./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh --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 aa34b6970b46b2c3f1bda76d086482188f10831dd44cba913e5171769601c6f3 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 13:24:07,828 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 13:24:07,829 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 13:24:07,842 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 13:24:07,842 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 13:24:07,843 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 13:24:07,844 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 13:24:07,845 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 13:24:07,846 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 13:24:07,846 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 13:24:07,847 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 13:24:07,848 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 13:24:07,848 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 13:24:07,849 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 13:24:07,850 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 13:24:07,850 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 13:24:07,851 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 13:24:07,852 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 13:24:07,853 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 13:24:07,854 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 13:24:07,855 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 13:24:07,856 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 13:24:07,858 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 13:24:07,859 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 13:24:07,863 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 13:24:07,863 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 13:24:07,863 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 13:24:07,864 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 13:24:07,865 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 13:24:07,865 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 13:24:07,866 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 13:24:07,866 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 13:24:07,867 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 13:24:07,868 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 13:24:07,869 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 13:24:07,869 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 13:24:07,870 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 13:24:07,870 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 13:24:07,870 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 13:24:07,871 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 13:24:07,871 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 13:24:07,872 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 13:24:07,896 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 13:24:07,897 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 13:24:07,897 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 13:24:07,897 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 13:24:07,898 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 13:24:07,898 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 13:24:07,898 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 13:24:07,899 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 13:24:07,899 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 13:24:07,899 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 13:24:07,899 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 13:24:07,899 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 13:24:07,900 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 13:24:07,900 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 13:24:07,900 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 13:24:07,900 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 13:24:07,900 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 13:24:07,901 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 13:24:07,901 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 13:24:07,901 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 13:24:07,901 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 13:24:07,901 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 13:24:07,902 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 13:24:07,902 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 13:24:07,902 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 13:24:07,902 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 13:24:07,902 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 13:24:07,902 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 13:24:07,903 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 13:24:07,903 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 13:24:07,903 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 13:24:07,903 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 13:24:07,903 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:24:07,903 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 13:24:07,904 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 13:24:07,904 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 13:24:07,904 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 13:24:07,904 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 13:24:07,904 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 13:24:07,904 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 13:24:07,904 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 13:24:07,904 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_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aa34b6970b46b2c3f1bda76d086482188f10831dd44cba913e5171769601c6f3 [2022-12-14 13:24:08,063 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 13:24:08,079 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 13:24:08,081 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 13:24:08,082 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 13:24:08,082 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 13:24:08,083 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c [2022-12-14 13:24:10,640 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 13:24:10,755 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 13:24:10,756 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c [2022-12-14 13:24:10,760 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/data/358d236d2/bac6c13d1c794bc5bd03ad8bac7534f4/FLAG881a084ca [2022-12-14 13:24:10,769 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/data/358d236d2/bac6c13d1c794bc5bd03ad8bac7534f4 [2022-12-14 13:24:10,771 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 13:24:10,772 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 13:24:10,773 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 13:24:10,773 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 13:24:10,776 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 13:24:10,776 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,777 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20d4c451 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10, skipping insertion in model container [2022-12-14 13:24:10,777 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,783 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 13:24:10,794 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 13:24:10,896 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_2c370817-9ada-45be-baec-27f4f2092bfe/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c[490,503] [2022-12-14 13:24:10,910 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:24:10,917 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 13:24:10,926 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_2c370817-9ada-45be-baec-27f4f2092bfe/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c[490,503] [2022-12-14 13:24:10,932 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:24:10,942 INFO L208 MainTranslator]: Completed translation [2022-12-14 13:24:10,943 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10 WrapperNode [2022-12-14 13:24:10,943 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 13:24:10,943 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 13:24:10,943 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 13:24:10,944 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 13:24:10,949 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,954 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,967 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 84 [2022-12-14 13:24:10,967 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 13:24:10,968 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 13:24:10,968 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 13:24:10,968 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 13:24:10,974 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,974 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,975 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,975 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,977 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,980 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,981 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,981 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,982 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 13:24:10,983 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 13:24:10,983 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 13:24:10,983 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 13:24:10,984 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (1/1) ... [2022-12-14 13:24:10,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:24:10,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:11,008 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 13:24:11,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 13:24:11,043 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 13:24:11,043 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-12-14 13:24:11,044 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-12-14 13:24:11,044 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 13:24:11,044 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 13:24:11,044 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 13:24:11,044 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 13:24:11,044 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 13:24:11,100 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 13:24:11,102 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 13:24:11,224 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 13:24:11,241 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 13:24:11,241 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 13:24:11,243 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:24:11 BoogieIcfgContainer [2022-12-14 13:24:11,243 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 13:24:11,245 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 13:24:11,245 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 13:24:11,248 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 13:24:11,248 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 01:24:10" (1/3) ... [2022-12-14 13:24:11,249 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a2666ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:24:11, skipping insertion in model container [2022-12-14 13:24:11,249 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:24:10" (2/3) ... [2022-12-14 13:24:11,249 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a2666ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:24:11, skipping insertion in model container [2022-12-14 13:24:11,249 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:24:11" (3/3) ... [2022-12-14 13:24:11,250 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound10.c [2022-12-14 13:24:11,264 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 13:24:11,264 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 13:24:11,298 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 13:24:11,302 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;@1461a835, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 13:24:11,303 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 13:24:11,306 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-12-14 13:24:11,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 13:24:11,311 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:11,311 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:11,312 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:11,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:11,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1288775727, now seen corresponding path program 1 times [2022-12-14 13:24:11,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:11,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506249289] [2022-12-14 13:24:11,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:11,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:11,405 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:11,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1866851325] [2022-12-14 13:24:11,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:11,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:11,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:11,408 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:11,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 13:24:11,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:11,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 1 conjunts are in the unsatisfiable core [2022-12-14 13:24:11,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:11,494 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 13:24:11,494 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:24:11,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:11,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506249289] [2022-12-14 13:24:11,494 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:11,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866851325] [2022-12-14 13:24:11,495 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866851325] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:24:11,495 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:24:11,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 13:24:11,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042656324] [2022-12-14 13:24:11,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:24:11,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 13:24:11,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:11,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 13:24:11,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 13:24:11,523 INFO L87 Difference]: Start difference. First operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-12-14 13:24:11,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:24:11,547 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2022-12-14 13:24:11,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 13:24:11,549 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2022-12-14 13:24:11,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:24:11,554 INFO L225 Difference]: With dead ends: 50 [2022-12-14 13:24:11,554 INFO L226 Difference]: Without dead ends: 27 [2022-12-14 13:24:11,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 13:24:11,559 INFO L413 NwaCegarLoop]: 37 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, 37 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 [2022-12-14 13:24:11,560 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:24:11,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-12-14 13:24:11,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-12-14 13:24:11,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 16 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 13:24:11,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 38 transitions. [2022-12-14 13:24:11,588 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 38 transitions. Word has length 19 [2022-12-14 13:24:11,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:24:11,589 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 38 transitions. [2022-12-14 13:24:11,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-12-14 13:24:11,589 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 38 transitions. [2022-12-14 13:24:11,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 13:24:11,590 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:11,590 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:11,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 13:24:11,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:11,792 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:11,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:11,795 INFO L85 PathProgramCache]: Analyzing trace with hash 226858993, now seen corresponding path program 1 times [2022-12-14 13:24:11,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:11,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726314379] [2022-12-14 13:24:11,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:11,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:11,844 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:11,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2067760400] [2022-12-14 13:24:11,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:11,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:11,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:11,850 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:11,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 13:24:12,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:12,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 13:24:12,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:12,097 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 13:24:12,097 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:24:12,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:12,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726314379] [2022-12-14 13:24:12,098 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:12,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067760400] [2022-12-14 13:24:12,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067760400] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:24:12,099 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:24:12,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 13:24:12,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262513915] [2022-12-14 13:24:12,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:24:12,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 13:24:12,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:12,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 13:24:12,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:24:12,101 INFO L87 Difference]: Start difference. First operand 27 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-12-14 13:24:12,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:24:12,119 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2022-12-14 13:24:12,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 13:24:12,119 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), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2022-12-14 13:24:12,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:24:12,120 INFO L225 Difference]: With dead ends: 37 [2022-12-14 13:24:12,120 INFO L226 Difference]: Without dead ends: 29 [2022-12-14 13:24:12,120 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 