./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b 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_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9 --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 776d32abf1ae3b62e7ad4a02cd7c02c0cc6433852a1fe73b7d30c6e216da832a --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 19:45:28,979 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 19:45:28,981 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 19:45:29,010 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 19:45:29,011 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 19:45:29,014 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 19:45:29,017 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 19:45:29,021 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 19:45:29,023 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 19:45:29,029 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 19:45:29,030 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 19:45:29,033 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 19:45:29,033 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 19:45:29,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 19:45:29,037 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 19:45:29,039 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 19:45:29,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 19:45:29,042 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 19:45:29,046 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 19:45:29,053 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 19:45:29,055 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 19:45:29,059 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 19:45:29,060 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 19:45:29,061 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 19:45:29,069 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 19:45:29,070 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 19:45:29,070 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 19:45:29,073 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 19:45:29,074 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 19:45:29,076 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 19:45:29,077 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 19:45:29,078 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 19:45:29,079 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 19:45:29,082 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 19:45:29,083 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 19:45:29,083 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 19:45:29,083 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 19:45:29,084 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 19:45:29,084 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 19:45:29,085 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 19:45:29,085 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 19:45:29,086 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 19:45:29,125 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 19:45:29,125 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 19:45:29,126 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 19:45:29,126 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 19:45:29,127 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 19:45:29,127 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 19:45:29,127 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 19:45:29,127 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 19:45:29,128 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 19:45:29,128 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 19:45:29,129 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 19:45:29,129 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 19:45:29,129 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 19:45:29,129 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 19:45:29,130 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 19:45:29,130 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 19:45:29,130 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 19:45:29,130 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 19:45:29,131 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 19:45:29,131 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 19:45:29,131 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 19:45:29,131 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 19:45:29,132 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 19:45:29,132 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 19:45:29,132 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 19:45:29,132 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 19:45:29,133 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 19:45:29,133 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 19:45:29,133 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 19:45:29,134 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 19:45:29,134 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 19:45:29,134 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 19:45:29,134 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 19:45:29,135 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 19:45:29,135 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 19:45:29,135 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 19:45:29,135 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 19:45:29,135 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 19:45:29,135 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 19:45:29,136 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 19:45:29,136 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 19:45:29,136 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_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 776d32abf1ae3b62e7ad4a02cd7c02c0cc6433852a1fe73b7d30c6e216da832a [2022-11-20 19:45:29,423 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 19:45:29,444 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 19:45:29,446 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 19:45:29,447 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 19:45:29,448 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 19:45:29,449 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c [2022-11-20 19:45:32,519 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 19:45:32,717 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 19:45:32,718 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c [2022-11-20 19:45:32,724 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/data/e33df591e/4593bc2ed124482b94e853b89f1907ba/FLAG1bd16a500 [2022-11-20 19:45:32,742 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/data/e33df591e/4593bc2ed124482b94e853b89f1907ba [2022-11-20 19:45:32,744 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 19:45:32,746 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 19:45:32,747 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 19:45:32,748 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 19:45:32,751 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 19:45:32,752 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:45:32" (1/1) ... [2022-11-20 19:45:32,753 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@322b94ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:32, skipping insertion in model container [2022-11-20 19:45:32,754 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:45:32" (1/1) ... [2022-11-20 19:45:32,761 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 19:45:32,778 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 19:45:33,009 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_82af046d-5fb4-43d6-98d9-ef629f536f38/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c[490,503] [2022-11-20 19:45:33,031 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 19:45:33,040 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 19:45:33,052 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_82af046d-5fb4-43d6-98d9-ef629f536f38/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c[490,503] [2022-11-20 19:45:33,062 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 19:45:33,075 INFO L208 MainTranslator]: Completed translation [2022-11-20 19:45:33,076 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33 WrapperNode [2022-11-20 19:45:33,076 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 19:45:33,077 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 19:45:33,077 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 19:45:33,078 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 19:45:33,085 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,092 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,111 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2022-11-20 19:45:33,112 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 19:45:33,113 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 19:45:33,113 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 19:45:33,113 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 19:45:33,123 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,124 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,138 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,139 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,142 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,146 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,147 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,148 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,150 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 19:45:33,151 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 19:45:33,151 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 19:45:33,151 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 19:45:33,152 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (1/1) ... [2022-11-20 19:45:33,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 19:45:33,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:45:33,193 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 19:45:33,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 19:45:33,246 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 19:45:33,247 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-20 19:45:33,247 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-20 19:45:33,247 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 19:45:33,247 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 19:45:33,248 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 19:45:33,248 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-20 19:45:33,248 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-20 19:45:33,328 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 19:45:33,330 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 19:45:33,481 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 19:45:33,507 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 19:45:33,507 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-20 19:45:33,510 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:45:33 BoogieIcfgContainer [2022-11-20 19:45:33,522 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 19:45:33,525 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 19:45:33,525 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 19:45:33,529 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 19:45:33,529 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 07:45:32" (1/3) ... [2022-11-20 19:45:33,530 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1791eb79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:45:33, skipping insertion in model container [2022-11-20 19:45:33,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:45:33" (2/3) ... [2022-11-20 19:45:33,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1791eb79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:45:33, skipping insertion in model container [2022-11-20 19:45:33,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:45:33" (3/3) ... [2022-11-20 19:45:33,532 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound10.c [2022-11-20 19:45:33,563 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 19:45:33,563 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 19:45:33,618 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 19:45:33,632 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;@6a881e8c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 19:45:33,633 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 19:45:33,638 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-20 19:45:33,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-20 19:45:33,649 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:45:33,649 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:45:33,652 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:45:33,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:45:33,660 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2022-11-20 19:45:33,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:45:33,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631833386] [2022-11-20 19:45:33,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:33,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:45:33,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:45:33,878 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:45:33,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631833386] [2022-11-20 19:45:33,880 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-20 19:45:33,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918742752] [2022-11-20 19:45:33,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:33,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:33,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:45:33,885 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:45:33,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 19:45:34,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:45:34,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-20 19:45:34,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:45:34,062 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-20 19:45:34,063 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:45:34,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918742752] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:45:34,063 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:45:34,064 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 19:45:34,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907474825] [2022-11-20 19:45:34,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:45:34,084 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-20 19:45:34,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:45:34,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-20 19:45:34,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-20 19:45:34,130 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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) [2022-11-20 19:45:34,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:45:34,194 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2022-11-20 19:45:34,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-20 19:45:34,204 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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 [2022-11-20 19:45:34,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:45:34,212 INFO L225 Difference]: With dead ends: 51 [2022-11-20 19:45:34,213 INFO L226 Difference]: Without dead ends: 28 [2022-11-20 19:45:34,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-20 19:45:34,224 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 19:45:34,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 19:45:34,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-20 19:45:34,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-20 19:45:34,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-20 19:45:34,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2022-11-20 19:45:34,278 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2022-11-20 19:45:34,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:45:34,282 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2022-11-20 19:45:34,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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) [2022-11-20 19:45:34,283 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2022-11-20 19:45:34,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-20 19:45:34,285 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:45:34,285 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:45:34,296 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-20 19:45:34,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-20 19:45:34,492 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:45:34,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:45:34,495 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2022-11-20 19:45:34,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:45:34,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291790169] [2022-11-20 19:45:34,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:34,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:45:34,548 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:45:34,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1571196845] [2022-11-20 19:45:34,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:34,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:34,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:45:34,558 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:45:34,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 19:45:34,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:45:34,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-20 19:45:34,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:45:34,784 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-20 19:45:34,784 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:45:34,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:45:34,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291790169] [2022-11-20 19:45:34,785 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:45:34,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571196845] [2022-11-20 19:45:34,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1571196845] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:45:34,785 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:45:34,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-20 19:45:34,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768531824] [2022-11-20 19:45:34,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:45:34,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 19:45:34,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:45:34,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 19:45:34,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 19:45:34,788 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-20 19:45:34,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:45:34,936 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-11-20 19:45:34,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 19:45:34,937 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2022-11-20 19:45:34,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:45:34,938 INFO L225 Difference]: With dead ends: 47 [2022-11-20 19:45:34,939 INFO L226 Difference]: Without dead ends: 40 [2022-11-20 19:45:34,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 19:45:34,940 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 30 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:45:34,941 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 78 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 19:45:34,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-20 19:45:34,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2022-11-20 19:45:34,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-20 19:45:34,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-11-20 19:45:34,951 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2022-11-20 19:45:34,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:45:34,952 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-11-20 19:45:34,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-20 19:45:34,952 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-11-20 19:45:34,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-20 19:45:34,953 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:45:34,954 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, 1] [2022-11-20 19:45:34,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 19:45:35,159 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:35,160 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:45:35,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:45:35,161 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2022-11-20 19:45:35,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:45:35,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796236007] [2022-11-20 19:45:35,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:35,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:45:35,182 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:45:35,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1926362985] [2022-11-20 19:45:35,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:35,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:35,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:45:35,184 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:45:35,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 19:45:35,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:45:35,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 19:45:35,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:45:35,456 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-20 19:45:35,456 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:45:35,457 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:45:35,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796236007] [2022-11-20 19:45:35,457 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:45:35,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926362985] [2022-11-20 19:45:35,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926362985] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:45:35,458 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:45:35,458 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-20 19:45:35,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744306502] [2022-11-20 19:45:35,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:45:35,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 19:45:35,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:45:35,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 19:45:35,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-20 19:45:35,461 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-20 19:45:35,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:45:35,586 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-11-20 19:45:35,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 19:45:35,587 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2022-11-20 19:45:35,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:45:35,589 INFO L225 Difference]: With dead ends: 46 [2022-11-20 19:45:35,589 INFO L226 Difference]: Without dead ends: 44 [2022-11-20 19:45:35,590 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-20 19:45:35,591 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 31 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:45:35,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 114 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 19:45:35,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-20 19:45:35,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-20 19:45:35,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-20 19:45:35,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2022-11-20 19:45:35,605 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2022-11-20 19:45:35,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:45:35,606 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2022-11-20 19:45:35,607 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-20 19:45:35,607 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2022-11-20 19:45:35,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-20 19:45:35,608 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:45:35,608 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] [2022-11-20 19:45:35,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-20 19:45:35,813 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:35,814 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:45:35,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:45:35,814 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2022-11-20 19:45:35,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:45:35,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266087858] [2022-11-20 19:45:35,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:35,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:45:35,896 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:45:35,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [65865532] [2022-11-20 19:45:35,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:35,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:35,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:45:35,899 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:45:35,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 19:45:35,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:45:35,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 19:45:35,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:45:36,054 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-20 19:45:36,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:45:36,172 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-20 19:45:36,172 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:45:36,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266087858] [2022-11-20 19:45:36,173 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:45:36,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65865532] [2022-11-20 19:45:36,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65865532] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:45:36,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1350265850] [2022-11-20 19:45:36,201 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-20 19:45:36,201 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:45:36,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:45:36,218 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:45:36,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:45:37,197 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:45:37,235 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:45:39,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1350265850] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:45:39,218 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:45:39,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2022-11-20 19:45:39,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652200155] [2022-11-20 19:45:39,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:45:39,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-20 19:45:39,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:45:39,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-20 19:45:39,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-20 19:45:39,221 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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) [2022-11-20 19:45:39,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:45:39,582 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2022-11-20 19:45:39,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 19:45:39,583 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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 26 [2022-11-20 19:45:39,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:45:39,584 INFO L225 Difference]: With dead ends: 71 [2022-11-20 19:45:39,584 INFO L226 Difference]: Without dead ends: 64 [2022-11-20 19:45:39,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-20 19:45:39,586 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 57 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 19:45:39,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 58 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 19:45:39,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-20 19:45:39,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2022-11-20 19:45:39,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-20 19:45:39,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2022-11-20 19:45:39,635 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2022-11-20 19:45:39,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:45:39,636 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2022-11-20 19:45:39,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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) [2022-11-20 19:45:39,636 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2022-11-20 19:45:39,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-20 19:45:39,638 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:45:39,639 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, 1] [2022-11-20 19:45:39,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-20 19:45:39,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:39,845 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:45:39,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:45:39,846 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2022-11-20 19:45:39,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:45:39,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623563714] [2022-11-20 19:45:39,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:39,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:45:39,860 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:45:39,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [678132619] [2022-11-20 19:45:39,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:39,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:39,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:45:39,868 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:45:39,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 19:45:39,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:45:39,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 19:45:39,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:45:40,033 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-20 19:45:40,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:45:40,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:45:40,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623563714] [2022-11-20 19:45:40,117 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:45:40,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678132619] [2022-11-20 19:45:40,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678132619] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 19:45:40,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [621076139] [2022-11-20 19:45:40,121 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-20 19:45:40,121 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:45:40,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:45:40,122 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:45:40,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:45:40,611 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-20 19:45:40,621 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:45:40,640 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:45:42,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [621076139] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:45:42,084 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 19:45:42,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7] total 20 [2022-11-20 19:45:42,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452812851] [2022-11-20 19:45:42,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:45:42,086 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-20 19:45:42,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:45:42,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-20 19:45:42,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-20 19:45:42,087 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-20 19:45:42,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:45:42,534 INFO L93 Difference]: Finished difference Result 72 states and 97 transitions. [2022-11-20 19:45:42,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-20 19:45:42,535 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 29 [2022-11-20 19:45:42,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:45:42,536 INFO L225 Difference]: With dead ends: 72 [2022-11-20 19:45:42,537 INFO L226 Difference]: Without dead ends: 70 [2022-11-20 19:45:42,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-20 19:45:42,548 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 103 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 19:45:42,548 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 57 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 19:45:42,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-20 19:45:42,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 65. [2022-11-20 19:45:42,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 21 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-20 19:45:42,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2022-11-20 19:45:42,596 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 29 [2022-11-20 19:45:42,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:45:42,597 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2022-11-20 19:45:42,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-20 19:45:42,599 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2022-11-20 19:45:42,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-20 19:45:42,599 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:45:42,600 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:45:42,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 19:45:42,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:42,805 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:45:42,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:45:42,806 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2022-11-20 19:45:42,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:45:42,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70618976] [2022-11-20 19:45:42,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:42,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:45:42,827 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:45:42,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1555150389] [2022-11-20 19:45:42,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:42,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:42,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:45:42,833 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:45:42,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 19:45:42,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:45:42,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-20 19:45:42,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:45:43,050 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-20 19:45:43,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:45:43,235 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-20 19:45:43,236 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:45:43,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70618976] [2022-11-20 19:45:43,236 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:45:43,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555150389] [2022-11-20 19:45:43,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1555150389] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:45:43,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1567004072] [2022-11-20 19:45:43,239 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-20 19:45:43,239 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:45:43,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:45:43,240 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:45:43,240 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:45:43,928 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-20 19:45:43,935 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:45:43,955 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:45:46,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1567004072] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:45:46,410 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:45:46,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [8, 6] total 26 [2022-11-20 19:45:46,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688645022] [2022-11-20 19:45:46,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:45:46,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-20 19:45:46,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:45:46,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-20 19:45:46,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-20 19:45:46,413 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 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) [2022-11-20 19:45:46,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:45:46,909 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2022-11-20 19:45:46,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 19:45:46,910 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 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 29 [2022-11-20 19:45:46,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:45:46,911 INFO L225 Difference]: With dead ends: 96 [2022-11-20 19:45:46,912 INFO L226 Difference]: Without dead ends: 94 [2022-11-20 19:45:46,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-20 19:45:46,913 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 86 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 19:45:46,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 56 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 19:45:46,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-20 19:45:46,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-11-20 19:45:46,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.196078431372549) internal successors, (61), 54 states have internal predecessors, (61), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-20 19:45:46,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2022-11-20 19:45:46,989 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 29 [2022-11-20 19:45:46,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:45:46,991 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2022-11-20 19:45:46,991 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 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) [2022-11-20 19:45:46,991 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2022-11-20 19:45:47,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-20 19:45:47,002 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:45:47,002 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, 1, 1] [2022-11-20 19:45:47,014 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-20 19:45:47,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:47,208 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:45:47,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:45:47,209 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2022-11-20 19:45:47,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:45:47,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887752297] [2022-11-20 19:45:47,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:47,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:45:47,230 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:45:47,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [439047073] [2022-11-20 19:45:47,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:45:47,231 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:45:47,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:45:47,236 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:45:47,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 19:45:47,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:45:47,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-20 19:45:47,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:45:48,262 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-20 19:45:48,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:45:49,557 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-20 19:45:49,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:45:49,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887752297] [2022-11-20 19:45:49,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:45:49,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439047073] [2022-11-20 19:45:49,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439047073] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:45:49,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1409807816] [2022-11-20 19:45:49,561 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-20 19:45:49,562 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:45:49,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:45:49,562 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:45:49,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:45:56,040 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 19:45:56,044 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:45:56,057 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:46:07,931 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2087#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:46:07,931 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:46:07,931 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:46:07,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 26 [2022-11-20 19:46:07,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518018222] [2022-11-20 19:46:07,931 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:46:07,932 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-20 19:46:07,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:46:07,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-20 19:46:07,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1853, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 19:46:07,934 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-20 19:46:24,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:46:24,787 INFO L93 Difference]: Finished difference Result 218 states and 311 transitions. [2022-11-20 19:46:24,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-20 19:46:24,788 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) Word has length 51 [2022-11-20 19:46:24,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:46:24,791 INFO L225 Difference]: With dead ends: 218 [2022-11-20 19:46:24,791 INFO L226 Difference]: Without dead ends: 180 [2022-11-20 19:46:24,793 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1552 ImplicationChecksByTransitivity, 22.4s TimeCoverageRelationStatistics Valid=554, Invalid=4276, Unknown=0, NotChecked=0, Total=4830 [2022-11-20 19:46:24,794 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 151 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 1506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:46:24,794 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 196 Invalid, 1506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 7.2s Time] [2022-11-20 19:46:24,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-11-20 19:46:24,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 137. [2022-11-20 19:46:24,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 87 states have (on average 1.2413793103448276) internal successors, (108), 88 states have internal predecessors, (108), 41 states have call successors, (41), 8 states have call predecessors, (41), 8 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2022-11-20 19:46:24,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 189 transitions. [2022-11-20 19:46:24,912 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 189 transitions. Word has length 51 [2022-11-20 19:46:24,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:46:24,913 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 189 transitions. [2022-11-20 19:46:24,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-20 19:46:24,913 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 189 transitions. [2022-11-20 19:46:24,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-20 19:46:24,914 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:46:24,915 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 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, 1, 1, 1, 1] [2022-11-20 19:46:24,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-20 19:46:25,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:46:25,120 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:46:25,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:46:25,121 INFO L85 PathProgramCache]: Analyzing trace with hash -900294476, now seen corresponding path program 1 times [2022-11-20 19:46:25,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:46:25,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17838469] [2022-11-20 19:46:25,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:46:25,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:46:25,139 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:46:25,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1845902973] [2022-11-20 19:46:25,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:46:25,143 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:46:25,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:46:25,144 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:46:25,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-20 19:46:25,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:46:25,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-20 19:46:25,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:46:25,252 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-20 19:46:25,252 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:46:25,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:46:25,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17838469] [2022-11-20 19:46:25,252 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:46:25,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845902973] [2022-11-20 19:46:25,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845902973] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:46:25,253 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:46:25,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-20 19:46:25,253 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478681945] [2022-11-20 19:46:25,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:46:25,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 19:46:25,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:46:25,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 19:46:25,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-20 19:46:25,259 INFO L87 Difference]: Start difference. First operand 137 states and 189 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 19:46:25,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:46:25,422 INFO L93 Difference]: Finished difference Result 229 states and 321 transitions. [2022-11-20 19:46:25,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 19:46:25,422 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2022-11-20 19:46:25,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:46:25,424 INFO L225 Difference]: With dead ends: 229 [2022-11-20 19:46:25,424 INFO L226 Difference]: Without dead ends: 166 [2022-11-20 19:46:25,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-20 19:46:25,426 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 4 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 19:46:25,426 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 84 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 19:46:25,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-11-20 19:46:25,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 155. [2022-11-20 19:46:25,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 93 states have (on average 1.2365591397849462) internal successors, (115), 94 states have internal predecessors, (115), 53 states have call successors, (53), 8 states have call predecessors, (53), 8 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-20 19:46:25,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 220 transitions. [2022-11-20 19:46:25,543 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 220 transitions. Word has length 54 [2022-11-20 19:46:25,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:46:25,545 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 220 transitions. [2022-11-20 19:46:25,545 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 19:46:25,546 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 220 transitions. [2022-11-20 19:46:25,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-20 19:46:25,549 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:46:25,549 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 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] [2022-11-20 19:46:25,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-20 19:46:25,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:46:25,755 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:46:25,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:46:25,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2022-11-20 19:46:25,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:46:25,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523156102] [2022-11-20 19:46:25,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:46:25,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:46:25,783 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:46:25,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1406626480] [2022-11-20 19:46:25,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:46:25,784 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:46:25,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:46:25,789 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:46:25,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-20 19:46:25,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:46:25,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-20 19:46:25,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:46:26,032 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 25 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-20 19:46:26,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:46:26,172 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-20 19:46:26,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:46:26,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523156102] [2022-11-20 19:46:26,173 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:46:26,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406626480] [2022-11-20 19:46:26,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406626480] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:46:26,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1022051616] [2022-11-20 19:46:26,175 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-20 19:46:26,175 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:46:26,176 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:46:26,176 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:46:26,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:46:32,544 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 19:46:32,548 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:46:32,562 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:46:34,510 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3853#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:46:34,510 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:46:34,510 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:46:34,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 14 [2022-11-20 19:46:34,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794557351] [2022-11-20 19:46:34,510 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:46:34,511 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-20 19:46:34,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:46:34,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-20 19:46:34,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2022-11-20 19:46:34,512 INFO L87 Difference]: Start difference. First operand 155 states and 220 transitions. Second operand has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-20 19:46:35,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:46:35,080 INFO L93 Difference]: Finished difference Result 198 states and 272 transitions. [2022-11-20 19:46:35,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 19:46:35,081 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) Word has length 61 [2022-11-20 19:46:35,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:46:35,082 INFO L225 Difference]: With dead ends: 198 [2022-11-20 19:46:35,083 INFO L226 Difference]: Without dead ends: 196 [2022-11-20 19:46:35,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 148 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=180, Invalid=1152, Unknown=0, NotChecked=0, Total=1332 [2022-11-20 19:46:35,084 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 65 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 19:46:35,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 111 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 19:46:35,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-20 19:46:35,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 167. [2022-11-20 19:46:35,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 103 states have internal predecessors, (124), 53 states have call successors, (53), 11 states have call predecessors, (53), 11 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-20 19:46:35,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 229 transitions. [2022-11-20 19:46:35,220 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 229 transitions. Word has length 61 [2022-11-20 19:46:35,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:46:35,220 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 229 transitions. [2022-11-20 19:46:35,220 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-20 19:46:35,221 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 229 transitions. [2022-11-20 19:46:35,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-20 19:46:35,222 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:46:35,222 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 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, 1, 1] [2022-11-20 19:46:35,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-20 19:46:35,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-20 19:46:35,435 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:46:35,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:46:35,435 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 2 times [2022-11-20 19:46:35,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:46:35,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307287296] [2022-11-20 19:46:35,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:46:35,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:46:35,447 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:46:35,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [465286027] [2022-11-20 19:46:35,447 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:46:35,447 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:46:35,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:46:35,448 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:46:35,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-20 19:46:35,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 19:46:35,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:46:35,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-20 19:46:35,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:46:36,075 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-20 19:46:36,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:46:36,687 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-20 19:46:36,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:46:36,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307287296] [2022-11-20 19:46:36,688 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:46:36,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465286027] [2022-11-20 19:46:36,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465286027] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:46:36,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1710326159] [2022-11-20 19:46:36,690 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-20 19:46:36,690 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:46:36,691 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:46:36,691 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:46:36,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:46:42,750 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-20 19:46:42,811 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:46:42,823 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:46:47,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4824#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:46:47,293 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:46:47,293 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:46:47,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-20 19:46:47,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444060393] [2022-11-20 19:46:47,294 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:46:47,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-20 19:46:47,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:46:47,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-20 19:46:47,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1765, Unknown=0, NotChecked=0, Total=1980 [2022-11-20 19:46:47,296 INFO L87 Difference]: Start difference. First operand 167 states and 229 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-20 19:47:06,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:47:06,940 INFO L93 Difference]: Finished difference Result 450 states and 637 transitions. [2022-11-20 19:47:06,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-20 19:47:06,940 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 59 [2022-11-20 19:47:06,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:47:06,943 INFO L225 Difference]: With dead ends: 450 [2022-11-20 19:47:06,943 INFO L226 Difference]: Without dead ends: 379 [2022-11-20 19:47:06,945 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 126 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2139 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=781, Invalid=5225, Unknown=0, NotChecked=0, Total=6006 [2022-11-20 19:47:06,945 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 314 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 1155 mSolverCounterSat, 346 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 1501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 346 IncrementalHoareTripleChecker+Valid, 1155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.7s IncrementalHoareTripleChecker+Time [2022-11-20 19:47:06,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 376 Invalid, 1501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [346 Valid, 1155 Invalid, 0 Unknown, 0 Unchecked, 10.7s Time] [2022-11-20 19:47:06,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2022-11-20 19:47:07,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 248. [2022-11-20 19:47:07,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 156 states have (on average 1.2243589743589745) internal successors, (191), 157 states have internal predecessors, (191), 77 states have call successors, (77), 14 states have call predecessors, (77), 14 states have return successors, (76), 76 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-20 19:47:07,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 344 transitions. [2022-11-20 19:47:07,116 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 344 transitions. Word has length 59 [2022-11-20 19:47:07,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:47:07,116 INFO L495 AbstractCegarLoop]: Abstraction has 248 states and 344 transitions. [2022-11-20 19:47:07,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-20 19:47:07,117 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 344 transitions. [2022-11-20 19:47:07,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-20 19:47:07,117 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:47:07,118 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 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, 1, 1] [2022-11-20 19:47:07,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-20 19:47:07,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-20 19:47:07,319 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:47:07,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:47:07,319 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 3 times [2022-11-20 19:47:07,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:47:07,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452355720] [2022-11-20 19:47:07,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:47:07,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:47:07,329 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:47:07,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [904088906] [2022-11-20 19:47:07,330 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:47:07,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:47:07,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:47:07,331 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:47:07,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-20 19:47:07,398 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:47:07,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:47:07,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-20 19:47:07,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:47:07,455 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-20 19:47:07,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:47:07,532 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-20 19:47:07,532 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:47:07,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452355720] [2022-11-20 19:47:07,533 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:47:07,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904088906] [2022-11-20 19:47:07,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904088906] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:47:07,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1666409981] [2022-11-20 19:47:07,535 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-20 19:47:07,535 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:47:07,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:47:07,535 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:47:07,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:47:13,453 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-20 19:47:13,504 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:47:13,515 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:47:16,638 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6355#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:47:16,639 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:47:16,639 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:47:16,639 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-11-20 19:47:16,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060478727] [2022-11-20 19:47:16,639 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:47:16,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-20 19:47:16,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:47:16,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-20 19:47:16,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2022-11-20 19:47:16,641 INFO L87 Difference]: Start difference. First operand 248 states and 344 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-20 19:47:17,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:47:17,212 INFO L93 Difference]: Finished difference Result 357 states and 500 transitions. [2022-11-20 19:47:17,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-20 19:47:17,213 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2022-11-20 19:47:17,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:47:17,215 INFO L225 Difference]: With dead ends: 357 [2022-11-20 19:47:17,215 INFO L226 Difference]: Without dead ends: 259 [2022-11-20 19:47:17,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=244, Invalid=1562, Unknown=0, NotChecked=0, Total=1806 [2022-11-20 19:47:17,217 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 83 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:47:17,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 196 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 19:47:17,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-20 19:47:17,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 229. [2022-11-20 19:47:17,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 141 states have (on average 1.1914893617021276) internal successors, (168), 142 states have internal predecessors, (168), 73 states have call successors, (73), 14 states have call predecessors, (73), 14 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2022-11-20 19:47:17,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 313 transitions. [2022-11-20 19:47:17,361 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 313 transitions. Word has length 59 [2022-11-20 19:47:17,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:47:17,361 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 313 transitions. [2022-11-20 19:47:17,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-20 19:47:17,361 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 313 transitions. [2022-11-20 19:47:17,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-20 19:47:17,362 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:47:17,362 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 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] [2022-11-20 19:47:17,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-20 19:47:17,568 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-20 19:47:17,568 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:47:17,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:47:17,569 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2022-11-20 19:47:17,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:47:17,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515717981] [2022-11-20 19:47:17,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:47:17,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:47:17,579 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:47:17,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2035076444] [2022-11-20 19:47:17,580 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 19:47:17,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:47:17,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:47:17,581 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:47:17,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-20 19:47:17,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:47:17,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 19:47:17,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:47:17,781 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2022-11-20 19:47:17,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:47:17,870 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-20 19:47:17,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:47:17,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515717981] [2022-11-20 19:47:17,871 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:47:17,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035076444] [2022-11-20 19:47:17,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035076444] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-20 19:47:17,871 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 19:47:17,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2022-11-20 19:47:17,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681210977] [2022-11-20 19:47:17,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:47:17,872 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 19:47:17,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:47:17,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 19:47:17,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-20 19:47:17,873 INFO L87 Difference]: Start difference. First operand 229 states and 313 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-20 19:47:18,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:47:18,213 INFO L93 Difference]: Finished difference Result 261 states and 358 transitions. [2022-11-20 19:47:18,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 19:47:18,213 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2022-11-20 19:47:18,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:47:18,216 INFO L225 Difference]: With dead ends: 261 [2022-11-20 19:47:18,216 INFO L226 Difference]: Without dead ends: 259 [2022-11-20 19:47:18,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-20 19:47:18,217 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 19:47:18,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 105 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 19:47:18,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-20 19:47:18,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 255. [2022-11-20 19:47:18,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 153 states have (on average 1.196078431372549) internal successors, (183), 154 states have internal predecessors, (183), 85 states have call successors, (85), 16 states have call predecessors, (85), 16 states have return successors, (84), 84 states have call predecessors, (84), 84 states have call successors, (84) [2022-11-20 19:47:18,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 352 transitions. [2022-11-20 19:47:18,473 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 352 transitions. Word has length 64 [2022-11-20 19:47:18,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:47:18,474 INFO L495 AbstractCegarLoop]: Abstraction has 255 states and 352 transitions. [2022-11-20 19:47:18,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-20 19:47:18,474 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 352 transitions. [2022-11-20 19:47:18,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-20 19:47:18,475 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:47:18,475 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 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] [2022-11-20 19:47:18,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-20 19:47:18,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:47:18,678 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:47:18,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:47:18,678 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2022-11-20 19:47:18,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:47:18,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885574683] [2022-11-20 19:47:18,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:47:18,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:47:18,685 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:47:18,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1190562353] [2022-11-20 19:47:18,686 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:47:18,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:47:18,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:47:18,687 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:47:18,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-20 19:47:18,751 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 19:47:18,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:47:18,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-20 19:47:18,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:47:19,504 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 13 proven. 22 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-20 19:47:19,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:47:20,586 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-20 19:47:20,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:47:20,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885574683] [2022-11-20 19:47:20,586 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:47:20,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190562353] [2022-11-20 19:47:20,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190562353] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:47:20,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1777062610] [2022-11-20 19:47:20,589 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-20 19:47:20,589 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:47:20,589 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:47:20,590 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:47:20,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:47:26,601 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-20 19:47:26,657 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:47:26,669 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:47:34,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8914#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:47:34,116 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:47:34,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:47:34,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-20 19:47:34,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012655925] [2022-11-20 19:47:34,117 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:47:34,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-20 19:47:34,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:47:34,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-20 19:47:34,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1768, Unknown=0, NotChecked=0, Total=1980 [2022-11-20 19:47:34,118 INFO L87 Difference]: Start difference. First operand 255 states and 352 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-20 19:48:01,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:48:01,052 INFO L93 Difference]: Finished difference Result 395 states and 560 transitions. [2022-11-20 19:48:01,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-20 19:48:01,053 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 64 [2022-11-20 19:48:01,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:48:01,056 INFO L225 Difference]: With dead ends: 395 [2022-11-20 19:48:01,056 INFO L226 Difference]: Without dead ends: 393 [2022-11-20 19:48:01,057 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 140 SyntacticMatches, 7 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1783 ImplicationChecksByTransitivity, 24.3s TimeCoverageRelationStatistics Valid=654, Invalid=4316, Unknown=0, NotChecked=0, Total=4970 [2022-11-20 19:48:01,058 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 310 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 1101 mSolverCounterSat, 390 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 1491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 390 IncrementalHoareTripleChecker+Valid, 1101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.6s IncrementalHoareTripleChecker+Time [2022-11-20 19:48:01,058 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [310 Valid, 369 Invalid, 1491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [390 Valid, 1101 Invalid, 0 Unknown, 0 Unchecked, 10.6s Time] [2022-11-20 19:48:01,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2022-11-20 19:48:01,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 342. [2022-11-20 19:48:01,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 202 states have (on average 1.2128712871287128) internal successors, (245), 203 states have internal predecessors, (245), 121 states have call successors, (121), 18 states have call predecessors, (121), 18 states have return successors, (120), 120 states have call predecessors, (120), 120 states have call successors, (120) [2022-11-20 19:48:01,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 486 transitions. [2022-11-20 19:48:01,321 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 486 transitions. Word has length 64 [2022-11-20 19:48:01,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:48:01,321 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 486 transitions. [2022-11-20 19:48:01,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-20 19:48:01,322 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 486 transitions. [2022-11-20 19:48:01,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-20 19:48:01,323 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:48:01,324 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:48:01,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-20 19:48:01,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:48:01,530 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:48:01,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:48:01,531 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2022-11-20 19:48:01,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:48:01,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823063375] [2022-11-20 19:48:01,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:48:01,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:48:01,542 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:48:01,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [777910720] [2022-11-20 19:48:01,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:48:01,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:48:01,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:48:01,544 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:48:01,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-20 19:48:01,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:48:01,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-20 19:48:01,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:48:02,722 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-11-20 19:48:02,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:48:04,439 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 16 proven. 19 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-20 19:48:04,439 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:48:04,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823063375] [2022-11-20 19:48:04,439 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:48:04,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777910720] [2022-11-20 19:48:04,439 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777910720] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:48:04,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1419631399] [2022-11-20 19:48:04,441 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-20 19:48:04,442 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:48:04,442 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:48:04,442 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:48:04,442 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:48:09,813 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 19:48:09,817 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:48:09,829 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:48:19,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10640#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:48:19,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:48:19,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:48:19,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 29 [2022-11-20 19:48:19,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884870734] [2022-11-20 19:48:19,978 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:48:19,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-20 19:48:19,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:48:19,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-20 19:48:19,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1857, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 19:48:19,981 INFO L87 Difference]: Start difference. First operand 342 states and 486 transitions. Second operand has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) [2022-11-20 19:49:29,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:49:29,429 INFO L93 Difference]: Finished difference Result 489 states and 696 transitions. [2022-11-20 19:49:29,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-20 19:49:29,430 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) Word has length 78 [2022-11-20 19:49:29,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:49:29,433 INFO L225 Difference]: With dead ends: 489 [2022-11-20 19:49:29,433 INFO L226 Difference]: Without dead ends: 485 [2022-11-20 19:49:29,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 179 SyntacticMatches, 9 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4022 ImplicationChecksByTransitivity, 60.5s TimeCoverageRelationStatistics Valid=1517, Invalid=10255, Unknown=0, NotChecked=0, Total=11772 [2022-11-20 19:49:29,437 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 319 mSDsluCounter, 532 mSDsCounter, 0 mSdLazyCounter, 2187 mSolverCounterSat, 595 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 623 SdHoareTripleChecker+Invalid, 2782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 595 IncrementalHoareTripleChecker+Valid, 2187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.9s IncrementalHoareTripleChecker+Time [2022-11-20 19:49:29,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 623 Invalid, 2782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [595 Valid, 2187 Invalid, 0 Unknown, 0 Unchecked, 19.9s Time] [2022-11-20 19:49:29,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2022-11-20 19:49:29,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 441. [2022-11-20 19:49:29,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 253 states have (on average 1.225296442687747) internal successors, (310), 254 states have internal predecessors, (310), 165 states have call successors, (165), 22 states have call predecessors, (165), 22 states have return successors, (164), 164 states have call predecessors, (164), 164 states have call successors, (164) [2022-11-20 19:49:29,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 639 transitions. [2022-11-20 19:49:29,952 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 639 transitions. Word has length 78 [2022-11-20 19:49:29,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:49:29,952 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 639 transitions. [2022-11-20 19:49:29,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) [2022-11-20 19:49:29,953 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 639 transitions. [2022-11-20 19:49:29,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-20 19:49:29,955 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:49:29,955 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:49:29,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-20 19:49:30,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-20 19:49:30,162 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:49:30,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:49:30,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2022-11-20 19:49:30,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:49:30,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018098420] [2022-11-20 19:49:30,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:49:30,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:49:30,173 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:49:30,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [640932116] [2022-11-20 19:49:30,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:49:30,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:49:30,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:49:30,175 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:49:30,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-20 19:49:30,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:49:30,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-20 19:49:30,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:49:30,589 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-20 19:49:30,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:49:31,471 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2022-11-20 19:49:31,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:49:31,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018098420] [2022-11-20 19:49:31,471 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:49:31,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640932116] [2022-11-20 19:49:31,472 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640932116] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:49:31,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1573764528] [2022-11-20 19:49:31,474 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-20 19:49:31,474 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:49:31,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:49:31,475 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:49:31,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:49:33,650 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-11-20 19:49:33,691 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:49:33,705 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:49:36,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12760#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:49:36,906 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:49:36,906 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:49:36,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2022-11-20 19:49:36,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885627170] [2022-11-20 19:49:36,907 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:49:36,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-20 19:49:36,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:49:36,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-20 19:49:36,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1235, Unknown=0, NotChecked=0, Total=1406 [2022-11-20 19:49:36,908 INFO L87 Difference]: Start difference. First operand 441 states and 639 transitions. Second operand has 21 states, 20 states have (on average 1.9) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-20 19:49:43,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:49:43,846 INFO L93 Difference]: Finished difference Result 1040 states and 1644 transitions. [2022-11-20 19:49:43,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-20 19:49:43,847 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 81 [2022-11-20 19:49:43,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:49:43,854 INFO L225 Difference]: With dead ends: 1040 [2022-11-20 19:49:43,854 INFO L226 Difference]: Without dead ends: 1038 [2022-11-20 19:49:43,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 198 SyntacticMatches, 11 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1910 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=736, Invalid=4094, Unknown=0, NotChecked=0, Total=4830 [2022-11-20 19:49:43,858 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 206 mSDsluCounter, 449 mSDsCounter, 0 mSdLazyCounter, 843 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 542 SdHoareTripleChecker+Invalid, 1147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-20 19:49:43,858 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 542 Invalid, 1147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [304 Valid, 843 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-20 19:49:43,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1038 states. [2022-11-20 19:49:45,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1038 to 852. [2022-11-20 19:49:45,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 852 states, 426 states have (on average 1.3051643192488263) internal successors, (556), 427 states have internal predecessors, (556), 401 states have call successors, (401), 24 states have call predecessors, (401), 24 states have return successors, (400), 400 states have call predecessors, (400), 400 states have call successors, (400) [2022-11-20 19:49:45,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 852 states to 852 states and 1357 transitions. [2022-11-20 19:49:45,098 INFO L78 Accepts]: Start accepts. Automaton has 852 states and 1357 transitions. Word has length 81 [2022-11-20 19:49:45,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:49:45,099 INFO L495 AbstractCegarLoop]: Abstraction has 852 states and 1357 transitions. [2022-11-20 19:49:45,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-20 19:49:45,100 INFO L276 IsEmpty]: Start isEmpty. Operand 852 states and 1357 transitions. [2022-11-20 19:49:45,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-20 19:49:45,101 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:49:45,102 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 3, 3, 3, 3, 3, 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] [2022-11-20 19:49:45,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-20 19:49:45,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-20 19:49:45,309 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:49:45,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:49:45,309 INFO L85 PathProgramCache]: Analyzing trace with hash 144664241, now seen corresponding path program 1 times [2022-11-20 19:49:45,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:49:45,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160218193] [2022-11-20 19:49:45,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:49:45,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:49:45,335 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:49:45,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [97345228] [2022-11-20 19:49:45,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:49:45,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:49:45,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:49:45,349 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:49:45,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-20 19:49:45,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:49:45,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-20 19:49:45,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:49:46,393 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-20 19:49:46,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:49:47,714 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-11-20 19:49:47,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:49:47,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160218193] [2022-11-20 19:49:47,714 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:49:47,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97345228] [2022-11-20 19:49:47,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97345228] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:49:47,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [88842516] [2022-11-20 19:49:47,717 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-20 19:49:47,717 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:49:47,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:49:47,718 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:49:47,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:49:54,067 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-20 19:49:54,112 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:49:54,126 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:50:05,395 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16502#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:50:05,395 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:50:05,395 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:50:05,395 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2022-11-20 19:50:05,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62004464] [2022-11-20 19:50:05,396 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:50:05,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-20 19:50:05,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:50:05,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-20 19:50:05,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2022-11-20 19:50:05,398 INFO L87 Difference]: Start difference. First operand 852 states and 1357 transitions. Second operand has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 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) [2022-11-20 19:50:26,966 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:50:29,322 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.70s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:51:06,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:51:06,127 INFO L93 Difference]: Finished difference Result 1152 states and 1820 transitions. [2022-11-20 19:51:06,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-20 19:51:06,128 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 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 81 [2022-11-20 19:51:06,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:51:06,134 INFO L225 Difference]: With dead ends: 1152 [2022-11-20 19:51:06,135 INFO L226 Difference]: Without dead ends: 1150 [2022-11-20 19:51:06,137 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 187 SyntacticMatches, 18 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2361 ImplicationChecksByTransitivity, 43.6s TimeCoverageRelationStatistics Valid=887, Invalid=5118, Unknown=1, NotChecked=0, Total=6006 [2022-11-20 19:51:06,139 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 194 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 1615 mSolverCounterSat, 353 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 1969 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 353 IncrementalHoareTripleChecker+Valid, 1615 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.5s IncrementalHoareTripleChecker+Time [2022-11-20 19:51:06,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [194 Valid, 498 Invalid, 1969 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [353 Valid, 1615 Invalid, 1 Unknown, 0 Unchecked, 27.5s Time] [2022-11-20 19:51:06,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1150 states. [2022-11-20 19:51:07,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1150 to 1056. [2022-11-20 19:51:07,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1056 states, 533 states have (on average 1.3076923076923077) internal successors, (697), 534 states have internal predecessors, (697), 493 states have call successors, (493), 29 states have call predecessors, (493), 29 states have return successors, (492), 492 states have call predecessors, (492), 492 states have call successors, (492) [2022-11-20 19:51:07,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1056 states to 1056 states and 1682 transitions. [2022-11-20 19:51:07,737 INFO L78 Accepts]: Start accepts. Automaton has 1056 states and 1682 transitions. Word has length 81 [2022-11-20 19:51:07,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:51:07,737 INFO L495 AbstractCegarLoop]: Abstraction has 1056 states and 1682 transitions. [2022-11-20 19:51:07,737 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 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) [2022-11-20 19:51:07,738 INFO L276 IsEmpty]: Start isEmpty. Operand 1056 states and 1682 transitions. [2022-11-20 19:51:07,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-20 19:51:07,739 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:51:07,740 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:51:07,746 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-20 19:51:07,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:51:07,946 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:51:07,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:51:07,946 INFO L85 PathProgramCache]: Analyzing trace with hash 646028470, now seen corresponding path program 6 times [2022-11-20 19:51:07,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:51:07,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470865318] [2022-11-20 19:51:07,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:51:07,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:51:07,967 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:51:07,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [431913993] [2022-11-20 19:51:07,967 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:51:07,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:51:07,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:51:07,969 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:51:07,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-20 19:51:08,043 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:51:08,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:51:08,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-20 19:51:08,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:51:10,219 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 34 proven. 44 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-20 19:51:10,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:51:11,066 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-20 19:51:11,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:51:11,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470865318] [2022-11-20 19:51:11,067 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:51:11,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431913993] [2022-11-20 19:51:11,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431913993] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:51:11,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253722873] [2022-11-20 19:51:11,068 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-20 19:51:11,069 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:51:11,069 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:51:11,069 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:51:11,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:51:17,118 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-20 19:51:17,181 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:51:17,194 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:51:21,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20807#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:51:21,941 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:51:21,941 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:51:21,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 8] total 24 [2022-11-20 19:51:21,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99541906] [2022-11-20 19:51:21,941 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:51:21,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 19:51:21,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:51:21,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 19:51:21,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1624, Unknown=0, NotChecked=0, Total=1806 [2022-11-20 19:51:21,944 INFO L87 Difference]: Start difference. First operand 1056 states and 1682 transitions. Second operand has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-20 19:51:46,753 WARN L233 SmtUtils]: Spent 5.05s on a formula simplification. DAG size of input: 28 DAG size of output: 27 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 19:52:00,624 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.34s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:52:05,034 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:52:06,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:52:06,673 INFO L93 Difference]: Finished difference Result 1176 states and 1848 transitions. [2022-11-20 19:52:06,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-20 19:52:06,673 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) Word has length 84 [2022-11-20 19:52:06,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:52:06,680 INFO L225 Difference]: With dead ends: 1176 [2022-11-20 19:52:06,681 INFO L226 Difference]: Without dead ends: 1174 [2022-11-20 19:52:06,683 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 31.8s TimeCoverageRelationStatistics Valid=378, Invalid=3282, Unknown=0, NotChecked=0, Total=3660 [2022-11-20 19:52:06,684 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 127 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 1036 mSolverCounterSat, 155 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 1192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 1036 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.5s IncrementalHoareTripleChecker+Time [2022-11-20 19:52:06,684 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 279 Invalid, 1192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 1036 Invalid, 1 Unknown, 0 Unchecked, 17.5s Time] [2022-11-20 19:52:06,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1174 states. [2022-11-20 19:52:08,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1174 to 1080. [2022-11-20 19:52:08,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1080 states, 551 states have (on average 1.2976406533575318) internal successors, (715), 552 states have internal predecessors, (715), 493 states have call successors, (493), 35 states have call predecessors, (493), 35 states have return successors, (492), 492 states have call predecessors, (492), 492 states have call successors, (492) [2022-11-20 19:52:08,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1080 states to 1080 states and 1700 transitions. [2022-11-20 19:52:08,804 INFO L78 Accepts]: Start accepts. Automaton has 1080 states and 1700 transitions. Word has length 84 [2022-11-20 19:52:08,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:52:08,805 INFO L495 AbstractCegarLoop]: Abstraction has 1080 states and 1700 transitions. [2022-11-20 19:52:08,805 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-20 19:52:08,805 INFO L276 IsEmpty]: Start isEmpty. Operand 1080 states and 1700 transitions. [2022-11-20 19:52:08,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-20 19:52:08,808 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:52:08,808 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 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, 1, 1, 1, 1] [2022-11-20 19:52:08,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-20 19:52:09,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-20 19:52:09,016 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:52:09,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:52:09,016 INFO L85 PathProgramCache]: Analyzing trace with hash 355863159, now seen corresponding path program 2 times [2022-11-20 19:52:09,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:52:09,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588467077] [2022-11-20 19:52:09,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:52:09,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:52:09,027 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:52:09,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [938313447] [2022-11-20 19:52:09,027 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:52:09,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:52:09,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:52:09,029 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:52:09,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-20 19:52:09,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-20 19:52:09,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:52:09,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-20 19:52:09,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:52:10,487 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 27 proven. 27 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-20 19:52:10,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:52:12,398 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 24 proven. 27 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-20 19:52:12,398 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:52:12,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588467077] [2022-11-20 19:52:12,399 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:52:12,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938313447] [2022-11-20 19:52:12,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938313447] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:52:12,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1161329921] [2022-11-20 19:52:12,402 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-20 19:52:12,402 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:52:12,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:52:12,403 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:52:12,403 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:52:19,004 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 19:52:19,007 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:52:19,020 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:52:25,339 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25237#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:52:25,339 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:52:25,339 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:52:25,340 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 29 [2022-11-20 19:52:25,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663906908] [2022-11-20 19:52:25,340 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:52:25,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-20 19:52:25,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:52:25,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-20 19:52:25,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=1842, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 19:52:25,342 INFO L87 Difference]: Start difference. First operand 1080 states and 1700 transitions. Second operand has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2022-11-20 19:52:44,280 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:53:08,268 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:53:27,105 WARN L233 SmtUtils]: Spent 6.70s on a formula simplification. DAG size of input: 86 DAG size of output: 83 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 19:53:47,944 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:54:01,266 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:54:08,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:54:08,331 INFO L93 Difference]: Finished difference Result 1729 states and 2718 transitions. [2022-11-20 19:54:08,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-20 19:54:08,331 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) Word has length 98 [2022-11-20 19:54:08,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:54:08,340 INFO L225 Difference]: With dead ends: 1729 [2022-11-20 19:54:08,340 INFO L226 Difference]: Without dead ends: 1317 [2022-11-20 19:54:08,345 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 239 SyntacticMatches, 9 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5654 ImplicationChecksByTransitivity, 75.0s TimeCoverageRelationStatistics Valid=2339, Invalid=13161, Unknown=0, NotChecked=0, Total=15500 [2022-11-20 19:54:08,346 INFO L413 NwaCegarLoop]: 99 mSDtfsCounter, 354 mSDsluCounter, 504 mSDsCounter, 0 mSdLazyCounter, 1892 mSolverCounterSat, 711 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 603 SdHoareTripleChecker+Invalid, 2605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 711 IncrementalHoareTripleChecker+Valid, 1892 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.6s IncrementalHoareTripleChecker+Time [2022-11-20 19:54:08,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [354 Valid, 603 Invalid, 2605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [711 Valid, 1892 Invalid, 2 Unknown, 0 Unchecked, 32.6s Time] [2022-11-20 19:54:08,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1317 states. [2022-11-20 19:54:10,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1317 to 1164. [2022-11-20 19:54:10,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1164 states, 591 states have (on average 1.2944162436548223) internal successors, (765), 592 states have internal predecessors, (765), 533 states have call successors, (533), 39 states have call predecessors, (533), 39 states have return successors, (532), 532 states have call predecessors, (532), 532 states have call successors, (532) [2022-11-20 19:54:10,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1164 states to 1164 states and 1830 transitions. [2022-11-20 19:54:10,738 INFO L78 Accepts]: Start accepts. Automaton has 1164 states and 1830 transitions. Word has length 98 [2022-11-20 19:54:10,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:54:10,739 INFO L495 AbstractCegarLoop]: Abstraction has 1164 states and 1830 transitions. [2022-11-20 19:54:10,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2022-11-20 19:54:10,740 INFO L276 IsEmpty]: Start isEmpty. Operand 1164 states and 1830 transitions. [2022-11-20 19:54:10,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-20 19:54:10,742 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:54:10,742 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:54:10,749 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-20 19:54:10,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-20 19:54:10,948 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:54:10,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:54:10,949 INFO L85 PathProgramCache]: Analyzing trace with hash -1281823225, now seen corresponding path program 3 times [2022-11-20 19:54:10,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:54:10,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630708316] [2022-11-20 19:54:10,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:54:10,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:54:10,971 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:54:10,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [190393079] [2022-11-20 19:54:10,971 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:54:10,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:54:10,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:54:10,973 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:54:10,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-20 19:54:11,083 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:54:11,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:54:11,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-20 19:54:11,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:54:12,682 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 52 proven. 46 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2022-11-20 19:54:12,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:54:20,700 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 50 proven. 45 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2022-11-20 19:54:20,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:54:20,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630708316] [2022-11-20 19:54:20,700 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:54:20,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190393079] [2022-11-20 19:54:20,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190393079] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:54:20,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1763730810] [2022-11-20 19:54:20,702 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-20 19:54:20,702 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:54:20,703 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:54:20,703 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:54:20,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:54:26,893 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-20 19:54:26,897 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:54:26,909 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:54:41,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30876#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:54:41,166 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:54:41,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:54:41,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2022-11-20 19:54:41,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084442174] [2022-11-20 19:54:41,167 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:54:41,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-20 19:54:41,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:54:41,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-20 19:54:41,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=2539, Unknown=0, NotChecked=0, Total=2862 [2022-11-20 19:54:41,169 INFO L87 Difference]: Start difference. First operand 1164 states and 1830 transitions. Second operand has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) [2022-11-20 19:54:50,592 WARN L233 SmtUtils]: Spent 5.76s on a formula simplification that was a NOOP. DAG size: 105 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 19:55:02,083 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:55:04,629 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:55:10,672 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:55:20,758 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:55:43,854 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:55:45,650 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.78s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:55:48,271 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:56:02,112 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:56:12,362 WARN L233 SmtUtils]: Spent 5.24s on a formula simplification that was a NOOP. DAG size: 108 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 19:56:19,401 WARN L233 SmtUtils]: Spent 5.87s on a formula simplification that was a NOOP. DAG size: 107 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 19:56:44,491 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:56:52,172 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:56:59,496 WARN L233 SmtUtils]: Spent 7.11s on a formula simplification that was a NOOP. DAG size: 115 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 19:57:17,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:57:17,840 INFO L93 Difference]: Finished difference Result 1454 states and 2238 transitions. [2022-11-20 19:57:17,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-11-20 19:57:17,841 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) Word has length 103 [2022-11-20 19:57:17,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:57:17,848 INFO L225 Difference]: With dead ends: 1454 [2022-11-20 19:57:17,848 INFO L226 Difference]: Without dead ends: 1446 [2022-11-20 19:57:17,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 243 SyntacticMatches, 12 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5126 ImplicationChecksByTransitivity, 125.3s TimeCoverageRelationStatistics Valid=2192, Invalid=12086, Unknown=2, NotChecked=0, Total=14280 [2022-11-20 19:57:17,852 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 435 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 2447 mSolverCounterSat, 888 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 44.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 435 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 3343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 888 IncrementalHoareTripleChecker+Valid, 2447 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 45.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:57:17,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [435 Valid, 368 Invalid, 3343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [888 Valid, 2447 Invalid, 8 Unknown, 0 Unchecked, 45.2s Time] [2022-11-20 19:57:17,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1446 states. [2022-11-20 19:57:21,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1446 to 1342. [2022-11-20 19:57:21,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1342 states, 681 states have (on average 1.2936857562408224) internal successors, (881), 682 states have internal predecessors, (881), 613 states have call successors, (613), 47 states have call predecessors, (613), 47 states have return successors, (612), 612 states have call predecessors, (612), 612 states have call successors, (612) [2022-11-20 19:57:21,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1342 states to 1342 states and 2106 transitions. [2022-11-20 19:57:21,231 INFO L78 Accepts]: Start accepts. Automaton has 1342 states and 2106 transitions. Word has length 103 [2022-11-20 19:57:21,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:57:21,232 INFO L495 AbstractCegarLoop]: Abstraction has 1342 states and 2106 transitions. [2022-11-20 19:57:21,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) [2022-11-20 19:57:21,232 INFO L276 IsEmpty]: Start isEmpty. Operand 1342 states and 2106 transitions. [2022-11-20 19:57:21,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-20 19:57:21,235 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:57:21,235 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 4, 4, 4, 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] [2022-11-20 19:57:21,242 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-20 19:57:21,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:57:21,442 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:57:21,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:57:21,442 INFO L85 PathProgramCache]: Analyzing trace with hash 1547138168, now seen corresponding path program 2 times [2022-11-20 19:57:21,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:57:21,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366677003] [2022-11-20 19:57:21,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:57:21,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:57:21,452 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:57:21,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2052903199] [2022-11-20 19:57:21,452 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 19:57:21,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:57:21,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:57:21,454 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:57:21,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-20 19:57:21,569 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 19:57:21,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:57:21,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 71 conjunts are in the unsatisfiable core [2022-11-20 19:57:21,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:57:23,783 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 70 proven. 35 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2022-11-20 19:57:23,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:57:25,628 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:57:25,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366677003] [2022-11-20 19:57:25,628 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:57:25,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052903199] [2022-11-20 19:57:25,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052903199] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 19:57:25,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1071797718] [2022-11-20 19:57:25,630 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-20 19:57:25,630 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:57:25,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:57:25,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:57:25,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:57:32,181 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-20 19:57:32,227 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:57:32,241 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:57:48,331 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36062#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:57:48,331 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:57:48,331 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 19:57:48,332 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-20 19:57:48,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151537702] [2022-11-20 19:57:48,332 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 19:57:48,332 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-20 19:57:48,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:57:48,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-20 19:57:48,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1609, Unknown=0, NotChecked=0, Total=1806 [2022-11-20 19:57:48,333 INFO L87 Difference]: Start difference. First operand 1342 states and 2106 transitions. Second operand has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-20 19:57:54,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:57:54,210 INFO L93 Difference]: Finished difference Result 1512 states and 2356 transitions. [2022-11-20 19:57:54,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 19:57:54,211 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 108 [2022-11-20 19:57:54,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:57:54,220 INFO L225 Difference]: With dead ends: 1512 [2022-11-20 19:57:54,220 INFO L226 Difference]: Without dead ends: 1510 [2022-11-20 19:57:54,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 169 SyntacticMatches, 25 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1768 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=290, Invalid=2362, Unknown=0, NotChecked=0, Total=2652 [2022-11-20 19:57:54,223 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 92 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 955 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 1016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 955 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-20 19:57:54,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 209 Invalid, 1016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 955 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-20 19:57:54,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1510 states. [2022-11-20 19:57:57,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1510 to 1418. [2022-11-20 19:57:57,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1418 states, 724 states have (on average 1.2900552486187846) internal successors, (934), 725 states have internal predecessors, (934), 641 states have call successors, (641), 52 states have call predecessors, (641), 52 states have return successors, (640), 640 states have call predecessors, (640), 640 states have call successors, (640) [2022-11-20 19:57:57,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1418 states to 1418 states and 2215 transitions. [2022-11-20 19:57:57,507 INFO L78 Accepts]: Start accepts. Automaton has 1418 states and 2215 transitions. Word has length 108 [2022-11-20 19:57:57,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:57:57,507 INFO L495 AbstractCegarLoop]: Abstraction has 1418 states and 2215 transitions. [2022-11-20 19:57:57,508 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-20 19:57:57,508 INFO L276 IsEmpty]: Start isEmpty. Operand 1418 states and 2215 transitions. [2022-11-20 19:57:57,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-20 19:57:57,511 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:57:57,512 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 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] [2022-11-20 19:57:57,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-20 19:57:57,724 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2022-11-20 19:57:57,724 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 19:57:57,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:57:57,725 INFO L85 PathProgramCache]: Analyzing trace with hash -1168736987, now seen corresponding path program 3 times [2022-11-20 19:57:57,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 19:57:57,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861005130] [2022-11-20 19:57:57,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:57:57,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 19:57:57,734 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 19:57:57,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2006899648] [2022-11-20 19:57:57,734 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 19:57:57,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:57:57,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:57:57,736 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:57:57,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_82af046d-5fb4-43d6-98d9-ef629f536f38/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-20 19:57:57,959 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 19:57:57,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:57:57,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 78 conjunts are in the unsatisfiable core [2022-11-20 19:57:57,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:57:59,334 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 28 proven. 56 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2022-11-20 19:57:59,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:58:02,915 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 26 proven. 55 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2022-11-20 19:58:02,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 19:58:02,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861005130] [2022-11-20 19:58:02,915 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 19:58:02,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006899648] [2022-11-20 19:58:02,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2006899648] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:58:02,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1290075488] [2022-11-20 19:58:02,917 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-20 19:58:02,917 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 19:58:02,917 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 19:58:02,918 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 19:58:02,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 19:58:08,773 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-20 19:58:08,821 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-20 19:58:08,835 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 19:58:35,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41653#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 19:58:35,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 19:58:35,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:58:35,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16] total 32 [2022-11-20 19:58:35,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134514965] [2022-11-20 19:58:35,627 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 19:58:35,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-20 19:58:35,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 19:58:35,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-20 19:58:35,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=2029, Unknown=0, NotChecked=0, Total=2256 [2022-11-20 19:58:35,629 INFO L87 Difference]: Start difference. First operand 1418 states and 2215 transitions. Second operand has 32 states, 31 states have (on average 2.193548387096774) internal successors, (68), 29 states have internal predecessors, (68), 10 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 10 states have call successors, (32) [2022-11-20 19:58:57,387 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 [] [2022-11-20 19:58:59,439 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-20 19:59:24,591 WARN L233 SmtUtils]: Spent 14.86s on a formula simplification. DAG size of input: 107 DAG size of output: 100 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)