L276 IsEmpty]: Start isEmpty. Operand 2441 states and 9923 transitions. [2022-11-20 19:07:01,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 19:07:01,659 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:07:01,659 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1] [2022-11-20 19:07:01,674 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (171)] Ended with exit code 0 [2022-11-20 19:07:01,859 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 171 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:07:01,859 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 40 more)] === [2022-11-20 19:07:01,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:07:01,860 INFO L85 PathProgramCache]: Analyzing trace with hash 919956732, now seen corresponding path program 4 times [2022-11-20 19:07:01,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:07:01,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1649820322] [2022-11-20 19:07:01,860 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:07:01,860 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:07:01,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:07:01,861 INFO L229 MonitoredProcess]: Starting monitored process 172 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:07:01,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (172)] Waiting until timeout for monitored process [2022-11-20 19:07:02,358 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:07:02,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:07:02,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:07:02,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:07:02,860 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:07:02,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:07:04,599 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 32 [2022-11-20 19:07:05,940 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 2 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:07:05,940 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:07:05,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1649820322] [2022-11-20 19:07:05,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1649820322] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:07:05,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1586119171] [2022-11-20 19:07:05,941 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:07:05,941 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:07:05,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:07:05,942 INFO L229 MonitoredProcess]: Starting monitored process 173 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:07:05,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (173)] Waiting until timeout for monitored process [2022-11-20 19:07:06,814 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:07:06,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:07:06,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 19:07:06,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:07:07,021 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:07:07,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:07:08,889 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:07:08,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:07:12,431 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:07:12,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1586119171] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:07:12,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264400612] [2022-11-20 19:07:12,431 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:07:12,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:07:12,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:07:12,432 INFO L229 MonitoredProcess]: Starting monitored process 174 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:07:12,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_731e8e14-5691-4103-95d3-0f4a7b510b66/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (174)] Waiting until timeout for monitored process [2022-11-20 19:07:12,953 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:07:12,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:07:12,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 19:07:12,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:07:13,141 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:07:13,142 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:07:17,411 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 10 [2022-11-20 19:07:17,420 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-20 19:07:17,716 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:07:17,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:07:17,781 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-20 19:07:17,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 9 [2022-11-20 19:07:17,821 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-20 19:07:24,784 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:07:24,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264400612] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:07:24,785 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:07:24,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 12, 12] total 69 [2022-11-20 19:07:24,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035017528] [2022-11-20 19:07:24,785 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:07:24,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-20 19:07:24,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:07:24,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-20 19:07:24,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=4451, Unknown=1, NotChecked=0, Total=4970 [2022-11-20 19:07:24,787 INFO L87 Difference]: Start difference. First operand 2441 states and 9923 transitions. Second operand has 71 states, 70 states have (on average 1.1714285714285715) internal successors, (82), 70 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)