13:24:12,121 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:24:12,121 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:24:12,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-12-14 13:24:12,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-12-14 13:24:12,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 13:24:12,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2022-12-14 13:24:12,127 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 20 [2022-12-14 13:24:12,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:24:12,127 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2022-12-14 13:24:12,127 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), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-12-14 13:24:12,127 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2022-12-14 13:24:12,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 13:24:12,128 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:12,128 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:12,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 13:24:12,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:12,330 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:12,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:12,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1563892497, now seen corresponding path program 1 times [2022-12-14 13:24:12,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:12,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754523381] [2022-12-14 13:24:12,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:12,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:12,373 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:12,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [169393190] [2022-12-14 13:24:12,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:12,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:12,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:12,378 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:12,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 13:24:12,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:12,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 13:24:12,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:12,465 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-12-14 13:24:12,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:24:12,522 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-12-14 13:24:12,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:12,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754523381] [2022-12-14 13:24:12,523 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:12,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169393190] [2022-12-14 13:24:12,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169393190] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:24:12,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1913715774] [2022-12-14 13:24:12,540 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 13:24:12,540 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:24:12,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:24:12,549 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:24:12,550 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:24:13,127 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:24:13,154 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:24:14,406 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1913715774] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:24:14,407 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:24:14,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 5] total 15 [2022-12-14 13:24:14,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842476618] [2022-12-14 13:24:14,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:24:14,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 13:24:14,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:14,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 13:24:14,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2022-12-14 13:24:14,408 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-12-14 13:24:14,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:24:14,599 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-12-14 13:24:14,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 13:24:14,600 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2022-12-14 13:24:14,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:24:14,601 INFO L225 Difference]: With dead ends: 38 [2022-12-14 13:24:14,601 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 13:24:14,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2022-12-14 13:24:14,602 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:24:14,603 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 113 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:24:14,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 13:24:14,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-12-14 13:24:14,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 13:24:14,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2022-12-14 13:24:14,612 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 21 [2022-12-14 13:24:14,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:24:14,612 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2022-12-14 13:24:14,612 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-12-14 13:24:14,612 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2022-12-14 13:24:14,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 13:24:14,613 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:14,613 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:14,618 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 13:24:14,813 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:14,814 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:14,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:14,814 INFO L85 PathProgramCache]: Analyzing trace with hash 281079646, now seen corresponding path program 1 times [2022-12-14 13:24:14,814 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:14,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74363798] [2022-12-14 13:24:14,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:14,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:14,824 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:14,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1708837940] [2022-12-14 13:24:14,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:14,825 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:14,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:14,826 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:14,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 13:24:14,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:14,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 17 conjunts are in the unsatisfiable core [2022-12-14 13:24:14,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:14,918 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-12-14 13:24:14,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:24:14,964 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 13:24:14,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:14,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74363798] [2022-12-14 13:24:14,965 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:14,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708837940] [2022-12-14 13:24:14,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708837940] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 13:24:14,965 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:24:14,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2022-12-14 13:24:14,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860833533] [2022-12-14 13:24:14,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:24:14,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:24:14,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:14,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:24:14,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-12-14 13:24:14,967 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-12-14 13:24:15,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:24:15,111 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2022-12-14 13:24:15,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 13:24:15,111 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 23 [2022-12-14 13:24:15,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:24:15,112 INFO L225 Difference]: With dead ends: 36 [2022-12-14 13:24:15,112 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 13:24:15,112 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-12-14 13:24:15,113 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 8 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:24:15,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 95 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:24:15,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 13:24:15,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-12-14 13:24:15,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 13:24:15,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2022-12-14 13:24:15,120 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 23 [2022-12-14 13:24:15,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:24:15,121 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2022-12-14 13:24:15,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-12-14 13:24:15,121 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2022-12-14 13:24:15,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 13:24:15,121 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:15,121 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:15,125 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 13:24:15,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:15,323 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:15,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:15,324 INFO L85 PathProgramCache]: Analyzing trace with hash -717512630, now seen corresponding path program 1 times [2022-12-14 13:24:15,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:15,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551001572] [2022-12-14 13:24:15,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:15,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:15,351 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:15,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1831796877] [2022-12-14 13:24:15,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:15,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:15,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:15,355 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:15,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 13:24:15,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:15,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 13:24:15,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:15,448 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 13:24:15,448 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:24:15,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:15,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [551001572] [2022-12-14 13:24:15,448 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:15,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831796877] [2022-12-14 13:24:15,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831796877] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:24:15,449 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:24:15,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 13:24:15,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222182942] [2022-12-14 13:24:15,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:24:15,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:24:15,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:15,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:24:15,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 13:24:15,450 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-12-14 13:24:15,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:24:15,468 INFO L93 Difference]: Finished difference Result 59 states and 77 transitions. [2022-12-14 13:24:15,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 13:24:15,468 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 26 [2022-12-14 13:24:15,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:24:15,469 INFO L225 Difference]: With dead ends: 59 [2022-12-14 13:24:15,469 INFO L226 Difference]: Without dead ends: 36 [2022-12-14 13:24:15,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 13:24:15,474 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:24:15,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:24:15,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-12-14 13:24:15,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-12-14 13:24:15,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 23 states have internal predecessors, (27), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 13:24:15,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2022-12-14 13:24:15,484 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 26 [2022-12-14 13:24:15,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:24:15,484 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2022-12-14 13:24:15,484 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-12-14 13:24:15,485 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2022-12-14 13:24:15,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 13:24:15,485 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:15,485 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:15,489 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 13:24:15,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:15,687 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:15,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:15,688 INFO L85 PathProgramCache]: Analyzing trace with hash -207347326, now seen corresponding path program 1 times [2022-12-14 13:24:15,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:15,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836111720] [2022-12-14 13:24:15,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:15,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:15,723 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:15,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [147015713] [2022-12-14 13:24:15,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:15,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:15,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:15,727 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:15,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 13:24:15,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:15,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 13:24:15,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:15,932 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 13:24:15,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:24:16,013 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 13:24:16,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:16,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836111720] [2022-12-14 13:24:16,014 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:16,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147015713] [2022-12-14 13:24:16,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147015713] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 13:24:16,014 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:24:16,014 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 13 [2022-12-14 13:24:16,014 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114216220] [2022-12-14 13:24:16,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:24:16,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:24:16,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:16,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:24:16,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-12-14 13:24:16,016 INFO L87 Difference]: Start difference. First operand 36 states and 46 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-12-14 13:24:16,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:24:16,070 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2022-12-14 13:24:16,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 13:24:16,071 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 28 [2022-12-14 13:24:16,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:24:16,072 INFO L225 Difference]: With dead ends: 50 [2022-12-14 13:24:16,072 INFO L226 Difference]: Without dead ends: 48 [2022-12-14 13:24:16,072 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-12-14 13:24:16,073 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 7 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:24:16,073 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 121 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:24:16,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-12-14 13:24:16,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2022-12-14 13:24:16,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 28 states have (on average 1.25) internal successors, (35), 29 states have internal predecessors, (35), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-12-14 13:24:16,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 62 transitions. [2022-12-14 13:24:16,082 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 62 transitions. Word has length 28 [2022-12-14 13:24:16,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:24:16,083 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 62 transitions. [2022-12-14 13:24:16,083 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-12-14 13:24:16,083 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 62 transitions. [2022-12-14 13:24:16,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 13:24:16,083 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:16,083 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:16,089 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 13:24:16,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 13:24:16,285 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:16,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:16,286 INFO L85 PathProgramCache]: Analyzing trace with hash -159662690, now seen corresponding path program 1 times [2022-12-14 13:24:16,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:16,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497725423] [2022-12-14 13:24:16,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:16,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:16,313 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:16,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1640469138] [2022-12-14 13:24:16,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:16,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:16,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:16,317 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:16,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 13:24:16,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:16,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 13:24:16,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:16,581 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 13:24:16,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:24:16,700 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-12-14 13:24:16,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:16,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497725423] [2022-12-14 13:24:16,700 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:16,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640469138] [2022-12-14 13:24:16,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640469138] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 13:24:16,701 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:24:16,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2022-12-14 13:24:16,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124646040] [2022-12-14 13:24:16,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:24:16,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:24:16,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:16,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:24:16,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-12-14 13:24:16,702 INFO L87 Difference]: Start difference. First operand 47 states and 62 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 13:24:16,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:24:16,757 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2022-12-14 13:24:16,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 13:24:16,758 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 33 [2022-12-14 13:24:16,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:24:16,759 INFO L225 Difference]: With dead ends: 54 [2022-12-14 13:24:16,759 INFO L226 Difference]: Without dead ends: 52 [2022-12-14 13:24:16,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-12-14 13:24:16,760 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 7 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:24:16,760 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 112 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:24:16,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-12-14 13:24:16,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2022-12-14 13:24:16,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 32 states have internal predecessors, (38), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-12-14 13:24:16,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 65 transitions. [2022-12-14 13:24:16,770 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 65 transitions. Word has length 33 [2022-12-14 13:24:16,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:24:16,771 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 65 transitions. [2022-12-14 13:24:16,771 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 13:24:16,771 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 65 transitions. [2022-12-14 13:24:16,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 13:24:16,772 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:16,772 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:16,776 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 13:24:16,973 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:16,974 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:16,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:16,975 INFO L85 PathProgramCache]: Analyzing trace with hash -2048234814, now seen corresponding path program 1 times [2022-12-14 13:24:16,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:16,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17289679] [2022-12-14 13:24:16,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:16,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:17,000 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:17,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1268110] [2022-12-14 13:24:17,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:17,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:17,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:17,005 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:17,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 13:24:17,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:17,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 13:24:17,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:17,192 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 13:24:17,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:24:17,269 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:17,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17289679] [2022-12-14 13:24:17,269 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:17,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268110] [2022-12-14 13:24:17,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268110] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:24:17,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [441721534] [2022-12-14 13:24:17,272 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 13:24:17,272 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:24:17,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:24:17,272 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:24:17,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:24:18,097 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-12-14 13:24:18,105 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:24:18,120 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:24:32,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [441721534] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:24:32,293 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:24:32,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [7] total 22 [2022-12-14 13:24:32,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588808785] [2022-12-14 13:24:32,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:24:32,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 13:24:32,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:32,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 13:24:32,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-12-14 13:24:32,295 INFO L87 Difference]: Start difference. First operand 51 states and 65 transitions. Second operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-12-14 13:24:32,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:24:32,829 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2022-12-14 13:24:32,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 13:24:32,830 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 38 [2022-12-14 13:24:32,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:24:32,831 INFO L225 Difference]: With dead ends: 75 [2022-12-14 13:24:32,831 INFO L226 Difference]: Without dead ends: 73 [2022-12-14 13:24:32,831 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 47 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-12-14 13:24:32,831 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:24:32,832 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 117 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 13:24:32,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-12-14 13:24:32,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2022-12-14 13:24:32,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 45 states have internal predecessors, (50), 18 states have call successors, (18), 9 states have call predecessors, (18), 9 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-12-14 13:24:32,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2022-12-14 13:24:32,847 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 38 [2022-12-14 13:24:32,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:24:32,847 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2022-12-14 13:24:32,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-12-14 13:24:32,848 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2022-12-14 13:24:32,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 13:24:32,848 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:32,848 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:32,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-12-14 13:24:33,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:33,049 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:33,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:33,051 INFO L85 PathProgramCache]: Analyzing trace with hash 2026078407, now seen corresponding path program 1 times [2022-12-14 13:24:33,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:33,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562338868] [2022-12-14 13:24:33,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:33,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:33,072 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:33,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1342335158] [2022-12-14 13:24:33,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:33,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:33,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:33,076 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:33,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 13:24:33,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:33,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 13:24:33,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:33,177 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 13:24:33,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:24:33,228 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 13:24:33,228 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:33,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562338868] [2022-12-14 13:24:33,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:33,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342335158] [2022-12-14 13:24:33,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342335158] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:24:33,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [608357447] [2022-12-14 13:24:33,231 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-12-14 13:24:33,231 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:24:33,232 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:24:33,232 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:24:33,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:24:40,929 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-12-14 13:24:40,933 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:24:40,945 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:24:49,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [608357447] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:24:49,180 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:24:49,181 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [5, 6] total 26 [2022-12-14 13:24:49,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416091882] [2022-12-14 13:24:49,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:24:49,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 13:24:49,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:24:49,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 13:24:49,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=492, Unknown=0, NotChecked=0, Total=650 [2022-12-14 13:24:49,183 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-12-14 13:24:51,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:24:51,107 INFO L93 Difference]: Finished difference Result 114 states and 143 transitions. [2022-12-14 13:24:51,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 13:24:51,108 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 47 [2022-12-14 13:24:51,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:24:51,108 INFO L225 Difference]: With dead ends: 114 [2022-12-14 13:24:51,108 INFO L226 Difference]: Without dead ends: 91 [2022-12-14 13:24:51,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 103 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2022-12-14 13:24:51,109 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 0 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 13:24:51,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 121 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 13:24:51,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-12-14 13:24:51,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-12-14 13:24:51,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 57 states have (on average 1.1578947368421053) internal successors, (66), 58 states have internal predecessors, (66), 22 states have call successors, (22), 11 states have call predecessors, (22), 11 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-12-14 13:24:51,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 109 transitions. [2022-12-14 13:24:51,126 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 109 transitions. Word has length 47 [2022-12-14 13:24:51,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:24:51,126 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 109 transitions. [2022-12-14 13:24:51,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-12-14 13:24:51,127 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 109 transitions. [2022-12-14 13:24:51,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-12-14 13:24:51,127 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:24:51,127 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:24:51,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 13:24:51,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-12-14 13:24:51,328 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:24:51,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:24:51,328 INFO L85 PathProgramCache]: Analyzing trace with hash -892989886, now seen corresponding path program 1 times [2022-12-14 13:24:51,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:24:51,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979802701] [2022-12-14 13:24:51,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:51,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:24:51,334 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:24:51,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1315027101] [2022-12-14 13:24:51,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:24:51,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:24:51,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:24:51,335 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:24:51,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 13:24:51,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:24:51,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 13:24:51,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:24:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 13:24:51,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:24:51,485 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-12-14 13:24:51,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:24:51,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979802701] [2022-12-14 13:24:51,485 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:24:51,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315027101] [2022-12-14 13:24:51,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315027101] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:24:51,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1780877310] [2022-12-14 13:24:51,488 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-12-14 13:24:51,488 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:24:51,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:24:51,488 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:24:51,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:25:03,436 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 13:25:03,439 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:25:03,450 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:25:13,587 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3003#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:25:13,588 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:25:13,588 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:25:13,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-12-14 13:25:13,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878808731] [2022-12-14 13:25:13,588 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:25:13,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 13:25:13,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:25:13,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 13:25:13,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=874, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 13:25:13,590 INFO L87 Difference]: Start difference. First operand 91 states and 109 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2022-12-14 13:25:13,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:25:13,787 INFO L93 Difference]: Finished difference Result 239 states and 287 transitions. [2022-12-14 13:25:13,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 13:25:13,788 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 49 [2022-12-14 13:25:13,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:25:13,789 INFO L225 Difference]: With dead ends: 239 [2022-12-14 13:25:13,789 INFO L226 Difference]: Without dead ends: 216 [2022-12-14 13:25:13,790 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=212, Invalid=1120, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 13:25:13,790 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 70 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:25:13,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 197 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:25:13,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-12-14 13:25:13,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 202. [2022-12-14 13:25:13,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 130 states have (on average 1.1615384615384616) internal successors, (151), 133 states have internal predecessors, (151), 46 states have call successors, (46), 25 states have call predecessors, (46), 25 states have return successors, (43), 43 states have call predecessors, (43), 43 states have call successors, (43) [2022-12-14 13:25:13,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 240 transitions. [2022-12-14 13:25:13,819 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 240 transitions. Word has length 49 [2022-12-14 13:25:13,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:25:13,819 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 240 transitions. [2022-12-14 13:25:13,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2022-12-14 13:25:13,820 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 240 transitions. [2022-12-14 13:25:13,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 13:25:13,820 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:25:13,820 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:25:13,825 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 13:25:14,021 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 13:25:14,022 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:25:14,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:25:14,023 INFO L85 PathProgramCache]: Analyzing trace with hash 1428661434, now seen corresponding path program 1 times [2022-12-14 13:25:14,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:25:14,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429024125] [2022-12-14 13:25:14,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:25:14,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:25:14,045 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:25:14,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [397243118] [2022-12-14 13:25:14,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:25:14,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:25:14,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:25:14,049 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:25:14,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 13:25:14,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:25:14,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 13:25:14,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:25:14,201 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 13:25:14,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:25:14,278 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 13:25:14,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:25:14,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429024125] [2022-12-14 13:25:14,278 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:25:14,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397243118] [2022-12-14 13:25:14,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397243118] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:25:14,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1631514767] [2022-12-14 13:25:14,281 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 13:25:14,281 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:25:14,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:25:14,281 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:25:14,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:25:18,851 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 13:25:18,855 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:25:18,865 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:25:29,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4033#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:25:29,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:25:29,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:25:29,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-12-14 13:25:29,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117846130] [2022-12-14 13:25:29,627 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:25:29,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 13:25:29,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:25:29,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 13:25:29,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2022-12-14 13:25:29,629 INFO L87 Difference]: Start difference. First operand 202 states and 240 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2022-12-14 13:25:29,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:25:29,801 INFO L93 Difference]: Finished difference Result 231 states and 277 transitions. [2022-12-14 13:25:29,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 13:25:29,802 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 61 [2022-12-14 13:25:29,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:25:29,804 INFO L225 Difference]: With dead ends: 231 [2022-12-14 13:25:29,804 INFO L226 Difference]: Without dead ends: 229 [2022-12-14 13:25:29,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=140, Invalid=852, Unknown=0, NotChecked=0, Total=992 [2022-12-14 13:25:29,804 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:25:29,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 76 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:25:29,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-12-14 13:25:29,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 228. [2022-12-14 13:25:29,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 145 states have (on average 1.1448275862068966) internal successors, (166), 150 states have internal predecessors, (166), 54 states have call successors, (54), 28 states have call predecessors, (54), 28 states have return successors, (51), 49 states have call predecessors, (51), 51 states have call successors, (51) [2022-12-14 13:25:29,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 271 transitions. [2022-12-14 13:25:29,847 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 271 transitions. Word has length 61 [2022-12-14 13:25:29,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:25:29,848 INFO L495 AbstractCegarLoop]: Abstraction has 228 states and 271 transitions. [2022-12-14 13:25:29,848 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2022-12-14 13:25:29,848 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 271 transitions. [2022-12-14 13:25:29,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-12-14 13:25:29,849 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:25:29,849 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:25:29,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-12-14 13:25:30,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:25:30,050 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:25:30,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:25:30,051 INFO L85 PathProgramCache]: Analyzing trace with hash 2138832335, now seen corresponding path program 1 times [2022-12-14 13:25:30,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:25:30,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514290710] [2022-12-14 13:25:30,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:25:30,053 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:25:30,078 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:25:30,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1861977207] [2022-12-14 13:25:30,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:25:30,078 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:25:30,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:25:30,080 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:25:30,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 13:25:30,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:25:30,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 13:25:30,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:25:30,209 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 16 proven. 73 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-12-14 13:25:30,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:25:30,258 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-12-14 13:25:30,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:25:30,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514290710] [2022-12-14 13:25:30,259 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:25:30,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861977207] [2022-12-14 13:25:30,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861977207] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:25:30,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1719051705] [2022-12-14 13:25:30,260 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-12-14 13:25:30,260 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:25:30,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:25:30,260 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:25:30,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:25:39,008 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-12-14 13:25:39,012 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:25:39,022 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:25:41,477 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5147#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 13:25:41,477 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:25:41,477 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:25:41,477 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-12-14 13:25:41,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600820404] [2022-12-14 13:25:41,478 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:25:41,478 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 13:25:41,478 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:25:41,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 13:25:41,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=722, Unknown=0, NotChecked=0, Total=930 [2022-12-14 13:25:41,479 INFO L87 Difference]: Start difference. First operand 228 states and 271 transitions. Second operand has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 7 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 6 states have call predecessors, (24), 6 states have call successors, (24) [2022-12-14 13:25:41,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:25:41,647 INFO L93 Difference]: Finished difference Result 372 states and 446 transitions. [2022-12-14 13:25:41,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 13:25:41,647 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 7 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 6 states have call predecessors, (24), 6 states have call successors, (24) Word has length 70 [2022-12-14 13:25:41,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:25:41,649 INFO L225 Difference]: With dead ends: 372 [2022-12-14 13:25:41,649 INFO L226 Difference]: Without dead ends: 352 [2022-12-14 13:25:41,650 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 177 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=266, Invalid=1066, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 13:25:41,650 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 94 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:25:41,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 288 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:25:41,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-12-14 13:25:41,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 336. [2022-12-14 13:25:41,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 209 states have (on average 1.1483253588516746) internal successors, (240), 218 states have internal predecessors, (240), 86 states have call successors, (86), 40 states have call predecessors, (86), 40 states have return successors, (81), 77 states have call predecessors, (81), 81 states have call successors, (81) [2022-12-14 13:25:41,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 407 transitions. [2022-12-14 13:25:41,693 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 407 transitions. Word has length 70 [2022-12-14 13:25:41,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:25:41,693 INFO L495 AbstractCegarLoop]: Abstraction has 336 states and 407 transitions. [2022-12-14 13:25:41,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 7 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 6 states have call predecessors, (24), 6 states have call successors, (24) [2022-12-14 13:25:41,693 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 407 transitions. [2022-12-14 13:25:41,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-12-14 13:25:41,694 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:25:41,694 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:25:41,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-12-14 13:25:41,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:25:41,896 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:25:41,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:25:41,896 INFO L85 PathProgramCache]: Analyzing trace with hash 1872706257, now seen corresponding path program 1 times [2022-12-14 13:25:41,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:25:41,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142405699] [2022-12-14 13:25:41,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:25:41,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:25:41,919 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:25:41,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [964856928] [2022-12-14 13:25:41,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:25:41,920 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:25:41,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:25:41,923 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:25:41,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 13:25:41,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:25:41,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 43 conjunts are in the unsatisfiable core [2022-12-14 13:25:41,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:25:42,361 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-12-14 13:25:42,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:25:43,115 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-12-14 13:25:43,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:25:43,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142405699] [2022-12-14 13:25:43,115 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:25:43,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964856928] [2022-12-14 13:25:43,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964856928] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:25:43,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [453390875] [2022-12-14 13:25:43,117 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-12-14 13:25:43,117 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:25:43,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:25:43,117 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:25:43,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:25:53,916 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 13:25:53,919 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:25:53,928 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:26:00,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6648#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 13:26:00,654 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:26:00,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:26:00,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-12-14 13:26:00,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48713143] [2022-12-14 13:26:00,654 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:26:00,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 13:26:00,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:26:00,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 13:26:00,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1632, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 13:26:00,655 INFO L87 Difference]: Start difference. First operand 336 states and 407 transitions. Second operand has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-12-14 13:26:16,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:26:16,001 INFO L93 Difference]: Finished difference Result 458 states and 584 transitions. [2022-12-14 13:26:16,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 13:26:16,001 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 71 [2022-12-14 13:26:16,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:26:16,004 INFO L225 Difference]: With dead ends: 458 [2022-12-14 13:26:16,004 INFO L226 Difference]: Without dead ends: 454 [2022-12-14 13:26:16,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1161 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=491, Invalid=3799, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 13:26:16,006 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 221 mSDsluCounter, 452 mSDsCounter, 0 mSdLazyCounter, 836 mSolverCounterSat, 258 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 534 SdHoareTripleChecker+Invalid, 1094 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 258 IncrementalHoareTripleChecker+Valid, 836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:26:16,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [225 Valid, 534 Invalid, 1094 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [258 Valid, 836 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2022-12-14 13:26:16,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2022-12-14 13:26:16,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 424. [2022-12-14 13:26:16,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 266 states have (on average 1.1879699248120301) internal successors, (316), 274 states have internal predecessors, (316), 113 states have call successors, (113), 45 states have call predecessors, (113), 44 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2022-12-14 13:26:16,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 537 transitions. [2022-12-14 13:26:16,102 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 537 transitions. Word has length 71 [2022-12-14 13:26:16,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:26:16,102 INFO L495 AbstractCegarLoop]: Abstraction has 424 states and 537 transitions. [2022-12-14 13:26:16,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-12-14 13:26:16,102 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 537 transitions. [2022-12-14 13:26:16,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-12-14 13:26:16,103 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:26:16,103 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:26:16,107 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 13:26:16,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 13:26:16,304 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:26:16,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:26:16,305 INFO L85 PathProgramCache]: Analyzing trace with hash -273783569, now seen corresponding path program 1 times [2022-12-14 13:26:16,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:26:16,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037077970] [2022-12-14 13:26:16,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:26:16,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:26:16,329 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:26:16,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1141673817] [2022-12-14 13:26:16,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:26:16,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:26:16,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:26:16,333 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:26:16,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 13:26:16,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:26:16,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 31 conjunts are in the unsatisfiable core [2022-12-14 13:26:16,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:26:16,820 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 35 proven. 20 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2022-12-14 13:26:16,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:26:17,039 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 40 proven. 7 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2022-12-14 13:26:17,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:26:17,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037077970] [2022-12-14 13:26:17,039 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:26:17,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1141673817] [2022-12-14 13:26:17,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1141673817] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:26:17,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [376624982] [2022-12-14 13:26:17,042 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-12-14 13:26:17,042 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:26:17,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:26:17,042 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:26:17,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:26:26,227 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-12-14 13:26:26,230 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:26:26,241 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:26:29,325 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8478#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 13:26:29,325 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:26:29,325 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:26:29,325 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 19 [2022-12-14 13:26:29,325 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174950156] [2022-12-14 13:26:29,325 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:26:29,326 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 13:26:29,326 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:26:29,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 13:26:29,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1367, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 13:26:29,327 INFO L87 Difference]: Start difference. First operand 424 states and 537 transitions. Second operand has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) [2022-12-14 13:26:34,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:26:34,288 INFO L93 Difference]: Finished difference Result 556 states and 710 transitions. [2022-12-14 13:26:34,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 13:26:34,289 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) Word has length 76 [2022-12-14 13:26:34,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:26:34,290 INFO L225 Difference]: With dead ends: 556 [2022-12-14 13:26:34,290 INFO L226 Difference]: Without dead ends: 522 [2022-12-14 13:26:34,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 194 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 839 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=309, Invalid=2241, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 13:26:34,292 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 102 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 750 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-12-14 13:26:34,292 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 299 Invalid, 855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 750 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-12-14 13:26:34,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2022-12-14 13:26:34,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 453. [2022-12-14 13:26:34,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 293 states have (on average 1.174061433447099) internal successors, (344), 300 states have internal predecessors, (344), 109 states have call successors, (109), 50 states have call predecessors, (109), 50 states have return successors, (105), 102 states have call predecessors, (105), 105 states have call successors, (105) [2022-12-14 13:26:34,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 558 transitions. [2022-12-14 13:26:34,389 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 558 transitions. Word has length 76 [2022-12-14 13:26:34,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:26:34,389 INFO L495 AbstractCegarLoop]: Abstraction has 453 states and 558 transitions. [2022-12-14 13:26:34,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) [2022-12-14 13:26:34,389 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 558 transitions. [2022-12-14 13:26:34,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-12-14 13:26:34,390 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:26:34,390 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:26:34,394 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 13:26:34,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 13:26:34,591 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:26:34,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:26:34,592 INFO L85 PathProgramCache]: Analyzing trace with hash 951211296, now seen corresponding path program 1 times [2022-12-14 13:26:34,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:26:34,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021344576] [2022-12-14 13:26:34,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:26:34,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:26:34,615 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:26:34,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1649170988] [2022-12-14 13:26:34,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:26:34,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:26:34,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:26:34,619 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:26:34,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 13:26:34,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:26:34,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 13:26:34,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:26:35,366 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 26 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2022-12-14 13:26:35,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:26:39,760 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 23 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2022-12-14 13:26:39,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:26:39,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021344576] [2022-12-14 13:26:39,761 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:26:39,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649170988] [2022-12-14 13:26:39,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649170988] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:26:39,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1212291214] [2022-12-14 13:26:39,762 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 13:26:39,762 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:26:39,762 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:26:39,762 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:26:39,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:26:48,843 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2022-12-14 13:26:48,860 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:26:48,869 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:00,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10538#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 11) (= |#NULL.base| 0))' at error location [2022-12-14 13:27:00,344 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:00,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:27:00,344 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 21 [2022-12-14 13:27:00,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767447873] [2022-12-14 13:27:00,345 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:00,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-12-14 13:27:00,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:00,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-12-14 13:27:00,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=1415, Unknown=2, NotChecked=0, Total=1640 [2022-12-14 13:27:00,346 INFO L87 Difference]: Start difference. First operand 453 states and 558 transitions. Second operand has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2022-12-14 13:27:03,587 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 [] [2022-12-14 13:27:12,386 WARN L233 SmtUtils]: Spent 5.65s on a formula simplification that was a NOOP. DAG size: 68 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:27:31,136 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:27:32,766 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:27:37,400 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:27:43,013 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:27:44,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:44,643 INFO L93 Difference]: Finished difference Result 584 states and 743 transitions. [2022-12-14 13:27:44,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 13:27:44,643 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) Word has length 88 [2022-12-14 13:27:44,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:44,645 INFO L225 Difference]: With dead ends: 584 [2022-12-14 13:27:44,645 INFO L226 Difference]: Without dead ends: 582 [2022-12-14 13:27:44,647 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 222 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1053 ImplicationChecksByTransitivity, 35.5s TimeCoverageRelationStatistics Valid=520, Invalid=2899, Unknown=3, NotChecked=0, Total=3422 [2022-12-14 13:27:44,647 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 137 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 919 mSolverCounterSat, 152 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 1075 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 919 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:44,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 252 Invalid, 1075 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 919 Invalid, 4 Unknown, 0 Unchecked, 21.6s Time] [2022-12-14 13:27:44,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2022-12-14 13:27:44,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 554. [2022-12-14 13:27:44,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 554 states, 362 states have (on average 1.1961325966850829) internal successors, (433), 370 states have internal predecessors, (433), 137 states have call successors, (137), 54 states have call predecessors, (137), 54 states have return successors, (133), 129 states have call predecessors, (133), 133 states have call successors, (133) [2022-12-14 13:27:44,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 554 states to 554 states and 703 transitions. [2022-12-14 13:27:44,828 INFO L78 Accepts]: Start accepts. Automaton has 554 states and 703 transitions. Word has length 88 [2022-12-14 13:27:44,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:44,829 INFO L495 AbstractCegarLoop]: Abstraction has 554 states and 703 transitions. [2022-12-14 13:27:44,829 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2022-12-14 13:27:44,829 INFO L276 IsEmpty]: Start isEmpty. Operand 554 states and 703 transitions. [2022-12-14 13:27:44,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-12-14 13:27:44,830 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:44,830 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:44,834 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 13:27:45,030 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 13:27:45,031 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:45,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:45,031 INFO L85 PathProgramCache]: Analyzing trace with hash 2091721655, now seen corresponding path program 2 times [2022-12-14 13:27:45,031 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:45,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57208792] [2022-12-14 13:27:45,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:45,032 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:45,041 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:27:45,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [436538150] [2022-12-14 13:27:45,041 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:27:45,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:45,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:45,042 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:45,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 13:27:45,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 13:27:45,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:27:45,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 13:27:45,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:45,107 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2022-12-14 13:27:45,108 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:27:45,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:45,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57208792] [2022-12-14 13:27:45,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:27:45,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436538150] [2022-12-14 13:27:45,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436538150] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:27:45,108 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:27:45,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 13:27:45,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125414299] [2022-12-14 13:27:45,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:27:45,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:27:45,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:45,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:27:45,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 13:27:45,110 INFO L87 Difference]: Start difference. First operand 554 states and 703 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-12-14 13:27:45,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:45,363 INFO L93 Difference]: Finished difference Result 722 states and 935 transitions. [2022-12-14 13:27:45,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 13:27:45,364 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 98 [2022-12-14 13:27:45,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:45,365 INFO L225 Difference]: With dead ends: 722 [2022-12-14 13:27:45,365 INFO L226 Difference]: Without dead ends: 519 [2022-12-14 13:27:45,366 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-12-14 13:27:45,366 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 12 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:45,367 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 147 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:27:45,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2022-12-14 13:27:45,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 494. [2022-12-14 13:27:45,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 494 states, 319 states have (on average 1.188087774294671) internal successors, (379), 327 states have internal predecessors, (379), 126 states have call successors, (126), 48 states have call predecessors, (126), 48 states have return successors, (123), 118 states have call predecessors, (123), 123 states have call successors, (123) [2022-12-14 13:27:45,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 628 transitions. [2022-12-14 13:27:45,529 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 628 transitions. Word has length 98 [2022-12-14 13:27:45,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:45,530 INFO L495 AbstractCegarLoop]: Abstraction has 494 states and 628 transitions. [2022-12-14 13:27:45,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-12-14 13:27:45,530 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 628 transitions. [2022-12-14 13:27:45,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-12-14 13:27:45,531 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:45,531 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:45,535 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 13:27:45,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 13:27:45,732 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:45,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:45,733 INFO L85 PathProgramCache]: Analyzing trace with hash 1839151106, now seen corresponding path program 1 times [2022-12-14 13:27:45,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:45,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014575869] [2022-12-14 13:27:45,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:45,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:45,741 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:27:45,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [714140681] [2022-12-14 13:27:45,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:45,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:45,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:45,742 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:45,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 13:27:45,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:27:45,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 15 conjunts are in the unsatisfiable core [2022-12-14 13:27:45,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:45,903 INFO L134 CoverageAnalysis]: Checked inductivity of 348 backedges. 35 proven. 229 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-12-14 13:27:45,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:45,996 INFO L134 CoverageAnalysis]: Checked inductivity of 348 backedges. 35 proven. 37 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-12-14 13:27:45,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:45,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014575869] [2022-12-14 13:27:45,997 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:27:45,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714140681] [2022-12-14 13:27:45,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714140681] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:45,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1959396421] [2022-12-14 13:27:45,999 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-12-14 13:27:45,999 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:45,999 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:45,999 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:45,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:27:50,690 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-12-14 13:27:50,693 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:27:50,704 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:27:52,793 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14956#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 13:27:52,793 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:27:52,793 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:27:52,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 14 [2022-12-14 13:27:52,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749106799] [2022-12-14 13:27:52,794 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:27:52,794 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 13:27:52,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:27:52,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 13:27:52,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=819, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 13:27:52,796 INFO L87 Difference]: Start difference. First operand 494 states and 628 transitions. Second operand has 14 states, 14 states have (on average 4.428571428571429) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 7 states have call predecessors, (32), 7 states have call successors, (32) [2022-12-14 13:27:53,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:27:53,217 INFO L93 Difference]: Finished difference Result 828 states and 1102 transitions. [2022-12-14 13:27:53,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 13:27:53,218 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.428571428571429) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 7 states have call predecessors, (32), 7 states have call successors, (32) Word has length 104 [2022-12-14 13:27:53,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:27:53,219 INFO L225 Difference]: With dead ends: 828 [2022-12-14 13:27:53,219 INFO L226 Difference]: Without dead ends: 708 [2022-12-14 13:27:53,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 275 SyntacticMatches, 4 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 627 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=331, Invalid=1309, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 13:27:53,220 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 107 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:27:53,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 272 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:27:53,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2022-12-14 13:27:53,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 692. [2022-12-14 13:27:53,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 692 states, 439 states have (on average 1.1685649202733486) internal successors, (513), 448 states have internal predecessors, (513), 188 states have call successors, (188), 64 states have call predecessors, (188), 64 states have return successors, (183), 179 states have call predecessors, (183), 183 states have call successors, (183) [2022-12-14 13:27:53,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 692 states to 692 states and 884 transitions. [2022-12-14 13:27:53,457 INFO L78 Accepts]: Start accepts. Automaton has 692 states and 884 transitions. Word has length 104 [2022-12-14 13:27:53,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:27:53,457 INFO L495 AbstractCegarLoop]: Abstraction has 692 states and 884 transitions. [2022-12-14 13:27:53,458 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.428571428571429) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 7 states have call predecessors, (32), 7 states have call successors, (32) [2022-12-14 13:27:53,458 INFO L276 IsEmpty]: Start isEmpty. Operand 692 states and 884 transitions. [2022-12-14 13:27:53,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-12-14 13:27:53,458 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:27:53,458 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:27:53,462 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 13:27:53,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 13:27:53,660 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:27:53,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:27:53,660 INFO L85 PathProgramCache]: Analyzing trace with hash -580720248, now seen corresponding path program 2 times [2022-12-14 13:27:53,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:27:53,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500121573] [2022-12-14 13:27:53,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:27:53,661 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:27:53,673 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:27:53,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1795554303] [2022-12-14 13:27:53,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:27:53,674 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:27:53,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:27:53,674 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:27:53,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 13:27:53,861 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 13:27:53,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:27:53,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 45 conjunts are in the unsatisfiable core [2022-12-14 13:27:53,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:27:54,243 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 31 proven. 39 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-12-14 13:27:54,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:27:54,863 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 28 proven. 39 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-12-14 13:27:54,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:27:54,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500121573] [2022-12-14 13:27:54,864 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:27:54,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795554303] [2022-12-14 13:27:54,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1795554303] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:27:54,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1400675408] [2022-12-14 13:27:54,866 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 13:27:54,866 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:27:54,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:27:54,866 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:27:54,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:04,540 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-12-14 13:28:04,543 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:28:04,553 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:08,095 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17885#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 11) (= |#NULL.base| 0))' at error location [2022-12-14 13:28:08,096 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:08,096 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:28:08,096 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 19 [2022-12-14 13:28:08,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141336533] [2022-12-14 13:28:08,096 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:08,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 13:28:08,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:08,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 13:28:08,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1285, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 13:28:08,097 INFO L87 Difference]: Start difference. First operand 692 states and 884 transitions. Second operand has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2022-12-14 13:28:25,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:28:25,358 INFO L93 Difference]: Finished difference Result 981 states and 1297 transitions. [2022-12-14 13:28:25,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 13:28:25,358 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) Word has length 106 [2022-12-14 13:28:25,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:28:25,362 INFO L225 Difference]: With dead ends: 981 [2022-12-14 13:28:25,362 INFO L226 Difference]: Without dead ends: 979 [2022-12-14 13:28:25,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 275 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1562 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=695, Invalid=4417, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 13:28:25,364 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 130 mSDsluCounter, 568 mSDsCounter, 0 mSdLazyCounter, 1113 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 679 SdHoareTripleChecker+Invalid, 1264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 1113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:28:25,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 679 Invalid, 1264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 1113 Invalid, 0 Unknown, 0 Unchecked, 8.1s Time] [2022-12-14 13:28:25,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 979 states. [2022-12-14 13:28:25,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 979 to 918. [2022-12-14 13:28:25,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 918 states, 577 states have (on average 1.197573656845754) internal successors, (691), 586 states have internal predecessors, (691), 260 states have call successors, (260), 80 states have call predecessors, (260), 80 states have return successors, (255), 251 states have call predecessors, (255), 255 states have call successors, (255) [2022-12-14 13:28:25,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 918 states to 918 states and 1206 transitions. [2022-12-14 13:28:25,749 INFO L78 Accepts]: Start accepts. Automaton has 918 states and 1206 transitions. Word has length 106 [2022-12-14 13:28:25,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:28:25,750 INFO L495 AbstractCegarLoop]: Abstraction has 918 states and 1206 transitions. [2022-12-14 13:28:25,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2022-12-14 13:28:25,750 INFO L276 IsEmpty]: Start isEmpty. Operand 918 states and 1206 transitions. [2022-12-14 13:28:25,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-12-14 13:28:25,751 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:28:25,751 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:28:25,756 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 13:28:25,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 13:28:25,953 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:28:25,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:28:25,954 INFO L85 PathProgramCache]: Analyzing trace with hash -186342166, now seen corresponding path program 3 times [2022-12-14 13:28:25,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:28:25,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792548330] [2022-12-14 13:28:25,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:28:25,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:28:25,982 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:28:25,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [106548322] [2022-12-14 13:28:25,983 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:28:25,984 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:28:25,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:28:25,987 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:28:25,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 13:28:26,043 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:28:26,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:28:26,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 59 conjunts are in the unsatisfiable core [2022-12-14 13:28:26,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:28:26,650 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 28 proven. 49 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-12-14 13:28:26,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:28:28,608 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-12-14 13:28:28,608 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:28:28,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792548330] [2022-12-14 13:28:28,608 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:28:28,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106548322] [2022-12-14 13:28:28,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106548322] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:28:28,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1468332127] [2022-12-14 13:28:28,610 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 13:28:28,610 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:28:28,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:28:28,611 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:28:28,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:28:37,659 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-12-14 13:28:37,661 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:28:37,671 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:28:41,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21474#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 11) (= |#NULL.base| 0))' at error location [2022-12-14 13:28:41,659 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:28:41,659 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:28:41,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 24 [2022-12-14 13:28:41,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087248095] [2022-12-14 13:28:41,659 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:28:41,660 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 13:28:41,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:28:41,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 13:28:41,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1656, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 13:28:41,662 INFO L87 Difference]: Start difference. First operand 918 states and 1206 transitions. Second operand has 24 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 21 states have internal predecessors, (57), 12 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 12 states have call predecessors, (36), 12 states have call successors, (36) [2022-12-14 13:29:03,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:29:03,371 INFO L93 Difference]: Finished difference Result 1233 states and 1652 transitions. [2022-12-14 13:29:03,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 13:29:03,372 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 21 states have internal predecessors, (57), 12 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 12 states have call predecessors, (36), 12 states have call successors, (36) Word has length 110 [2022-12-14 13:29:03,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:29:03,375 INFO L225 Difference]: With dead ends: 1233 [2022-12-14 13:29:03,375 INFO L226 Difference]: Without dead ends: 1229 [2022-12-14 13:29:03,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 282 SyntacticMatches, 4 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1946 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=831, Invalid=4869, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 13:29:03,377 INFO L413 NwaCegarLoop]: 99 mSDtfsCounter, 198 mSDsluCounter, 477 mSDsCounter, 0 mSdLazyCounter, 1213 mSolverCounterSat, 278 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 576 SdHoareTripleChecker+Invalid, 1491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 1213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2022-12-14 13:29:03,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [202 Valid, 576 Invalid, 1491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 1213 Invalid, 0 Unknown, 0 Unchecked, 8.8s Time] [2022-12-14 13:29:03,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1229 states. [2022-12-14 13:29:03,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1229 to 1159. [2022-12-14 13:29:03,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1159 states, 728 states have (on average 1.2156593406593406) internal successors, (885), 737 states have internal predecessors, (885), 332 states have call successors, (332), 99 states have call predecessors, (332), 98 states have return successors, (327), 322 states have call predecessors, (327), 327 states have call successors, (327) [2022-12-14 13:29:03,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1159 states to 1159 states and 1544 transitions. [2022-12-14 13:29:03,988 INFO L78 Accepts]: Start accepts. Automaton has 1159 states and 1544 transitions. Word has length 110 [2022-12-14 13:29:03,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:29:03,988 INFO L495 AbstractCegarLoop]: Abstraction has 1159 states and 1544 transitions. [2022-12-14 13:29:03,988 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 21 states have internal predecessors, (57), 12 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 12 states have call predecessors, (36), 12 states have call successors, (36) [2022-12-14 13:29:03,988 INFO L276 IsEmpty]: Start isEmpty. Operand 1159 states and 1544 transitions. [2022-12-14 13:29:03,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-12-14 13:29:03,990 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:29:03,990 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:29:03,995 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 13:29:04,190 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:04,192 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:29:04,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:29:04,193 INFO L85 PathProgramCache]: Analyzing trace with hash 1791411503, now seen corresponding path program 3 times [2022-12-14 13:29:04,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:29:04,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093308509] [2022-12-14 13:29:04,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:29:04,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:29:04,219 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:29:04,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2087137331] [2022-12-14 13:29:04,220 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:29:04,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:29:04,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:29:04,224 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:29:04,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 13:29:04,318 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:29:04,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:29:04,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 13:29:04,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:29:04,968 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 73 proven. 59 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2022-12-14 13:29:04,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:29:07,211 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 73 proven. 56 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2022-12-14 13:29:07,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:29:07,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093308509] [2022-12-14 13:29:07,212 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:29:07,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087137331] [2022-12-14 13:29:07,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087137331] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:29:07,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [881189799] [2022-12-14 13:29:07,213 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-12-14 13:29:07,213 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:29:07,213 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:29:07,213 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:29:07,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:29:19,445 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 13:29:19,449 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:29:19,459 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:29:30,920 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25871#(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 [2022-12-14 13:29:30,920 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:29:30,920 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:29:30,920 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 30 [2022-12-14 13:29:30,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970931263] [2022-12-14 13:29:30,921 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:29:30,921 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 13:29:30,921 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:29:30,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 13:29:30,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=2465, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 13:29:30,922 INFO L87 Difference]: Start difference. First operand 1159 states and 1544 transitions. Second operand has 30 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 states have internal predecessors, (64), 15 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 13 states have call predecessors, (40), 13 states have call successors, (40) [2022-12-14 13:30:10,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:30:10,092 INFO L93 Difference]: Finished difference Result 1305 states and 1743 transitions. [2022-12-14 13:30:10,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-12-14 13:30:10,093 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 states have internal predecessors, (64), 15 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 13 states have call predecessors, (40), 13 states have call successors, (40) Word has length 121 [2022-12-14 13:30:10,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:30:10,096 INFO L225 Difference]: With dead ends: 1305 [2022-12-14 13:30:10,096 INFO L226 Difference]: Without dead ends: 1284 [2022-12-14 13:30:10,097 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 308 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3028 ImplicationChecksByTransitivity, 31.8s TimeCoverageRelationStatistics Valid=1276, Invalid=8230, Unknown=0, NotChecked=0, Total=9506 [2022-12-14 13:30:10,098 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 261 mSDsluCounter, 424 mSDsCounter, 0 mSdLazyCounter, 1802 mSolverCounterSat, 373 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 488 SdHoareTripleChecker+Invalid, 2175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 373 IncrementalHoareTripleChecker+Valid, 1802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:30:10,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 488 Invalid, 2175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [373 Valid, 1802 Invalid, 0 Unknown, 0 Unchecked, 19.6s Time] [2022-12-14 13:30:10,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1284 states. [2022-12-14 13:30:10,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1284 to 1252. [2022-12-14 13:30:10,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1252 states, 785 states have (on average 1.2114649681528662) internal successors, (951), 794 states have internal predecessors, (951), 360 states have call successors, (360), 106 states have call predecessors, (360), 106 states have return successors, (357), 351 states have call predecessors, (357), 357 states have call successors, (357) [2022-12-14 13:30:10,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1252 states to 1252 states and 1668 transitions. [2022-12-14 13:30:10,929 INFO L78 Accepts]: Start accepts. Automaton has 1252 states and 1668 transitions. Word has length 121 [2022-12-14 13:30:10,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:30:10,929 INFO L495 AbstractCegarLoop]: Abstraction has 1252 states and 1668 transitions. [2022-12-14 13:30:10,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 states have internal predecessors, (64), 15 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 13 states have call predecessors, (40), 13 states have call successors, (40) [2022-12-14 13:30:10,929 INFO L276 IsEmpty]: Start isEmpty. Operand 1252 states and 1668 transitions. [2022-12-14 13:30:10,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-12-14 13:30:10,931 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:30:10,931 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:30:10,935 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 13:30:11,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:11,132 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:30:11,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:30:11,133 INFO L85 PathProgramCache]: Analyzing trace with hash -505343358, now seen corresponding path program 4 times [2022-12-14 13:30:11,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:30:11,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917931435] [2022-12-14 13:30:11,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:30:11,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:30:11,158 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:30:11,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1605241488] [2022-12-14 13:30:11,159 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:30:11,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:11,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:30:11,160 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:30:11,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 13:30:12,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:30:12,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 82 conjunts are in the unsatisfiable core [2022-12-14 13:30:12,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:30:21,802 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 131 proven. 89 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2022-12-14 13:30:21,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:30:26,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:30:26,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917931435] [2022-12-14 13:30:26,266 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:30:26,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605241488] [2022-12-14 13:30:26,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605241488] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:30:26,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1802559175] [2022-12-14 13:30:26,267 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 13:30:26,267 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:30:26,267 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:30:26,267 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:30:26,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:30:33,980 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-12-14 13:30:33,983 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:30:33,992 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:30:43,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30539#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 11) (= |#NULL.base| 0))' at error location [2022-12-14 13:30:43,145 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:30:43,145 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:30:43,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-12-14 13:30:43,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202422757] [2022-12-14 13:30:43,145 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-12-14 13:30:43,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 13:30:43,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:30:43,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 13:30:43,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=2377, Unknown=1, NotChecked=0, Total=2756 [2022-12-14 13:30:43,147 INFO L87 Difference]: Start difference. First operand 1252 states and 1668 transitions. Second operand has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 9 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 9 states have call predecessors, (23), 9 states have call successors, (23) [2022-12-14 13:30:47,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:30:47,308 INFO L93 Difference]: Finished difference Result 1291 states and 1698 transitions. [2022-12-14 13:30:47,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 13:30:47,309 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 9 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 9 states have call predecessors, (23), 9 states have call successors, (23) Word has length 138 [2022-12-14 13:30:47,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:30:47,312 INFO L225 Difference]: With dead ends: 1291 [2022-12-14 13:30:47,312 INFO L226 Difference]: Without dead ends: 1289 [2022-12-14 13:30:47,313 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 319 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1417 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=506, Invalid=3275, Unknown=1, NotChecked=0, Total=3782 [2022-12-14 13:30:47,314 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 63 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 1178 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 1246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 1178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:30:47,314 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 370 Invalid, 1246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 1178 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-12-14 13:30:47,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1289 states. [2022-12-14 13:30:48,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1289 to 1284. [2022-12-14 13:30:48,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1284 states, 809 states have (on average 1.203955500618047) internal successors, (974), 818 states have internal predecessors, (974), 360 states have call successors, (360), 114 states have call predecessors, (360), 114 states have return successors, (357), 351 states have call predecessors, (357), 357 states have call successors, (357) [2022-12-14 13:30:48,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1284 states to 1284 states and 1691 transitions. [2022-12-14 13:30:48,068 INFO L78 Accepts]: Start accepts. Automaton has 1284 states and 1691 transitions. Word has length 138 [2022-12-14 13:30:48,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:30:48,068 INFO L495 AbstractCegarLoop]: Abstraction has 1284 states and 1691 transitions. [2022-12-14 13:30:48,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 9 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 9 states have call predecessors, (23), 9 states have call successors, (23) [2022-12-14 13:30:48,069 INFO L276 IsEmpty]: Start isEmpty. Operand 1284 states and 1691 transitions. [2022-12-14 13:30:48,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-12-14 13:30:48,070 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:30:48,070 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:30:48,077 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 13:30:48,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 13:30:48,271 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:30:48,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:30:48,272 INFO L85 PathProgramCache]: Analyzing trace with hash 1374549507, now seen corresponding path program 2 times [2022-12-14 13:30:48,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:30:48,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009313454] [2022-12-14 13:30:48,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:30:48,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:30:48,300 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:30:48,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [424340694] [2022-12-14 13:30:48,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:30:48,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:30:48,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:30:48,305 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:30:48,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 13:30:48,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 13:30:48,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:30:48,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 19 conjunts are in the unsatisfiable core [2022-12-14 13:30:48,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:30:48,518 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 40 proven. 728 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-12-14 13:30:48,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:30:48,623 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 40 proven. 88 refuted. 0 times theorem prover too weak. 772 trivial. 0 not checked. [2022-12-14 13:30:48,623 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:30:48,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009313454] [2022-12-14 13:30:48,623 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:30:48,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424340694] [2022-12-14 13:30:48,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424340694] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:30:48,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1550226657] [2022-12-14 13:30:48,624 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-12-14 13:30:48,625 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:30:48,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:30:48,625 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:30:48,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:30:57,784 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-12-14 13:30:57,787 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:30:57,798 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:31:00,002 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35287#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-12-14 13:31:00,002 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:31:00,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:31:00,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 14 [2022-12-14 13:31:00,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305939087] [2022-12-14 13:31:00,003 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:31:00,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 13:31:00,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:31:00,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 13:31:00,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=813, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 13:31:00,005 INFO L87 Difference]: Start difference. First operand 1284 states and 1691 transitions. Second operand has 14 states, 14 states have (on average 5.785714285714286) internal successors, (81), 14 states have internal predecessors, (81), 11 states have call successors, (49), 8 states have call predecessors, (49), 7 states have return successors, (48), 10 states have call predecessors, (48), 10 states have call successors, (48) [2022-12-14 13:31:00,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:31:00,984 INFO L93 Difference]: Finished difference Result 1319 states and 1731 transitions. [2022-12-14 13:31:00,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 13:31:00,985 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 5.785714285714286) internal successors, (81), 14 states have internal predecessors, (81), 11 states have call successors, (49), 8 states have call predecessors, (49), 7 states have return successors, (48), 10 states have call predecessors, (48), 10 states have call successors, (48) Word has length 147 [2022-12-14 13:31:00,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:31:00,988 INFO L225 Difference]: With dead ends: 1319 [2022-12-14 13:31:00,988 INFO L226 Difference]: Without dead ends: 1307 [2022-12-14 13:31:00,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 395 SyntacticMatches, 13 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=340, Invalid=1300, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 13:31:00,989 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 41 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:31:00,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 336 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:31:00,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1307 states. [2022-12-14 13:31:01,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1307 to 1305. [2022-12-14 13:31:01,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1305 states, 830 states have (on average 1.1927710843373494) internal successors, (990), 839 states have internal predecessors, (990), 360 states have call successors, (360), 114 states have call predecessors, (360), 114 states have return successors, (357), 351 states have call predecessors, (357), 357 states have call successors, (357) [2022-12-14 13:31:01,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1305 states to 1305 states and 1707 transitions. [2022-12-14 13:31:01,788 INFO L78 Accepts]: Start accepts. Automaton has 1305 states and 1707 transitions. Word has length 147 [2022-12-14 13:31:01,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:31:01,788 INFO L495 AbstractCegarLoop]: Abstraction has 1305 states and 1707 transitions. [2022-12-14 13:31:01,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 5.785714285714286) internal successors, (81), 14 states have internal predecessors, (81), 11 states have call successors, (49), 8 states have call predecessors, (49), 7 states have return successors, (48), 10 states have call predecessors, (48), 10 states have call successors, (48) [2022-12-14 13:31:01,788 INFO L276 IsEmpty]: Start isEmpty. Operand 1305 states and 1707 transitions. [2022-12-14 13:31:01,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-12-14 13:31:01,791 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:31:01,791 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:31:01,795 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 13:31:01,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:31:01,992 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:31:01,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:31:01,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1228502390, now seen corresponding path program 5 times [2022-12-14 13:31:01,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:31:01,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16966966] [2022-12-14 13:31:01,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:31:01,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:31:02,026 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:31:02,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [25381902] [2022-12-14 13:31:02,027 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:31:02,027 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:31:02,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:31:02,029 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:31:02,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 13:31:02,885 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 13:31:02,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:31:02,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 73 conjunts are in the unsatisfiable core [2022-12-14 13:31:02,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:31:04,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 164 proven. 100 refuted. 0 times theorem prover too weak. 916 trivial. 0 not checked. [2022-12-14 13:31:04,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:31:12,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:31:12,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16966966] [2022-12-14 13:31:12,514 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:31:12,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25381902] [2022-12-14 13:31:12,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25381902] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:31:12,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1995269960] [2022-12-14 13:31:12,515 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 13:31:12,515 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:31:12,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:31:12,515 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:31:12,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:31:22,195 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-12-14 13:31:22,198 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:31:22,210 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:31:33,790 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39934#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 11) (= |#NULL.base| 0))' at error location [2022-12-14 13:31:33,790 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:31:33,790 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:31:33,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2022-12-14 13:31:33,790 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340820985] [2022-12-14 13:31:33,790 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-12-14 13:31:33,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 13:31:33,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:31:33,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 13:31:33,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=1856, Unknown=3, NotChecked=0, Total=2162 [2022-12-14 13:31:33,791 INFO L87 Difference]: Start difference. First operand 1305 states and 1707 transitions. Second operand has 17 states, 16 states have (on average 2.25) internal successors, (36), 14 states have internal predecessors, (36), 8 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 8 states have call successors, (19) [2022-12-14 13:31:36,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:31:36,254 INFO L93 Difference]: Finished difference Result 1402 states and 1818 transitions. [2022-12-14 13:31:36,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 13:31:36,255 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 14 states have internal predecessors, (36), 8 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 8 states have call successors, (19) Word has length 161 [2022-12-14 13:31:36,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:31:36,259 INFO L225 Difference]: With dead ends: 1402 [2022-12-14 13:31:36,259 INFO L226 Difference]: Without dead ends: 1398 [2022-12-14 13:31:36,260 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 343 SyntacticMatches, 6 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1167 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=377, Invalid=2376, Unknown=3, NotChecked=0, Total=2756 [2022-12-14 13:31:36,261 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 49 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 730 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 767 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:31:36,261 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 269 Invalid, 767 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 730 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 13:31:36,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1398 states. [2022-12-14 13:31:37,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1398 to 1391. [2022-12-14 13:31:37,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1391 states, 890 states have (on average 1.1876404494382022) internal successors, (1057), 897 states have internal predecessors, (1057), 376 states have call successors, (376), 125 states have call predecessors, (376), 124 states have return successors, (373), 368 states have call predecessors, (373), 373 states have call successors, (373) [2022-12-14 13:31:37,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1391 states to 1391 states and 1806 transitions. [2022-12-14 13:31:37,085 INFO L78 Accepts]: Start accepts. Automaton has 1391 states and 1806 transitions. Word has length 161 [2022-12-14 13:31:37,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:31:37,085 INFO L495 AbstractCegarLoop]: Abstraction has 1391 states and 1806 transitions. [2022-12-14 13:31:37,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 14 states have internal predecessors, (36), 8 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 8 states have call successors, (19) [2022-12-14 13:31:37,085 INFO L276 IsEmpty]: Start isEmpty. Operand 1391 states and 1806 transitions. [2022-12-14 13:31:37,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2022-12-14 13:31:37,087 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:31:37,087 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:31:37,092 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 13:31:37,287 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:31:37,288 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:31:37,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:31:37,289 INFO L85 PathProgramCache]: Analyzing trace with hash -2043533228, now seen corresponding path program 6 times [2022-12-14 13:31:37,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:31:37,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338088529] [2022-12-14 13:31:37,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:31:37,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:31:37,308 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:31:37,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1568706929] [2022-12-14 13:31:37,309 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:31:37,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:31:37,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:31:37,310 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:31:37,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 13:31:37,403 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:31:37,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:31:37,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 106 conjunts are in the unsatisfiable core [2022-12-14 13:31:37,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:31:39,388 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 251 proven. 189 refuted. 0 times theorem prover too weak. 751 trivial. 0 not checked. [2022-12-14 13:31:39,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:32:19,332 WARN L233 SmtUtils]: Spent 7.84s on a formula simplification that was a NOOP. DAG size: 52 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:32:24,652 WARN L859 $PredicateComparison]: unable to prove that (let ((.cse8 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse9 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse10 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse11 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|)) (.cse4 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse5 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse6 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|)) (.cse7 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse0 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse12 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|)) (.cse13 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse2 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse3 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|))) (or (not (= (+ .cse0 .cse1) (+ |c_ULTIMATE.start_main_~c~0#1| .cse2 .cse3))) (not (= (+ .cse4 .cse5 .cse6 .cse7) (+ .cse8 .cse9 .cse10 .cse11))) (= (+ .cse8 .cse9 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~q~0#1|) .cse10 .cse11 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~s~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|) .cse4 .cse5 .cse6 .cse7 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (not (= (+ .cse12 .cse13) |c_ULTIMATE.start_main_~b~0#1|)) (<= |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~c~0#1|) (<= (+ (* 2 .cse0) (* 2 .cse1)) (+ .cse12 .cse13 (* 2 .cse2) (* 2 .cse3))))) is different from true [2022-12-14 13:32:25,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 308 proven. 63 refuted. 0 times theorem prover too weak. 818 trivial. 2 not checked. [2022-12-14 13:32:25,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:32:25,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338088529] [2022-12-14 13:32:25,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:32:25,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568706929] [2022-12-14 13:32:25,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568706929] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:32:25,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1996633516] [2022-12-14 13:32:25,247 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 13:32:25,247 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:32:25,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:32:25,248 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:32:25,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:32:34,365 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2022-12-14 13:32:34,372 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:32:34,383 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:33:04,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45106#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 11) (= |#NULL.base| 0))' at error location [2022-12-14 13:33:04,084 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:33:04,084 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:33:04,084 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 15] total 32 [2022-12-14 13:33:04,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124298348] [2022-12-14 13:33:04,084 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:33:04,084 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 13:33:04,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:33:04,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 13:33:04,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=348, Invalid=2192, Unknown=14, NotChecked=98, Total=2652 [2022-12-14 13:33:04,085 INFO L87 Difference]: Start difference. First operand 1391 states and 1806 transitions. Second operand has 32 states, 29 states have (on average 2.586206896551724) internal successors, (75), 25 states have internal predecessors, (75), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (47), 17 states have call predecessors, (47), 14 states have call successors, (47) [2022-12-14 13:33:07,314 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:09,414 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:11,077 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:12,845 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:16,063 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:18,069 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:20,759 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:22,950 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:24,069 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:27,243 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:29,294 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:33,214 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:35,506 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:33:48,208 WARN L233 SmtUtils]: Spent 11.91s on a formula simplification. DAG size of input: 59 DAG size of output: 58 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:34:01,716 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:34:03,876 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:34:07,723 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:34:16,054 WARN L233 SmtUtils]: Spent 7.12s on a formula simplification. DAG size of input: 59 DAG size of output: 58 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:34:19,036 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:34:21,329 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:34:29,966 WARN L233 SmtUtils]: Spent 6.17s on a formula simplification. DAG size of input: 59 DAG size of output: 58 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:34:32,675 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:34:43,617 WARN L233 SmtUtils]: Spent 5.34s on a formula simplification. DAG size of input: 58 DAG size of output: 57 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:34:53,384 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:34:55,387 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:34:57,167 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:34:59,191 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:01,194 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:03,197 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:05,588 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:13,993 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:16,112 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:26,079 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:28,081 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:30,676 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:35,065 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:37,544 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:40,697 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:47,881 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:51,132 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.23s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:53,169 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:35:59,924 WARN L233 SmtUtils]: Spent 5.59s on a formula simplification that was a NOOP. DAG size: 69 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:36:02,598 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:36:04,174 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:36:08,459 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:36:19,377 WARN L233 SmtUtils]: Spent 8.07s on a formula simplification that was a NOOP. DAG size: 55 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:36:21,590 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:36:23,754 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:36:26,113 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:36:28,115 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:36:44,331 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:37:00,340 WARN L233 SmtUtils]: Spent 12.25s on a formula simplification. DAG size of input: 70 DAG size of output: 69 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:37:02,357 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:37:04,359 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 13:37:04,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:37:04,495 INFO L93 Difference]: Finished difference Result 1601 states and 2111 transitions. [2022-12-14 13:37:04,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 13:37:04,497 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 2.586206896551724) internal successors, (75), 25 states have internal predecessors, (75), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (47), 17 states have call predecessors, (47), 14 states have call successors, (47) Word has length 165 [2022-12-14 13:37:04,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:37:04,500 INFO L225 Difference]: With dead ends: 1601 [2022-12-14 13:37:04,500 INFO L226 Difference]: Without dead ends: 1599 [2022-12-14 13:37:04,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 543 GetRequests, 453 SyntacticMatches, 13 SemanticMatches, 77 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2198 ImplicationChecksByTransitivity, 182.1s TimeCoverageRelationStatistics Valid=1017, Invalid=4972, Unknown=21, NotChecked=152, Total=6162 [2022-12-14 13:37:04,501 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 193 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 1762 mSolverCounterSat, 196 mSolverCounterUnsat, 40 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 119.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 2198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 1762 IncrementalHoareTripleChecker+Invalid, 40 IncrementalHoareTripleChecker+Unknown, 200 IncrementalHoareTripleChecker+Unchecked, 119.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:37:04,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 496 Invalid, 2198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 1762 Invalid, 40 Unknown, 200 Unchecked, 119.3s Time] [2022-12-14 13:37:04,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1599 states. [2022-12-14 13:37:05,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1599 to 1553. [2022-12-14 13:37:05,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1553 states, 986 states have (on average 1.2038539553752536) internal successors, (1187), 994 states have internal predecessors, (1187), 430 states have call successors, (430), 137 states have call predecessors, (430), 136 states have return successors, (427), 421 states have call predecessors, (427), 427 states have call successors, (427) [2022-12-14 13:37:05,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1553 states to 1553 states and 2044 transitions. [2022-12-14 13:37:05,586 INFO L78 Accepts]: Start accepts. Automaton has 1553 states and 2044 transitions. Word has length 165 [2022-12-14 13:37:05,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:37:05,586 INFO L495 AbstractCegarLoop]: Abstraction has 1553 states and 2044 transitions. [2022-12-14 13:37:05,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 2.586206896551724) internal successors, (75), 25 states have internal predecessors, (75), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (47), 17 states have call predecessors, (47), 14 states have call successors, (47) [2022-12-14 13:37:05,586 INFO L276 IsEmpty]: Start isEmpty. Operand 1553 states and 2044 transitions. [2022-12-14 13:37:05,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2022-12-14 13:37:05,588 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:37:05,588 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:37:05,593 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 13:37:05,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 13:37:05,789 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:37:05,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:37:05,790 INFO L85 PathProgramCache]: Analyzing trace with hash 267407283, now seen corresponding path program 4 times [2022-12-14 13:37:05,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:37:05,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132943456] [2022-12-14 13:37:05,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:37:05,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:37:05,816 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 13:37:05,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1493685808] [2022-12-14 13:37:05,816 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:37:05,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:37:05,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:37:05,820 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:37:05,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2c370817-9ada-45be-baec-27f4f2092bfe/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 13:37:05,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:37:05,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 73 conjunts are in the unsatisfiable core [2022-12-14 13:37:05,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:37:06,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1279 backedges. 48 proven. 118 refuted. 0 times theorem prover too weak. 1113 trivial. 0 not checked. [2022-12-14 13:37:06,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:37:15,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1279 backedges. 48 proven. 115 refuted. 0 times theorem prover too weak. 1116 trivial. 0 not checked. [2022-12-14 13:37:15,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:37:15,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132943456] [2022-12-14 13:37:15,887 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 13:37:15,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493685808] [2022-12-14 13:37:15,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493685808] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:37:15,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [53385627] [2022-12-14 13:37:15,889 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-12-14 13:37:15,889 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:37:15,889 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:37:15,889 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:37:15,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:37:25,585 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 19 iterations. Over-approximation may be very coarse. [2022-12-14 13:37:34,353 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 13:37:34,357 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-12-14 13:37:34,368 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:37:58,155 WARN L233 SmtUtils]: Spent 17.95s on a formula simplification. DAG size of input: 158 DAG size of output: 139 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 13:38:11,556 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50902#(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 [2022-12-14 13:38:11,556 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:38:11,556 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 13:38:11,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 30 [2022-12-14 13:38:11,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478538127] [2022-12-14 13:38:11,556 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 13:38:11,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 13:38:11,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:38:11,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 13:38:11,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=2486, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 13:38:11,558 INFO L87 Difference]: Start difference. First operand 1553 states and 2044 transitions. Second operand has 30 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 27 states have internal predecessors, (71), 18 states have call successors, (57), 3 states have call predecessors, (57), 2 states have return successors, (56), 16 states have call predecessors, (56), 16 states have call successors, (56) [2022-12-14 13:38:44,603 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []