./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a 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_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 082e5acb2a505af9e43ec1a894890509a127a32d8ecd4c5193a456bddcb0f4a3 --- 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-38b53e6 [2022-11-25 23:33:45,851 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:33:45,853 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:33:45,874 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:33:45,874 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:33:45,876 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:33:45,877 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:33:45,879 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:33:45,881 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:33:45,882 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:33:45,883 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:33:45,885 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:33:45,885 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:33:45,887 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:33:45,888 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:33:45,890 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:33:45,891 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:33:45,892 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:33:45,895 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:33:45,897 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:33:45,899 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:33:45,901 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:33:45,902 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:33:45,903 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:33:45,907 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:33:45,908 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:33:45,908 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:33:45,909 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:33:45,910 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:33:45,911 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:33:45,911 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:33:45,913 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:33:45,914 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:33:45,915 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:33:45,916 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:33:45,917 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:33:45,918 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:33:45,918 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:33:45,919 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:33:45,920 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:33:45,921 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:33:45,924 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:33:45,968 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:33:45,968 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:33:45,969 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:33:45,969 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:33:45,970 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:33:45,971 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:33:45,971 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:33:45,971 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:33:45,972 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:33:45,972 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:33:45,973 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:33:45,973 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:33:45,974 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:33:45,974 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:33:45,974 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:33:45,975 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:33:45,975 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:33:45,975 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:33:45,976 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:33:45,977 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:33:45,977 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:33:45,977 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:33:45,978 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:33:45,978 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:33:45,978 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:33:45,979 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:33:45,979 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:33:45,979 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:33:45,980 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:33:45,980 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:33:45,980 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:33:45,981 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:33:45,981 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:33:45,981 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:33:45,982 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:33:45,982 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:33:45,982 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:33:45,983 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:33:45,984 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:33:45,984 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:33:45,984 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:33:45,985 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_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 082e5acb2a505af9e43ec1a894890509a127a32d8ecd4c5193a456bddcb0f4a3 [2022-11-25 23:33:46,320 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:33:46,368 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:33:46,371 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:33:46,373 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:33:46,373 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:33:46,375 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound5.c [2022-11-25 23:33:49,497 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:33:49,791 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:33:49,791 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound5.c [2022-11-25 23:33:49,797 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/data/5d63f08fe/2a80c5b2912547df8f05e88d610d7e3d/FLAG03480ec05 [2022-11-25 23:33:49,814 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/data/5d63f08fe/2a80c5b2912547df8f05e88d610d7e3d [2022-11-25 23:33:49,817 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:33:49,819 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:33:49,820 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:33:49,820 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:33:49,827 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:33:49,828 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:33:49" (1/1) ... [2022-11-25 23:33:49,830 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2051c132 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:49, skipping insertion in model container [2022-11-25 23:33:49,831 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:33:49" (1/1) ... [2022-11-25 23:33:49,840 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:33:49,860 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:33:50,000 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_ba02239d-66d1-4ff8-8bd8-4191be459de0/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound5.c[537,550] [2022-11-25 23:33:50,021 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:33:50,031 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:33:50,045 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_ba02239d-66d1-4ff8-8bd8-4191be459de0/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound5.c[537,550] [2022-11-25 23:33:50,053 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:33:50,066 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:33:50,066 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50 WrapperNode [2022-11-25 23:33:50,067 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:33:50,068 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:33:50,068 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:33:50,068 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:33:50,077 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,083 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,104 INFO L138 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2022-11-25 23:33:50,104 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:33:50,105 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:33:50,105 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:33:50,105 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:33:50,116 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,116 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,118 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,118 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,122 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,126 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,127 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,128 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,130 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:33:50,130 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:33:50,131 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:33:50,131 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:33:50,132 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (1/1) ... [2022-11-25 23:33:50,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:33:50,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:33:50,168 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:33:50,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:33:50,228 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:33:50,228 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:33:50,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:33:50,229 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:33:50,229 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-25 23:33:50,229 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-25 23:33:50,310 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:33:50,312 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:33:50,532 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:33:50,578 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:33:50,579 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-25 23:33:50,581 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:33:50 BoogieIcfgContainer [2022-11-25 23:33:50,582 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:33:50,584 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:33:50,585 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:33:50,588 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:33:50,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:33:49" (1/3) ... [2022-11-25 23:33:50,590 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19fe6674 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:33:50, skipping insertion in model container [2022-11-25 23:33:50,590 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:33:50" (2/3) ... [2022-11-25 23:33:50,590 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19fe6674 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:33:50, skipping insertion in model container [2022-11-25 23:33:50,591 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:33:50" (3/3) ... [2022-11-25 23:33:50,592 INFO L112 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound5.c [2022-11-25 23:33:50,615 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:33:50,616 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:33:50,675 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:33:50,683 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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;@550ce289, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:33:50,683 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:33:50,688 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-25 23:33:50,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-25 23:33:50,697 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:50,698 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:50,699 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:50,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:50,706 INFO L85 PathProgramCache]: Analyzing trace with hash 151460259, now seen corresponding path program 1 times [2022-11-25 23:33:50,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:50,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628060726] [2022-11-25 23:33:50,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:50,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:50,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:50,909 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:50,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628060726] [2022-11-25 23:33:50,914 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-25 23:33:50,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363256876] [2022-11-25 23:33:50,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:50,915 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:33:50,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:33:50,922 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:33:50,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:33:51,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:51,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-25 23:33:51,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:33:51,047 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:33:51,047 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:33:51,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363256876] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:51,048 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:51,049 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:33:51,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460860391] [2022-11-25 23:33:51,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:51,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-25 23:33:51,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:51,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-25 23:33:51,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 23:33:51,120 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:51,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:51,196 INFO L93 Difference]: Finished difference Result 43 states and 74 transitions. [2022-11-25 23:33:51,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-25 23:33:51,208 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-25 23:33:51,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:51,222 INFO L225 Difference]: With dead ends: 43 [2022-11-25 23:33:51,222 INFO L226 Difference]: Without dead ends: 20 [2022-11-25 23:33:51,226 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 23:33:51,245 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:51,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:33:51,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-25 23:33:51,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-25 23:33:51,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 23:33:51,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 29 transitions. [2022-11-25 23:33:51,318 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 29 transitions. Word has length 7 [2022-11-25 23:33:51,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:51,320 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 29 transitions. [2022-11-25 23:33:51,321 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:51,324 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 29 transitions. [2022-11-25 23:33:51,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-25 23:33:51,326 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:51,326 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:51,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:33:51,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-25 23:33:51,534 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:51,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:51,535 INFO L85 PathProgramCache]: Analyzing trace with hash -310598151, now seen corresponding path program 1 times [2022-11-25 23:33:51,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:51,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419057215] [2022-11-25 23:33:51,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:51,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:51,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:51,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:33:51,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:51,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419057215] [2022-11-25 23:33:51,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419057215] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:51,890 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:51,890 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 23:33:51,890 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510360650] [2022-11-25 23:33:51,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:51,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:33:51,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:51,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:33:51,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:33:51,897 INFO L87 Difference]: Start difference. First operand 20 states and 29 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:52,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:52,013 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2022-11-25 23:33:52,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:33:52,017 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-25 23:33:52,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:52,018 INFO L225 Difference]: With dead ends: 33 [2022-11-25 23:33:52,018 INFO L226 Difference]: Without dead ends: 31 [2022-11-25 23:33:52,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-25 23:33:52,048 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:52,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 84 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:33:52,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-25 23:33:52,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2022-11-25 23:33:52,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 23:33:52,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-11-25 23:33:52,071 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 7 [2022-11-25 23:33:52,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:52,071 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-11-25 23:33:52,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:52,072 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-11-25 23:33:52,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-25 23:33:52,073 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:52,073 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:52,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 23:33:52,073 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:52,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:52,074 INFO L85 PathProgramCache]: Analyzing trace with hash -751211152, now seen corresponding path program 1 times [2022-11-25 23:33:52,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:52,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124935962] [2022-11-25 23:33:52,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:52,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:52,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:52,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:52,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124935962] [2022-11-25 23:33:52,105 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-25 23:33:52,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465879834] [2022-11-25 23:33:52,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:52,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:33:52,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:33:52,107 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:33:52,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:33:52,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:52,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-25 23:33:52,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:33:52,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:33:52,231 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:33:52,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465879834] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:52,232 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:52,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:33:52,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937789108] [2022-11-25 23:33:52,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:52,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 23:33:52,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:52,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 23:33:52,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:33:52,234 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:52,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:52,294 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2022-11-25 23:33:52,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:33:52,296 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-25 23:33:52,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:52,297 INFO L225 Difference]: With dead ends: 39 [2022-11-25 23:33:52,297 INFO L226 Difference]: Without dead ends: 26 [2022-11-25 23:33:52,297 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:33:52,299 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:52,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:33:52,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-25 23:33:52,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-25 23:33:52,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 23:33:52,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2022-11-25 23:33:52,311 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 9 [2022-11-25 23:33:52,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:52,311 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2022-11-25 23:33:52,311 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:33:52,312 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2022-11-25 23:33:52,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-25 23:33:52,312 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:52,314 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:52,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 23:33:52,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-25 23:33:52,520 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:52,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:52,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1841718534, now seen corresponding path program 1 times [2022-11-25 23:33:52,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:52,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424944964] [2022-11-25 23:33:52,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:52,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:52,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:52,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:33:52,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:52,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424944964] [2022-11-25 23:33:52,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [424944964] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:52,768 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:52,769 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 23:33:52,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879569754] [2022-11-25 23:33:52,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:52,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:33:52,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:52,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:33:52,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:33:52,772 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-25 23:33:52,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:52,847 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2022-11-25 23:33:52,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:33:52,848 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-11-25 23:33:52,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:52,849 INFO L225 Difference]: With dead ends: 39 [2022-11-25 23:33:52,849 INFO L226 Difference]: Without dead ends: 37 [2022-11-25 23:33:52,850 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-25 23:33:52,851 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:52,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 84 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:33:52,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-25 23:33:52,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2022-11-25 23:33:52,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-25 23:33:52,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2022-11-25 23:33:52,866 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2022-11-25 23:33:52,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:52,867 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2022-11-25 23:33:52,867 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-25 23:33:52,867 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2022-11-25 23:33:52,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-25 23:33:52,868 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:52,868 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:52,869 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-25 23:33:52,869 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:52,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:52,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1224204839, now seen corresponding path program 1 times [2022-11-25 23:33:52,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:52,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172637772] [2022-11-25 23:33:52,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:52,871 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:52,906 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:33:52,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [110984168] [2022-11-25 23:33:52,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:52,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:33:52,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:33:52,917 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:33:52,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:33:53,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:53,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:33:53,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:33:53,327 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:33:53,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:33:53,719 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:33:53,719 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:53,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172637772] [2022-11-25 23:33:53,720 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:33:53,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110984168] [2022-11-25 23:33:53,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110984168] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:33:53,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [123568987] [2022-11-25 23:33:53,753 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-25 23:33:53,753 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:33:53,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:33:53,765 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:33:53,765 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:33:54,183 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-25 23:33:54,202 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:33:54,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [123568987] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:54,814 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:33:54,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8, 7] total 17 [2022-11-25 23:33:54,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019931115] [2022-11-25 23:33:54,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:54,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:33:54,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:54,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:33:54,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2022-11-25 23:33:54,817 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 23:33:55,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:55,016 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2022-11-25 23:33:55,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 23:33:55,017 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-11-25 23:33:55,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:55,021 INFO L225 Difference]: With dead ends: 49 [2022-11-25 23:33:55,021 INFO L226 Difference]: Without dead ends: 47 [2022-11-25 23:33:55,022 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2022-11-25 23:33:55,025 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 1 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:55,025 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 70 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:33:55,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-25 23:33:55,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2022-11-25 23:33:55,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 30 states have internal predecessors, (33), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-25 23:33:55,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2022-11-25 23:33:55,051 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 17 [2022-11-25 23:33:55,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:55,053 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2022-11-25 23:33:55,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-25 23:33:55,053 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2022-11-25 23:33:55,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-25 23:33:55,055 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:55,055 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:55,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 23:33:55,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:33:55,262 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:55,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:55,262 INFO L85 PathProgramCache]: Analyzing trace with hash 1437524276, now seen corresponding path program 1 times [2022-11-25 23:33:55,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:55,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246179568] [2022-11-25 23:33:55,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:55,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:55,273 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:33:55,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1706167111] [2022-11-25 23:33:55,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:55,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:33:55,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:33:55,276 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:33:55,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:33:55,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:55,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-25 23:33:55,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:33:55,421 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 23:33:55,421 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:33:55,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:55,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246179568] [2022-11-25 23:33:55,422 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:33:55,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706167111] [2022-11-25 23:33:55,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1706167111] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:55,422 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:55,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 23:33:55,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514132471] [2022-11-25 23:33:55,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:55,424 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:33:55,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:55,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:33:55,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:33:55,425 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 23:33:55,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:55,479 INFO L93 Difference]: Finished difference Result 57 states and 66 transitions. [2022-11-25 23:33:55,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 23:33:55,480 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2022-11-25 23:33:55,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:55,482 INFO L225 Difference]: With dead ends: 57 [2022-11-25 23:33:55,482 INFO L226 Difference]: Without dead ends: 49 [2022-11-25 23:33:55,483 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:33:55,485 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 1 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:55,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 98 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:33:55,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-25 23:33:55,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2022-11-25 23:33:55,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 32 states have internal predecessors, (37), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-25 23:33:55,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2022-11-25 23:33:55,510 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 25 [2022-11-25 23:33:55,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:55,511 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2022-11-25 23:33:55,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 23:33:55,511 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2022-11-25 23:33:55,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-25 23:33:55,513 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:55,513 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:55,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 23:33:55,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-25 23:33:55,726 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:55,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:55,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1439252154, now seen corresponding path program 1 times [2022-11-25 23:33:55,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:55,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408182870] [2022-11-25 23:33:55,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:55,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:55,740 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:33:55,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1940635225] [2022-11-25 23:33:55,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:55,745 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:33:55,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:33:55,746 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:33:55,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:33:55,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:55,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:33:55,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:33:55,980 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 23:33:55,981 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:33:55,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:55,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408182870] [2022-11-25 23:33:55,981 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:33:55,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940635225] [2022-11-25 23:33:55,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940635225] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:33:55,981 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:33:55,982 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-25 23:33:55,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697638883] [2022-11-25 23:33:55,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:33:55,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 23:33:55,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:33:55,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 23:33:55,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-25 23:33:55,983 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 23:33:56,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:33:56,146 INFO L93 Difference]: Finished difference Result 59 states and 70 transitions. [2022-11-25 23:33:56,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:33:56,146 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2022-11-25 23:33:56,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:33:56,148 INFO L225 Difference]: With dead ends: 59 [2022-11-25 23:33:56,148 INFO L226 Difference]: Without dead ends: 55 [2022-11-25 23:33:56,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-25 23:33:56,149 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 10 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:33:56,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 97 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:33:56,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-25 23:33:56,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-11-25 23:33:56,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 36 states have internal predecessors, (41), 12 states have call successors, (12), 7 states have call predecessors, (12), 7 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-25 23:33:56,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2022-11-25 23:33:56,164 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 25 [2022-11-25 23:33:56,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:33:56,164 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2022-11-25 23:33:56,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-25 23:33:56,165 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2022-11-25 23:33:56,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-25 23:33:56,166 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:33:56,166 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:33:56,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:33:56,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:33:56,372 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:33:56,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:33:56,373 INFO L85 PathProgramCache]: Analyzing trace with hash 964329913, now seen corresponding path program 1 times [2022-11-25 23:33:56,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:33:56,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440025590] [2022-11-25 23:33:56,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:56,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:33:56,383 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:33:56,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1593212766] [2022-11-25 23:33:56,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:33:56,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:33:56,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:33:56,385 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:33:56,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:33:56,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:33:56,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-25 23:33:56,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:33:56,507 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 23:33:56,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:33:56,563 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-25 23:33:56,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:33:56,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440025590] [2022-11-25 23:33:56,565 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:33:56,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593212766] [2022-11-25 23:33:56,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593212766] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:33:56,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1778695472] [2022-11-25 23:33:56,569 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-25 23:33:56,570 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:33:56,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:33:56,570 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:33:56,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:33:59,974 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2022-11-25 23:34:00,040 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:34:06,261 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1341#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:34:06,261 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:34:06,262 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:34:06,262 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-25 23:34:06,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799102131] [2022-11-25 23:34:06,262 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:34:06,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 23:34:06,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:34:06,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 23:34:06,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=315, Unknown=2, NotChecked=0, Total=380 [2022-11-25 23:34:06,264 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-25 23:34:06,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:34:06,479 INFO L93 Difference]: Finished difference Result 118 states and 141 transitions. [2022-11-25 23:34:06,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-25 23:34:06,480 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 27 [2022-11-25 23:34:06,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:34:06,481 INFO L225 Difference]: With dead ends: 118 [2022-11-25 23:34:06,481 INFO L226 Difference]: Without dead ends: 105 [2022-11-25 23:34:06,482 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=83, Invalid=421, Unknown=2, NotChecked=0, Total=506 [2022-11-25 23:34:06,482 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 49 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:34:06,483 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 131 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:34:06,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-11-25 23:34:06,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2022-11-25 23:34:06,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 64 states have (on average 1.1875) internal successors, (76), 66 states have internal predecessors, (76), 22 states have call successors, (22), 13 states have call predecessors, (22), 13 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-25 23:34:06,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 118 transitions. [2022-11-25 23:34:06,500 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 118 transitions. Word has length 27 [2022-11-25 23:34:06,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:34:06,501 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 118 transitions. [2022-11-25 23:34:06,501 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-25 23:34:06,501 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 118 transitions. [2022-11-25 23:34:06,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-25 23:34:06,502 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:34:06,502 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:34:06,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 23:34:06,709 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:34:06,709 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:34:06,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:34:06,710 INFO L85 PathProgramCache]: Analyzing trace with hash -12098523, now seen corresponding path program 1 times [2022-11-25 23:34:06,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:34:06,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294459099] [2022-11-25 23:34:06,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:34:06,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:34:06,722 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:34:06,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1024308500] [2022-11-25 23:34:06,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:34:06,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:34:06,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:34:06,735 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:34:06,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:34:06,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:34:06,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-25 23:34:06,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:34:06,881 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:34:06,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:34:07,015 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:34:07,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:34:07,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294459099] [2022-11-25 23:34:07,015 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:34:07,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024308500] [2022-11-25 23:34:07,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024308500] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:34:07,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1111998745] [2022-11-25 23:34:07,020 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-25 23:34:07,020 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:34:07,021 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:34:07,021 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:34:07,021 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:34:07,412 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 56 for LOIs [2022-11-25 23:34:07,454 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:34:08,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1111998745] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:34:08,993 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:34:08,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 6] total 17 [2022-11-25 23:34:08,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545661246] [2022-11-25 23:34:08,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:34:08,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-25 23:34:08,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:34:08,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-25 23:34:08,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-11-25 23:34:08,995 INFO L87 Difference]: Start difference. First operand 100 states and 118 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 23:34:09,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:34:09,475 INFO L93 Difference]: Finished difference Result 128 states and 155 transitions. [2022-11-25 23:34:09,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-25 23:34:09,476 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2022-11-25 23:34:09,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:34:09,477 INFO L225 Difference]: With dead ends: 128 [2022-11-25 23:34:09,477 INFO L226 Difference]: Without dead ends: 91 [2022-11-25 23:34:09,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 61 SyntacticMatches, 12 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-11-25 23:34:09,479 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:34:09,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 98 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:34:09,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-25 23:34:09,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-11-25 23:34:09,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 58 states have (on average 1.1896551724137931) internal successors, (69), 60 states have internal predecessors, (69), 20 states have call successors, (20), 12 states have call predecessors, (20), 12 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-25 23:34:09,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2022-11-25 23:34:09,495 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 30 [2022-11-25 23:34:09,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:34:09,495 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2022-11-25 23:34:09,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-25 23:34:09,495 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2022-11-25 23:34:09,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-25 23:34:09,496 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:34:09,497 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-25 23:34:09,512 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 23:34:09,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:34:09,697 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:34:09,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:34:09,698 INFO L85 PathProgramCache]: Analyzing trace with hash -327624414, now seen corresponding path program 1 times [2022-11-25 23:34:09,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:34:09,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357381393] [2022-11-25 23:34:09,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:34:09,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:34:09,715 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:34:09,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1244707801] [2022-11-25 23:34:09,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:34:09,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:34:09,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:34:09,718 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:34:09,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 23:34:09,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:34:09,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-25 23:34:09,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:34:09,937 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:34:09,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:34:11,512 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 17 proven. 10 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:34:11,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:34:11,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357381393] [2022-11-25 23:34:11,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:34:11,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244707801] [2022-11-25 23:34:11,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244707801] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:34:11,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1781070969] [2022-11-25 23:34:11,515 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-25 23:34:11,515 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:34:11,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:34:11,516 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:34:11,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:34:14,477 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-25 23:34:14,483 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:34:15,908 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2393#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:34:15,908 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:34:15,909 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:34:15,909 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2022-11-25 23:34:15,909 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165915237] [2022-11-25 23:34:15,909 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:34:15,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 23:34:15,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:34:15,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 23:34:15,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2022-11-25 23:34:15,917 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 11 states have internal predecessors, (25), 6 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-25 23:34:21,262 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:34:23,265 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:34:23,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:34:23,847 INFO L93 Difference]: Finished difference Result 119 states and 143 transitions. [2022-11-25 23:34:23,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-25 23:34:23,848 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 11 states have internal predecessors, (25), 6 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) Word has length 35 [2022-11-25 23:34:23,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:34:23,850 INFO L225 Difference]: With dead ends: 119 [2022-11-25 23:34:23,850 INFO L226 Difference]: Without dead ends: 111 [2022-11-25 23:34:23,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=104, Invalid=496, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:34:23,852 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 45 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 39 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:34:23,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 97 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 262 Invalid, 2 Unknown, 0 Unchecked, 7.8s Time] [2022-11-25 23:34:23,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-11-25 23:34:23,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 103. [2022-11-25 23:34:23,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 66 states have (on average 1.1515151515151516) internal successors, (76), 69 states have internal predecessors, (76), 22 states have call successors, (22), 14 states have call predecessors, (22), 14 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-25 23:34:23,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2022-11-25 23:34:23,868 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 35 [2022-11-25 23:34:23,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:34:23,869 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2022-11-25 23:34:23,869 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 11 states have internal predecessors, (25), 6 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-25 23:34:23,869 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2022-11-25 23:34:23,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-25 23:34:23,870 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:34:23,870 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:34:23,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 23:34:24,076 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 23:34:24,076 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:34:24,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:34:24,077 INFO L85 PathProgramCache]: Analyzing trace with hash 1605911421, now seen corresponding path program 1 times [2022-11-25 23:34:24,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:34:24,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450697330] [2022-11-25 23:34:24,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:34:24,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:34:24,085 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:34:24,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2020419821] [2022-11-25 23:34:24,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:34:24,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:34:24,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:34:24,087 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:34:24,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 23:34:24,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:34:24,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 23:34:24,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:34:24,234 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-25 23:34:24,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:34:24,306 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-11-25 23:34:24,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:34:24,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450697330] [2022-11-25 23:34:24,307 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:34:24,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020419821] [2022-11-25 23:34:24,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2020419821] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:34:24,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [653246102] [2022-11-25 23:34:24,309 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-25 23:34:24,310 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:34:24,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:34:24,310 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:34:24,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:34:26,896 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2022-11-25 23:34:26,929 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:34:44,326 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2987#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:34:44,326 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:34:44,326 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:34:44,326 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2022-11-25 23:34:44,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743100874] [2022-11-25 23:34:44,327 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:34:44,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-25 23:34:44,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:34:44,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-25 23:34:44,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=378, Unknown=6, NotChecked=0, Total=462 [2022-11-25 23:34:44,329 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 states have internal predecessors, (30), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-25 23:34:44,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:34:44,542 INFO L93 Difference]: Finished difference Result 155 states and 179 transitions. [2022-11-25 23:34:44,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-25 23:34:44,543 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 states have internal predecessors, (30), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 43 [2022-11-25 23:34:44,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:34:44,544 INFO L225 Difference]: With dead ends: 155 [2022-11-25 23:34:44,544 INFO L226 Difference]: Without dead ends: 141 [2022-11-25 23:34:44,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=89, Invalid=457, Unknown=6, NotChecked=0, Total=552 [2022-11-25 23:34:44,546 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 42 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:34:44,546 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 149 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:34:44,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-25 23:34:44,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 136. [2022-11-25 23:34:44,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 88 states have (on average 1.1363636363636365) internal successors, (100), 92 states have internal predecessors, (100), 29 states have call successors, (29), 18 states have call predecessors, (29), 18 states have return successors, (27), 25 states have call predecessors, (27), 27 states have call successors, (27) [2022-11-25 23:34:44,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 156 transitions. [2022-11-25 23:34:44,569 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 156 transitions. Word has length 43 [2022-11-25 23:34:44,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:34:44,570 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 156 transitions. [2022-11-25 23:34:44,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 states have internal predecessors, (30), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-25 23:34:44,570 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 156 transitions. [2022-11-25 23:34:44,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-25 23:34:44,572 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:34:44,572 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:34:44,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 23:34:44,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:34:44,779 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:34:44,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:34:44,780 INFO L85 PathProgramCache]: Analyzing trace with hash 1607639299, now seen corresponding path program 1 times [2022-11-25 23:34:44,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:34:44,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796338065] [2022-11-25 23:34:44,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:34:44,781 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:34:44,794 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:34:44,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1215495619] [2022-11-25 23:34:44,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:34:44,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:34:44,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:34:44,796 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:34:44,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 23:34:44,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:34:44,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 23:34:44,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:34:48,643 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 25 proven. 17 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:34:48,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:34:49,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:34:49,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796338065] [2022-11-25 23:34:49,894 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:34:49,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215495619] [2022-11-25 23:34:49,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215495619] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:34:49,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1354202244] [2022-11-25 23:34:49,896 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-25 23:34:49,897 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:34:49,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:34:49,897 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:34:49,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:34:52,314 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2022-11-25 23:34:52,382 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:35:24,618 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3584#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-25 23:35:24,618 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:35:24,618 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:35:24,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2022-11-25 23:35:24,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859725192] [2022-11-25 23:35:24,618 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-25 23:35:24,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-25 23:35:24,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:35:24,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-25 23:35:24,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=596, Unknown=10, NotChecked=0, Total=702 [2022-11-25 23:35:24,620 INFO L87 Difference]: Start difference. First operand 136 states and 156 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-25 23:35:31,878 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-25 23:35:33,924 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.54s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-25 23:35:36,637 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2022-11-25 23:35:39,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:35:39,153 INFO L93 Difference]: Finished difference Result 161 states and 190 transitions. [2022-11-25 23:35:39,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-25 23:35:39,155 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2022-11-25 23:35:39,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:35:39,156 INFO L225 Difference]: With dead ends: 161 [2022-11-25 23:35:39,156 INFO L226 Difference]: Without dead ends: 159 [2022-11-25 23:35:39,157 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 38.6s TimeCoverageRelationStatistics Valid=118, Invalid=742, Unknown=10, NotChecked=0, Total=870 [2022-11-25 23:35:39,158 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 26 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 18 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:35:39,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 112 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 274 Invalid, 2 Unknown, 0 Unchecked, 10.3s Time] [2022-11-25 23:35:39,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-11-25 23:35:39,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 148. [2022-11-25 23:35:39,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 96 states have (on average 1.1354166666666667) internal successors, (109), 100 states have internal predecessors, (109), 31 states have call successors, (31), 20 states have call predecessors, (31), 20 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) [2022-11-25 23:35:39,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 169 transitions. [2022-11-25 23:35:39,187 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 169 transitions. Word has length 43 [2022-11-25 23:35:39,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:35:39,188 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 169 transitions. [2022-11-25 23:35:39,188 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-25 23:35:39,189 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 169 transitions. [2022-11-25 23:35:39,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-25 23:35:39,197 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:35:39,198 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:35:39,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 23:35:39,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 23:35:39,405 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:35:39,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:35:39,406 INFO L85 PathProgramCache]: Analyzing trace with hash -2003316837, now seen corresponding path program 1 times [2022-11-25 23:35:39,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:35:39,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119419668] [2022-11-25 23:35:39,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:35:39,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:35:39,415 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:35:39,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [501326493] [2022-11-25 23:35:39,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:35:39,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:35:39,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:35:39,421 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:35:39,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 23:35:41,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:35:41,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-25 23:35:41,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:35:42,190 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-25 23:35:42,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:36:07,837 WARN L859 $PredicateComparison]: unable to prove that (let ((.cse0 (mod |c_ULTIMATE.start_main_~p~0#1| 4294967296)) (.cse1 (mod |c_ULTIMATE.start_main_~d~0#1| 4294967296))) (or (= .cse0 1) (not (= .cse1 (mod (* |c_ULTIMATE.start_main_~p~0#1| |c_ULTIMATE.start_main_~B~0#1|) 4294967296))) (let ((.cse5 (div .cse1 2))) (let ((.cse2 (<= (mod .cse5 4294967296) (mod |c_ULTIMATE.start_main_~r~0#1| 4294967296))) (.cse6 (mod |c_ULTIMATE.start_main_~A~0#1| 4294967296)) (.cse4 (* |c_ULTIMATE.start_main_~B~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (and (or (not .cse2) (let ((.cse3 (* |c_ULTIMATE.start_main_~B~0#1| (div .cse0 2)))) (let ((.cse7 (* (div (+ .cse3 (- .cse5) .cse4 |c_ULTIMATE.start_main_~r~0#1|) 4294967296) 4294967296))) (and (< (+ .cse3 .cse4 |c_ULTIMATE.start_main_~r~0#1|) (+ .cse5 .cse6 1 .cse7)) (< (+ .cse5 .cse6 .cse7) (+ .cse3 .cse4 |c_ULTIMATE.start_main_~r~0#1| 1)))))) (or .cse2 (let ((.cse9 (+ .cse4 |c_ULTIMATE.start_main_~r~0#1|))) (let ((.cse8 (* (div .cse9 4294967296) 4294967296))) (and (< (+ .cse6 .cse8) (+ .cse4 |c_ULTIMATE.start_main_~r~0#1| 1)) (< .cse9 (+ .cse6 1 .cse8))))))))))) is different from true [2022-11-25 23:37:30,352 WARN L859 $PredicateComparison]: unable to prove that (let ((.cse0 (mod |c_ULTIMATE.start_main_~p~0#1| 4294967296)) (.cse2 (mod |c_ULTIMATE.start_main_~r~0#1| 4294967296)) (.cse1 (mod |c_ULTIMATE.start_main_~d~0#1| 4294967296))) (or (= .cse0 1) (<= .cse1 .cse2) (not (= .cse1 (mod (* |c_ULTIMATE.start_main_~p~0#1| |c_ULTIMATE.start_main_~B~0#1|) 4294967296))) (let ((.cse6 (div .cse1 2))) (let ((.cse3 (<= (mod .cse6 4294967296) .cse2)) (.cse7 (mod |c_ULTIMATE.start_main_~A~0#1| 4294967296)) (.cse5 (* |c_ULTIMATE.start_main_~B~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (and (or (not .cse3) (let ((.cse4 (* |c_ULTIMATE.start_main_~B~0#1| (div .cse0 2)))) (let ((.cse8 (* (div (+ .cse4 (- .cse6) .cse5 |c_ULTIMATE.start_main_~r~0#1|) 4294967296) 4294967296))) (and (< (+ .cse4 .cse5 |c_ULTIMATE.start_main_~r~0#1|) (+ .cse6 .cse7 1 .cse8)) (< (+ .cse6 .cse7 .cse8) (+ .cse4 .cse5 |c_ULTIMATE.start_main_~r~0#1| 1)))))) (or .cse3 (let ((.cse10 (+ .cse5 |c_ULTIMATE.start_main_~r~0#1|))) (let ((.cse9 (* (div .cse10 4294967296) 4294967296))) (and (< (+ .cse7 .cse9) (+ .cse5 |c_ULTIMATE.start_main_~r~0#1| 1)) (< .cse10 (+ .cse7 1 .cse9))))))))))) is different from true [2022-11-25 23:39:54,436 WARN L233 SmtUtils]: Spent 5.93s on a formula simplification that was a NOOP. DAG size: 39 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:40:43,367 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 35 proven. 17 refuted. 0 times theorem prover too weak. 76 trivial. 9 not checked. [2022-11-25 23:40:43,367 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:43,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119419668] [2022-11-25 23:40:43,368 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:43,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501326493] [2022-11-25 23:40:43,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501326493] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:43,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1844413320] [2022-11-25 23:40:43,370 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-25 23:40:43,370 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:43,370 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:43,370 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:43,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:46,634 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 21 for LOIs [2022-11-25 23:40:46,647 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:15,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4395#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:15,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:15,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:41:15,560 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 18 [2022-11-25 23:41:15,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917437506] [2022-11-25 23:41:15,560 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:15,561 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-25 23:41:15,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:15,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-25 23:41:15,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=796, Unknown=16, NotChecked=118, Total=1056 [2022-11-25 23:41:15,563 INFO L87 Difference]: Start difference. First operand 148 states and 169 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 15 states have internal predecessors, (37), 9 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 8 states have call predecessors, (16), 7 states have call successors, (16) [2022-11-25 23:41:20,265 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:41:23,620 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:41:25,637 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:41:28,108 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:41:30,511 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:41:35,067 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:41:37,515 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:41:44,912 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:43:00,535 WARN L233 SmtUtils]: Spent 1.22m on a formula simplification. DAG size of input: 81 DAG size of output: 70 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:43:03,298 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:43:05,358 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:43:22,537 WARN L233 SmtUtils]: Spent 11.84s on a formula simplification that was a NOOP. DAG size: 43 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:43:25,977 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:43:27,981 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:43:30,188 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:43:35,053 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.98s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:43:37,057 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:43:39,369 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:43:54,524 WARN L233 SmtUtils]: Spent 9.63s on a formula simplification that was a NOOP. DAG size: 45 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:43:57,847 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.88s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:44:02,080 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:44:04,471 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:44:07,389 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:44:09,202 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:02,442 WARN L233 SmtUtils]: Spent 47.60s on a formula simplification. DAG size of input: 74 DAG size of output: 64 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:45:04,550 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:09,053 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:11,060 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:14,377 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:17,168 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:18,788 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.62s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:20,833 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:23,688 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:26,440 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:28,579 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:30,588 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:46:45,091 WARN L233 SmtUtils]: Spent 1.06m on a formula simplification. DAG size of input: 76 DAG size of output: 66 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:46:50,510 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:46:53,821 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:46:56,047 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:46:58,064 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:46:59,121 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:47:19,954 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:47:21,957 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:47:24,088 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:47:24,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:24,583 INFO L93 Difference]: Finished difference Result 190 states and 219 transitions. [2022-11-25 23:47:24,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-25 23:47:24,584 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 15 states have internal predecessors, (37), 9 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 8 states have call predecessors, (16), 7 states have call successors, (16) Word has length 56 [2022-11-25 23:47:24,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:24,586 INFO L225 Difference]: With dead ends: 190 [2022-11-25 23:47:24,586 INFO L226 Difference]: Without dead ends: 188 [2022-11-25 23:47:24,587 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 135 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 318.3s TimeCoverageRelationStatistics Valid=190, Invalid=1268, Unknown=32, NotChecked=150, Total=1640 [2022-11-25 23:47:24,587 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 44 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 59 mSolverCounterUnsat, 33 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 114.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 33 IncrementalHoareTripleChecker+Unknown, 153 IncrementalHoareTripleChecker+Unchecked, 115.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:24,588 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 139 Invalid, 648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 403 Invalid, 33 Unknown, 153 Unchecked, 115.0s Time] [2022-11-25 23:47:24,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2022-11-25 23:47:24,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 171. [2022-11-25 23:47:24,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 113 states have (on average 1.1150442477876106) internal successors, (126), 118 states have internal predecessors, (126), 32 states have call successors, (32), 25 states have call predecessors, (32), 25 states have return successors, (30), 27 states have call predecessors, (30), 30 states have call successors, (30) [2022-11-25 23:47:24,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 188 transitions. [2022-11-25 23:47:24,634 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 188 transitions. Word has length 56 [2022-11-25 23:47:24,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:24,634 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 188 transitions. [2022-11-25 23:47:24,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 15 states have internal predecessors, (37), 9 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 8 states have call predecessors, (16), 7 states have call successors, (16) [2022-11-25 23:47:24,634 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 188 transitions. [2022-11-25 23:47:24,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-25 23:47:24,636 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:24,636 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:24,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:24,842 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-25 23:47:24,843 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:24,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:24,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1761265692, now seen corresponding path program 2 times [2022-11-25 23:47:24,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:24,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899419464] [2022-11-25 23:47:24,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:24,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:24,851 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:47:24,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [61942234] [2022-11-25 23:47:24,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:47:24,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:24,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:24,853 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:24,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba02239d-66d1-4ff8-8bd8-4191be459de0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 23:47:25,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:47:25,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:47:25,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-25 23:47:25,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:27,900 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 41 proven. 11 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:47:27,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:46,571 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 41 proven. 10 refuted. 1 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-25 23:47:46,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:46,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899419464] [2022-11-25 23:47:46,571 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:47:46,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [61942234] [2022-11-25 23:47:46,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [61942234] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:46,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [579406367] [2022-11-25 23:47:46,573 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-25 23:47:46,574 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:46,574 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:46,574 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:46,574 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:49,650 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-11-25 23:47:49,662 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:56,083 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5319#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:56,083 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:56,083 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:47:56,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2022-11-25 23:47:56,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33297985] [2022-11-25 23:47:56,084 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:56,084 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-25 23:47:56,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:56,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-25 23:47:56,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=692, Unknown=3, NotChecked=0, Total=812 [2022-11-25 23:47:56,086 INFO L87 Difference]: Start difference. First operand 171 states and 188 transitions. Second operand has 16 states, 14 states have (on average 2.642857142857143) internal successors, (37), 13 states have internal predecessors, (37), 8 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-25 23:48:02,816 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:48:34,319 WARN L233 SmtUtils]: Spent 24.99s on a formula simplification that was a NOOP. DAG size: 65 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:48:36,325 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:48:41,002 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:48:48,342 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []