./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW --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 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b --- 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-4e7fbc6 [2022-11-23 14:47:38,605 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:47:38,607 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:47:38,627 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:47:38,628 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:47:38,629 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:47:38,630 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:47:38,632 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:47:38,634 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:47:38,635 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:47:38,636 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:47:38,637 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:47:38,638 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:47:38,639 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:47:38,640 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:47:38,641 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:47:38,642 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:47:38,643 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:47:38,645 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:47:38,647 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:47:38,648 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:47:38,652 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:47:38,653 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:47:38,654 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:47:38,658 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:47:38,658 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:47:38,659 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:47:38,660 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:47:38,660 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:47:38,661 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:47:38,661 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:47:38,662 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:47:38,663 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:47:38,664 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:47:38,665 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:47:38,666 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:47:38,666 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:47:38,675 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:47:38,675 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:47:38,679 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:47:38,680 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:47:38,681 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:47:38,729 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:47:38,730 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:47:38,730 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:47:38,730 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:47:38,735 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:47:38,736 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:47:38,736 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:47:38,736 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:47:38,736 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:47:38,736 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:47:38,738 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:47:38,738 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:47:38,738 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:47:38,738 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:47:38,739 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:47:38,739 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:47:38,739 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:47:38,739 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:47:38,741 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:47:38,741 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:47:38,741 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:47:38,741 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:47:38,741 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:47:38,742 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:47:38,742 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:47:38,742 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:47:38,743 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:47:38,744 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:47:38,744 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:47:38,744 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:47:38,745 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:47:38,745 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:47:38,746 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:47:38,746 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:47:38,746 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:47:38,746 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:47:38,747 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:47:38,747 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:47:38,747 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:47:38,747 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:47:38,747 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:47:38,748 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_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b [2022-11-23 14:47:39,075 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:47:39,113 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:47:39,116 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:47:39,117 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:47:39,118 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:47:39,119 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2022-11-23 14:47:42,251 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:47:42,573 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:47:42,573 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2022-11-23 14:47:42,581 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/data/118e76675/823097a423774b9a93f9829c1df08a99/FLAG42bf4900d [2022-11-23 14:47:42,597 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/data/118e76675/823097a423774b9a93f9829c1df08a99 [2022-11-23 14:47:42,600 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:47:42,602 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:47:42,604 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:47:42,604 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:47:42,609 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:47:42,610 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,612 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b4598e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42, skipping insertion in model container [2022-11-23 14:47:42,612 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,621 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:47:42,639 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:47:42,790 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_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2022-11-23 14:47:42,813 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:47:42,824 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:47:42,837 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_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2022-11-23 14:47:42,847 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:47:42,862 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:47:42,863 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42 WrapperNode [2022-11-23 14:47:42,863 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:47:42,864 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:47:42,865 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:47:42,865 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:47:42,873 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,883 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,919 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 91 [2022-11-23 14:47:42,919 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:47:42,920 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:47:42,920 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:47:42,920 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:47:42,935 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,936 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,954 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,954 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,957 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,969 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,970 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,972 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,977 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:47:42,978 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:47:42,989 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:47:42,989 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:47:42,990 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (1/1) ... [2022-11-23 14:47:42,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:47:43,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:43,029 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:47:43,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:47:43,079 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:47:43,079 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-23 14:47:43,079 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-23 14:47:43,080 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:47:43,080 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:47:43,080 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:47:43,080 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 14:47:43,080 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 14:47:43,169 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:47:43,172 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:47:43,477 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:47:43,504 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:47:43,504 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-23 14:47:43,507 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:47:43 BoogieIcfgContainer [2022-11-23 14:47:43,508 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:47:43,510 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:47:43,510 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:47:43,514 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:47:43,514 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:47:42" (1/3) ... [2022-11-23 14:47:43,515 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62da7b7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:47:43, skipping insertion in model container [2022-11-23 14:47:43,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:42" (2/3) ... [2022-11-23 14:47:43,516 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62da7b7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:47:43, skipping insertion in model container [2022-11-23 14:47:43,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:47:43" (3/3) ... [2022-11-23 14:47:43,518 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound50.c [2022-11-23 14:47:43,541 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:47:43,541 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:47:43,599 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:47:43,607 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;@2a34ce48, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:47:43,607 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:47:43,612 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-23 14:47:43,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-23 14:47:43,621 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:43,622 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:43,623 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:47:43,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:43,629 INFO L85 PathProgramCache]: Analyzing trace with hash 1826888722, now seen corresponding path program 1 times [2022-11-23 14:47:43,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:43,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508333378] [2022-11-23 14:47:43,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:43,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:43,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:43,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:43,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508333378] [2022-11-23 14:47:43,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:47:43,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688647229] [2022-11-23 14:47:43,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:43,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:43,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:43,789 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:43,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:47:43,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:43,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-23 14:47:43,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:43,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:47:43,897 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:47:43,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [688647229] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:43,898 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:43,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:47:43,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053784789] [2022-11-23 14:47:43,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:43,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-23 14:47:43,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:43,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-23 14:47:43,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:47:43,941 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:43,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:43,974 INFO L93 Difference]: Finished difference Result 54 states and 86 transitions. [2022-11-23 14:47:43,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-23 14:47:43,977 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-11-23 14:47:43,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:43,986 INFO L225 Difference]: With dead ends: 54 [2022-11-23 14:47:43,987 INFO L226 Difference]: Without dead ends: 28 [2022-11-23 14:47:43,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:47:43,994 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:43,996 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:47:44,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-23 14:47:44,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-23 14:47:44,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:47:44,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-11-23 14:47:44,039 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 13 [2022-11-23 14:47:44,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:44,040 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-11-23 14:47:44,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:44,041 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-11-23 14:47:44,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-23 14:47:44,043 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:44,043 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:44,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:44,272 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-23 14:47:44,272 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:47:44,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:44,273 INFO L85 PathProgramCache]: Analyzing trace with hash -828509657, now seen corresponding path program 1 times [2022-11-23 14:47:44,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:44,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924763355] [2022-11-23 14:47:44,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:44,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:44,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:44,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:44,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924763355] [2022-11-23 14:47:44,346 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:47:44,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598306809] [2022-11-23 14:47:44,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:44,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:44,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:44,354 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:44,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:47:44,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:44,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-23 14:47:44,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:44,494 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:47:44,494 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:47:44,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598306809] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:44,495 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:44,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:47:44,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467345955] [2022-11-23 14:47:44,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:44,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:47:44,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:44,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:47:44,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:47:44,499 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:44,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:44,569 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2022-11-23 14:47:44,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:47:44,571 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-23 14:47:44,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:44,572 INFO L225 Difference]: With dead ends: 37 [2022-11-23 14:47:44,572 INFO L226 Difference]: Without dead ends: 30 [2022-11-23 14:47:44,574 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:47:44,575 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:44,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 94 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:47:44,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-23 14:47:44,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-23 14:47:44,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:47:44,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2022-11-23 14:47:44,597 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2022-11-23 14:47:44,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:44,598 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2022-11-23 14:47:44,599 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:44,599 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2022-11-23 14:47:44,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 14:47:44,600 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:44,615 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:44,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:44,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:44,821 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:47:44,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:44,822 INFO L85 PathProgramCache]: Analyzing trace with hash 66369279, now seen corresponding path program 1 times [2022-11-23 14:47:44,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:44,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114383112] [2022-11-23 14:47:44,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:44,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:44,845 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:47:44,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1590416811] [2022-11-23 14:47:44,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:44,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:44,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:44,851 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:44,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:47:44,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:44,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-23 14:47:44,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:45,037 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:47:45,040 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:47:45,040 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:45,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114383112] [2022-11-23 14:47:45,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:47:45,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590416811] [2022-11-23 14:47:45,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590416811] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:45,041 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:45,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:47:45,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368296200] [2022-11-23 14:47:45,042 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:45,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:47:45,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:45,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:47:45,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:47:45,045 INFO L87 Difference]: Start difference. First operand 30 states and 40 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:45,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:45,190 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2022-11-23 14:47:45,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:47:45,191 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2022-11-23 14:47:45,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:45,192 INFO L225 Difference]: With dead ends: 50 [2022-11-23 14:47:45,192 INFO L226 Difference]: Without dead ends: 43 [2022-11-23 14:47:45,193 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:47:45,194 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 45 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:45,195 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 88 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:47:45,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-23 14:47:45,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2022-11-23 14:47:45,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:47:45,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-11-23 14:47:45,204 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 15 [2022-11-23 14:47:45,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:45,205 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-11-23 14:47:45,205 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:45,205 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-11-23 14:47:45,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:47:45,206 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:45,206 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:45,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:45,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:45,413 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:47:45,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:45,413 INFO L85 PathProgramCache]: Analyzing trace with hash -1737104877, now seen corresponding path program 1 times [2022-11-23 14:47:45,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:45,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2127522163] [2022-11-23 14:47:45,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:45,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:45,434 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:47:45,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [491668895] [2022-11-23 14:47:45,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:45,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:45,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:45,439 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:45,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:47:45,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:45,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 14:47:45,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:45,586 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:47:45,586 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:47:45,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:45,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2127522163] [2022-11-23 14:47:45,587 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:47:45,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491668895] [2022-11-23 14:47:45,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491668895] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:45,587 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:45,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 14:47:45,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548863434] [2022-11-23 14:47:45,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:45,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:47:45,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:45,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:47:45,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:47:45,593 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:45,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:45,649 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2022-11-23 14:47:45,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:47:45,649 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2022-11-23 14:47:45,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:45,651 INFO L225 Difference]: With dead ends: 55 [2022-11-23 14:47:45,651 INFO L226 Difference]: Without dead ends: 33 [2022-11-23 14:47:45,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:47:45,652 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:45,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 119 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:47:45,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-23 14:47:45,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-23 14:47:45,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:47:45,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-11-23 14:47:45,661 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 20 [2022-11-23 14:47:45,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:45,662 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-11-23 14:47:45,662 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:45,663 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-11-23 14:47:45,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:47:45,663 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:45,664 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:45,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:45,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:45,871 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:47:45,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:45,872 INFO L85 PathProgramCache]: Analyzing trace with hash 148941760, now seen corresponding path program 1 times [2022-11-23 14:47:45,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:45,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067470083] [2022-11-23 14:47:45,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:45,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:45,887 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:47:45,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1224061112] [2022-11-23 14:47:45,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:45,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:45,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:45,889 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:45,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:47:45,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:45,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 14:47:45,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:46,221 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:47:46,221 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:47:46,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:46,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067470083] [2022-11-23 14:47:46,222 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:47:46,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224061112] [2022-11-23 14:47:46,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224061112] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:46,222 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:46,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-23 14:47:46,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685928427] [2022-11-23 14:47:46,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:46,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 14:47:46,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:46,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 14:47:46,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:47:46,225 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:46,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:46,351 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2022-11-23 14:47:46,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 14:47:46,352 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2022-11-23 14:47:46,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:46,353 INFO L225 Difference]: With dead ends: 51 [2022-11-23 14:47:46,353 INFO L226 Difference]: Without dead ends: 49 [2022-11-23 14:47:46,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-11-23 14:47:46,354 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 71 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:46,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 131 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:47:46,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-23 14:47:46,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2022-11-23 14:47:46,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 34 states have internal predecessors, (44), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:47:46,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2022-11-23 14:47:46,367 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 20 [2022-11-23 14:47:46,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:46,368 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2022-11-23 14:47:46,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:47:46,368 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2022-11-23 14:47:46,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-23 14:47:46,369 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:46,369 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:46,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:46,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:46,576 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:47:46,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:46,576 INFO L85 PathProgramCache]: Analyzing trace with hash -1894324762, now seen corresponding path program 1 times [2022-11-23 14:47:46,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:46,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392952864] [2022-11-23 14:47:46,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:46,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:46,594 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:47:46,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1956203804] [2022-11-23 14:47:46,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:46,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:46,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:46,599 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:46,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:47:46,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:46,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-23 14:47:46,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:46,745 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:47:46,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:47:46,875 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:47:46,876 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:46,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392952864] [2022-11-23 14:47:46,877 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:47:46,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956203804] [2022-11-23 14:47:46,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956203804] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:47:46,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2040532385] [2022-11-23 14:47:46,904 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 14:47:46,904 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:47:46,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:47:46,932 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:47:46,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:47:48,033 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:47:48,078 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:47:51,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [2040532385] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:51,208 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:47:51,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 6] total 22 [2022-11-23 14:47:51,209 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111136596] [2022-11-23 14:47:51,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:51,210 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 14:47:51,210 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:51,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 14:47:51,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:47:51,211 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:47:53,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:53,296 INFO L93 Difference]: Finished difference Result 88 states and 125 transitions. [2022-11-23 14:47:53,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-23 14:47:53,298 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-11-23 14:47:53,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:53,299 INFO L225 Difference]: With dead ends: 88 [2022-11-23 14:47:53,300 INFO L226 Difference]: Without dead ends: 66 [2022-11-23 14:47:53,300 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=176, Invalid=580, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:47:53,301 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 18 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:53,307 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 145 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:47:53,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-23 14:47:53,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2022-11-23 14:47:53,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 42 states have internal predecessors, (54), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:47:53,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 75 transitions. [2022-11-23 14:47:53,333 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 75 transitions. Word has length 21 [2022-11-23 14:47:53,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:53,333 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 75 transitions. [2022-11-23 14:47:53,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:47:53,334 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 75 transitions. [2022-11-23 14:47:53,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 14:47:53,334 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:53,335 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:53,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:53,541 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:53,541 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:47:53,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:53,542 INFO L85 PathProgramCache]: Analyzing trace with hash -1377591568, now seen corresponding path program 1 times [2022-11-23 14:47:53,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:53,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173802228] [2022-11-23 14:47:53,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:53,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:53,556 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:47:53,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1112907776] [2022-11-23 14:47:53,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:53,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:53,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:53,558 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:53,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:47:53,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:53,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-23 14:47:53,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:54,022 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:47:54,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:47:54,151 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:54,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173802228] [2022-11-23 14:47:54,152 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:47:54,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112907776] [2022-11-23 14:47:54,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112907776] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:47:54,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [952551360] [2022-11-23 14:47:54,157 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-23 14:47:54,158 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:47:54,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:47:54,158 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:47:54,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:47:54,547 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-23 14:47:54,559 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:47:54,597 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:47:57,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [952551360] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:57,183 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:47:57,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [13] total 29 [2022-11-23 14:47:57,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809148319] [2022-11-23 14:47:57,183 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:57,183 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 14:47:57,183 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:57,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 14:47:57,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:47:57,185 INFO L87 Difference]: Start difference. First operand 56 states and 75 transitions. Second operand has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 14:47:57,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:57,659 INFO L93 Difference]: Finished difference Result 110 states and 150 transitions. [2022-11-23 14:47:57,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 14:47:57,659 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 25 [2022-11-23 14:47:57,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:57,661 INFO L225 Difference]: With dead ends: 110 [2022-11-23 14:47:57,661 INFO L226 Difference]: Without dead ends: 73 [2022-11-23 14:47:57,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:47:57,663 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 9 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:57,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 123 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:47:57,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-23 14:47:57,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2022-11-23 14:47:57,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.2653061224489797) internal successors, (62), 51 states have internal predecessors, (62), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-23 14:47:57,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2022-11-23 14:47:57,708 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 25 [2022-11-23 14:47:57,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:57,709 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2022-11-23 14:47:57,709 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 14:47:57,709 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2022-11-23 14:47:57,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-23 14:47:57,710 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:57,710 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:57,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:57,918 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:57,918 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:47:57,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:57,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1856138177, now seen corresponding path program 1 times [2022-11-23 14:47:57,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:57,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727463973] [2022-11-23 14:47:57,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:57,919 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:57,937 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:47:57,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1145895512] [2022-11-23 14:47:57,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:57,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:57,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:57,942 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:57,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:47:57,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:57,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-23 14:47:58,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:58,248 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:47:58,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:47:58,370 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:47:58,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:58,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727463973] [2022-11-23 14:47:58,371 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:47:58,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145895512] [2022-11-23 14:47:58,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145895512] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:47:58,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1096992176] [2022-11-23 14:47:58,376 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-23 14:47:58,376 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:47:58,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:47:58,377 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:47:58,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:47:59,234 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2022-11-23 14:47:59,251 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:47:59,279 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:04,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1096992176] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:04,078 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:48:04,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [9, 6] total 30 [2022-11-23 14:48:04,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260497992] [2022-11-23 14:48:04,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:04,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-23 14:48:04,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:04,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-23 14:48:04,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:48:04,080 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:48:07,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:07,093 INFO L93 Difference]: Finished difference Result 108 states and 145 transitions. [2022-11-23 14:48:07,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-23 14:48:07,094 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2022-11-23 14:48:07,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:07,095 INFO L225 Difference]: With dead ends: 108 [2022-11-23 14:48:07,095 INFO L226 Difference]: Without dead ends: 86 [2022-11-23 14:48:07,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=192, Invalid=1290, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 14:48:07,097 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 22 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:07,097 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 154 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-23 14:48:07,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-23 14:48:07,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2022-11-23 14:48:07,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.2407407407407407) internal successors, (67), 57 states have internal predecessors, (67), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-23 14:48:07,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 104 transitions. [2022-11-23 14:48:07,123 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 104 transitions. Word has length 27 [2022-11-23 14:48:07,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:07,124 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 104 transitions. [2022-11-23 14:48:07,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:48:07,124 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 104 transitions. [2022-11-23 14:48:07,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-23 14:48:07,126 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:07,126 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1] [2022-11-23 14:48:07,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:07,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:07,333 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:07,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:07,333 INFO L85 PathProgramCache]: Analyzing trace with hash -301475410, now seen corresponding path program 1 times [2022-11-23 14:48:07,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:07,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386677491] [2022-11-23 14:48:07,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:07,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:07,346 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:07,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [443839340] [2022-11-23 14:48:07,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:07,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:07,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:07,358 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:07,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:48:07,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:07,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-23 14:48:07,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:07,533 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:48:07,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:07,635 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:48:07,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:07,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386677491] [2022-11-23 14:48:07,636 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:07,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443839340] [2022-11-23 14:48:07,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443839340] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:07,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2117097963] [2022-11-23 14:48:07,642 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:48:07,642 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:07,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:07,643 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:07,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:15,666 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-23 14:48:15,674 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:48:15,701 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:20,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [2117097963] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:20,468 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:48:20,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [6, 7] total 29 [2022-11-23 14:48:20,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002945361] [2022-11-23 14:48:20,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:20,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-23 14:48:20,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:20,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-23 14:48:20,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=607, Unknown=0, NotChecked=0, Total=812 [2022-11-23 14:48:20,470 INFO L87 Difference]: Start difference. First operand 80 states and 104 transitions. Second operand has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-23 14:48:21,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:21,212 INFO L93 Difference]: Finished difference Result 138 states and 185 transitions. [2022-11-23 14:48:21,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-23 14:48:21,213 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2022-11-23 14:48:21,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:21,215 INFO L225 Difference]: With dead ends: 138 [2022-11-23 14:48:21,215 INFO L226 Difference]: Without dead ends: 101 [2022-11-23 14:48:21,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=216, Invalid=654, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:48:21,217 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 10 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:21,218 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 116 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:48:21,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-23 14:48:21,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 85. [2022-11-23 14:48:21,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 61 states have internal predecessors, (74), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-23 14:48:21,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 111 transitions. [2022-11-23 14:48:21,246 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 111 transitions. Word has length 47 [2022-11-23 14:48:21,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:21,247 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 111 transitions. [2022-11-23 14:48:21,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-23 14:48:21,247 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 111 transitions. [2022-11-23 14:48:21,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 14:48:21,249 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:21,249 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 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] [2022-11-23 14:48:21,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:21,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:21,461 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:21,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:21,461 INFO L85 PathProgramCache]: Analyzing trace with hash 170701079, now seen corresponding path program 1 times [2022-11-23 14:48:21,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:21,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416584703] [2022-11-23 14:48:21,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:21,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:21,473 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:21,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [641513070] [2022-11-23 14:48:21,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:21,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:21,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:21,475 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:21,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 14:48:21,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:21,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 14:48:21,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:21,602 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 14:48:21,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:21,734 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 14:48:21,734 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:21,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416584703] [2022-11-23 14:48:21,735 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:21,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641513070] [2022-11-23 14:48:21,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641513070] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:21,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [19450273] [2022-11-23 14:48:21,738 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-23 14:48:21,739 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:21,740 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:21,740 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:21,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:27,987 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2022-11-23 14:48:28,037 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:48:28,064 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:31,176 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3013#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:48:31,176 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:48:31,176 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:48:31,176 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-23 14:48:31,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534053452] [2022-11-23 14:48:31,177 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:48:31,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 14:48:31,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:31,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 14:48:31,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:48:31,178 INFO L87 Difference]: Start difference. First operand 85 states and 111 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 14:48:31,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:31,315 INFO L93 Difference]: Finished difference Result 105 states and 134 transitions. [2022-11-23 14:48:31,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:48:31,316 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2022-11-23 14:48:31,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:31,317 INFO L225 Difference]: With dead ends: 105 [2022-11-23 14:48:31,318 INFO L226 Difference]: Without dead ends: 103 [2022-11-23 14:48:31,318 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:48:31,319 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:31,320 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 84 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:48:31,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-23 14:48:31,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2022-11-23 14:48:31,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 71 states have (on average 1.2535211267605635) internal successors, (89), 74 states have internal predecessors, (89), 21 states have call successors, (21), 8 states have call predecessors, (21), 8 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-23 14:48:31,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 130 transitions. [2022-11-23 14:48:31,351 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 130 transitions. Word has length 48 [2022-11-23 14:48:31,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:31,352 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 130 transitions. [2022-11-23 14:48:31,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-23 14:48:31,352 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 130 transitions. [2022-11-23 14:48:31,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 14:48:31,354 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:31,354 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1] [2022-11-23 14:48:31,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:31,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 14:48:31,560 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:48:31,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:31,560 INFO L85 PathProgramCache]: Analyzing trace with hash -339484245, now seen corresponding path program 1 times [2022-11-23 14:48:31,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:31,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404355630] [2022-11-23 14:48:31,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:31,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:31,572 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:48:31,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1624178305] [2022-11-23 14:48:31,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:31,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:31,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:31,574 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:31,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 14:48:31,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:31,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 14:48:31,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:31,743 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:48:31,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:31,849 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:48:31,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:31,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404355630] [2022-11-23 14:48:31,849 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:48:31,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624178305] [2022-11-23 14:48:31,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624178305] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:31,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [344977816] [2022-11-23 14:48:31,855 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:48:31,855 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:31,855 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:31,856 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:31,856 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:37,306 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:48:41,256 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-23 14:48:41,324 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:48:41,345 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:59,553 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3627#(and (<= ~counter~0 52) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0))' at error location [2022-11-23 14:48:59,553 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:48:59,553 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:48:59,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-23 14:48:59,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277653145] [2022-11-23 14:48:59,553 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:48:59,554 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 14:48:59,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:59,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 14:48:59,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 14:48:59,555 INFO L87 Difference]: Start difference. First operand 101 states and 130 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:49:00,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:00,075 INFO L93 Difference]: Finished difference Result 508 states and 648 transitions. [2022-11-23 14:49:00,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-23 14:49:00,075 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 48 [2022-11-23 14:49:00,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:00,086 INFO L225 Difference]: With dead ends: 508 [2022-11-23 14:49:00,087 INFO L226 Difference]: Without dead ends: 501 [2022-11-23 14:49:00,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=302, Invalid=1590, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 14:49:00,089 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 273 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:00,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [273 Valid, 392 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:49:00,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2022-11-23 14:49:00,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 390. [2022-11-23 14:49:00,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 274 states have (on average 1.27007299270073) internal successors, (348), 284 states have internal predecessors, (348), 81 states have call successors, (81), 34 states have call predecessors, (81), 34 states have return successors, (76), 71 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-23 14:49:00,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 505 transitions. [2022-11-23 14:49:00,194 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 505 transitions. Word has length 48 [2022-11-23 14:49:00,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:00,194 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 505 transitions. [2022-11-23 14:49:00,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:49:00,195 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 505 transitions. [2022-11-23 14:49:00,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-23 14:49:00,197 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:00,197 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1] [2022-11-23 14:49:00,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:00,407 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:00,407 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:00,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:00,407 INFO L85 PathProgramCache]: Analyzing trace with hash -1953712133, now seen corresponding path program 1 times [2022-11-23 14:49:00,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:00,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461619663] [2022-11-23 14:49:00,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:00,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:00,421 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:49:00,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1652245085] [2022-11-23 14:49:00,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:00,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:00,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:00,427 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:00,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 14:49:00,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:00,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-23 14:49:00,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:01,316 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-23 14:49:01,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:02,377 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-23 14:49:02,378 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:02,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461619663] [2022-11-23 14:49:02,378 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:49:02,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652245085] [2022-11-23 14:49:02,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652245085] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:49:02,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1578340148] [2022-11-23 14:49:02,381 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:49:02,381 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:02,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:49:02,381 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:49:02,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:49:07,559 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:49:10,785 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-23 14:49:10,789 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:49:10,811 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:49:34,146 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5255#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:49:34,146 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:49:34,146 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:49:34,146 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2022-11-23 14:49:34,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975944027] [2022-11-23 14:49:34,147 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:49:34,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 14:49:34,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:34,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 14:49:34,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=2014, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 14:49:34,149 INFO L87 Difference]: Start difference. First operand 390 states and 505 transitions. Second operand has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-23 14:49:48,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:48,563 INFO L93 Difference]: Finished difference Result 845 states and 1155 transitions. [2022-11-23 14:49:48,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 14:49:48,564 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 49 [2022-11-23 14:49:48,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:48,567 INFO L225 Difference]: With dead ends: 845 [2022-11-23 14:49:48,568 INFO L226 Difference]: Without dead ends: 641 [2022-11-23 14:49:48,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 32.4s TimeCoverageRelationStatistics Valid=670, Invalid=5030, Unknown=0, NotChecked=0, Total=5700 [2022-11-23 14:49:48,571 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 301 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 1543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:48,571 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [307 Valid, 459 Invalid, 1543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 1295 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-11-23 14:49:48,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2022-11-23 14:49:48,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 501. [2022-11-23 14:49:48,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 364 states have (on average 1.3104395604395604) internal successors, (477), 371 states have internal predecessors, (477), 101 states have call successors, (101), 35 states have call predecessors, (101), 35 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-11-23 14:49:48,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 676 transitions. [2022-11-23 14:49:48,727 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 676 transitions. Word has length 49 [2022-11-23 14:49:48,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:48,727 INFO L495 AbstractCegarLoop]: Abstraction has 501 states and 676 transitions. [2022-11-23 14:49:48,728 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-23 14:49:48,728 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 676 transitions. [2022-11-23 14:49:48,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-23 14:49:48,729 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:48,729 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:48,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:48,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:48,936 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:49:48,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:48,936 INFO L85 PathProgramCache]: Analyzing trace with hash -324758054, now seen corresponding path program 1 times [2022-11-23 14:49:48,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:48,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534010238] [2022-11-23 14:49:48,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:48,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:48,946 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:49:48,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [352227293] [2022-11-23 14:49:48,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:48,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:48,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:48,948 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:48,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 14:49:49,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:49,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 14:49:49,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:49,069 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-23 14:49:49,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:49,150 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-23 14:49:49,150 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:49,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534010238] [2022-11-23 14:49:49,150 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:49:49,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352227293] [2022-11-23 14:49:49,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352227293] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:49:49,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1708623066] [2022-11-23 14:49:49,153 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-23 14:49:49,153 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:49,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:49:49,154 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:49:49,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:49:57,668 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-23 14:49:57,726 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:49:57,755 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:50:02,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7559#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:50:02,700 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:50:02,700 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:50:02,700 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-23 14:50:02,700 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787525730] [2022-11-23 14:50:02,700 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:50:02,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 14:50:02,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:50:02,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 14:50:02,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=880, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:50:02,702 INFO L87 Difference]: Start difference. First operand 501 states and 676 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:50:02,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:50:02,970 INFO L93 Difference]: Finished difference Result 533 states and 705 transitions. [2022-11-23 14:50:02,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:50:02,971 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 50 [2022-11-23 14:50:02,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:50:02,973 INFO L225 Difference]: With dead ends: 533 [2022-11-23 14:50:02,974 INFO L226 Difference]: Without dead ends: 531 [2022-11-23 14:50:02,975 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=128, Invalid=994, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 14:50:02,975 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:50:02,976 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 131 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:50:02,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2022-11-23 14:50:03,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 525. [2022-11-23 14:50:03,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 382 states have (on average 1.2958115183246073) internal successors, (495), 389 states have internal predecessors, (495), 101 states have call successors, (101), 41 states have call predecessors, (101), 41 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-11-23 14:50:03,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 694 transitions. [2022-11-23 14:50:03,134 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 694 transitions. Word has length 50 [2022-11-23 14:50:03,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:50:03,135 INFO L495 AbstractCegarLoop]: Abstraction has 525 states and 694 transitions. [2022-11-23 14:50:03,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:50:03,135 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 694 transitions. [2022-11-23 14:50:03,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-23 14:50:03,137 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:50:03,137 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1] [2022-11-23 14:50:03,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 14:50:03,342 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-23 14:50:03,343 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:50:03,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:50:03,343 INFO L85 PathProgramCache]: Analyzing trace with hash -1947795252, now seen corresponding path program 1 times [2022-11-23 14:50:03,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:50:03,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662391921] [2022-11-23 14:50:03,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:03,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:50:03,355 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:50:03,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1300660797] [2022-11-23 14:50:03,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:03,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:03,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:50:03,357 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:50:03,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 14:50:03,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:50:03,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-23 14:50:03,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:50:03,491 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 14:50:03,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:50:03,575 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-23 14:50:03,575 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:50:03,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662391921] [2022-11-23 14:50:03,575 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:50:03,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300660797] [2022-11-23 14:50:03,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300660797] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:50:03,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [372104788] [2022-11-23 14:50:03,578 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:50:03,578 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:50:03,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:50:03,579 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:50:03,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:50:27,233 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:50:27,238 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:50:27,261 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:50:32,020 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9414#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:50:32,021 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:50:32,021 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:50:32,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-23 14:50:32,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213094843] [2022-11-23 14:50:32,021 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:50:32,022 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-23 14:50:32,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:50:32,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-23 14:50:32,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1063, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 14:50:32,023 INFO L87 Difference]: Start difference. First operand 525 states and 694 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:50:32,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:50:32,528 INFO L93 Difference]: Finished difference Result 790 states and 1036 transitions. [2022-11-23 14:50:32,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 14:50:32,529 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 55 [2022-11-23 14:50:32,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:50:32,533 INFO L225 Difference]: With dead ends: 790 [2022-11-23 14:50:32,533 INFO L226 Difference]: Without dead ends: 528 [2022-11-23 14:50:32,535 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 602 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=239, Invalid=1401, Unknown=0, NotChecked=0, Total=1640 [2022-11-23 14:50:32,535 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 139 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:50:32,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 252 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:50:32,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2022-11-23 14:50:32,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 503. [2022-11-23 14:50:32,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 363 states have (on average 1.2506887052341598) internal successors, (454), 368 states have internal predecessors, (454), 98 states have call successors, (98), 41 states have call predecessors, (98), 41 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-11-23 14:50:32,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 648 transitions. [2022-11-23 14:50:32,696 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 648 transitions. Word has length 55 [2022-11-23 14:50:32,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:50:32,697 INFO L495 AbstractCegarLoop]: Abstraction has 503 states and 648 transitions. [2022-11-23 14:50:32,697 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:50:32,697 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 648 transitions. [2022-11-23 14:50:32,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-23 14:50:32,699 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:50:32,699 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 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] [2022-11-23 14:50:32,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 14:50:32,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-23 14:50:32,906 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:50:32,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:50:32,906 INFO L85 PathProgramCache]: Analyzing trace with hash -897475049, now seen corresponding path program 2 times [2022-11-23 14:50:32,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:50:32,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091739652] [2022-11-23 14:50:32,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:32,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:50:32,929 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:50:32,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1510480867] [2022-11-23 14:50:32,939 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:50:32,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:32,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:50:32,952 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:50:32,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 14:50:33,015 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:50:33,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:50:33,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-23 14:50:33,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:50:33,163 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2022-11-23 14:50:33,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:50:33,270 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-23 14:50:33,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:50:33,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091739652] [2022-11-23 14:50:33,271 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:50:33,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510480867] [2022-11-23 14:50:33,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510480867] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 14:50:33,271 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:50:33,271 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 12 [2022-11-23 14:50:33,271 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655974172] [2022-11-23 14:50:33,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:50:33,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:50:33,272 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:50:33,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:50:33,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-23 14:50:33,273 INFO L87 Difference]: Start difference. First operand 503 states and 648 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:50:33,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:50:33,529 INFO L93 Difference]: Finished difference Result 544 states and 686 transitions. [2022-11-23 14:50:33,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:50:33,529 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 58 [2022-11-23 14:50:33,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:50:33,533 INFO L225 Difference]: With dead ends: 544 [2022-11-23 14:50:33,533 INFO L226 Difference]: Without dead ends: 542 [2022-11-23 14:50:33,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-23 14:50:33,534 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 11 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:50:33,535 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 111 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:50:33,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2022-11-23 14:50:33,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 535. [2022-11-23 14:50:33,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 387 states have (on average 1.2299741602067182) internal successors, (476), 392 states have internal predecessors, (476), 98 states have call successors, (98), 49 states have call predecessors, (98), 49 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-11-23 14:50:33,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 670 transitions. [2022-11-23 14:50:33,725 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 670 transitions. Word has length 58 [2022-11-23 14:50:33,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:50:33,725 INFO L495 AbstractCegarLoop]: Abstraction has 535 states and 670 transitions. [2022-11-23 14:50:33,726 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:50:33,726 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 670 transitions. [2022-11-23 14:50:33,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-23 14:50:33,727 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:50:33,727 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 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] [2022-11-23 14:50:33,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 14:50:33,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:33,928 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:50:33,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:50:33,928 INFO L85 PathProgramCache]: Analyzing trace with hash 1281872666, now seen corresponding path program 2 times [2022-11-23 14:50:33,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:50:33,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956435859] [2022-11-23 14:50:33,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:33,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:50:33,940 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:50:33,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [377173295] [2022-11-23 14:50:33,940 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:50:33,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:33,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:50:33,944 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:50:33,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 14:50:34,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:50:34,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:50:34,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 14:50:34,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:50:34,177 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-23 14:50:34,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:50:34,298 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-23 14:50:34,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:50:34,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956435859] [2022-11-23 14:50:34,298 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:50:34,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377173295] [2022-11-23 14:50:34,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [377173295] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 14:50:34,298 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:50:34,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2022-11-23 14:50:34,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323079471] [2022-11-23 14:50:34,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:50:34,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:50:34,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:50:34,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:50:34,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2022-11-23 14:50:34,300 INFO L87 Difference]: Start difference. First operand 535 states and 670 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:50:34,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:50:34,605 INFO L93 Difference]: Finished difference Result 613 states and 770 transitions. [2022-11-23 14:50:34,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:50:34,605 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 60 [2022-11-23 14:50:34,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:50:34,609 INFO L225 Difference]: With dead ends: 613 [2022-11-23 14:50:34,609 INFO L226 Difference]: Without dead ends: 611 [2022-11-23 14:50:34,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-23 14:50:34,611 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 8 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:50:34,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 109 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:50:34,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2022-11-23 14:50:34,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 602. [2022-11-23 14:50:34,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 428 states have (on average 1.2289719626168225) internal successors, (526), 434 states have internal predecessors, (526), 116 states have call successors, (116), 57 states have call predecessors, (116), 57 states have return successors, (114), 110 states have call predecessors, (114), 114 states have call successors, (114) [2022-11-23 14:50:34,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 756 transitions. [2022-11-23 14:50:34,853 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 756 transitions. Word has length 60 [2022-11-23 14:50:34,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:50:34,854 INFO L495 AbstractCegarLoop]: Abstraction has 602 states and 756 transitions. [2022-11-23 14:50:34,854 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-23 14:50:34,854 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 756 transitions. [2022-11-23 14:50:34,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-23 14:50:34,856 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:50:34,857 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 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, 1, 1, 1] [2022-11-23 14:50:34,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 14:50:35,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 14:50:35,063 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:50:35,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:50:35,063 INFO L85 PathProgramCache]: Analyzing trace with hash 1844245864, now seen corresponding path program 1 times [2022-11-23 14:50:35,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:50:35,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656343984] [2022-11-23 14:50:35,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:35,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:50:35,081 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:50:35,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1341603099] [2022-11-23 14:50:35,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:50:35,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:35,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:50:35,103 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:50:35,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 14:50:35,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:50:35,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-23 14:50:35,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:50:35,284 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:50:35,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:50:35,431 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:50:35,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:50:35,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656343984] [2022-11-23 14:50:35,432 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:50:35,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341603099] [2022-11-23 14:50:35,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1341603099] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:50:35,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [537064375] [2022-11-23 14:50:35,434 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:50:35,434 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:50:35,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:50:35,435 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:50:35,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:50:40,811 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:50:45,647 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:50:45,652 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:50:45,676 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:51:05,444 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15591#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:51:05,444 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:51:05,444 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:51:05,444 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2022-11-23 14:51:05,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088634113] [2022-11-23 14:51:05,445 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:51:05,445 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 14:51:05,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:51:05,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 14:51:05,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1151, Unknown=0, NotChecked=0, Total=1406 [2022-11-23 14:51:05,447 INFO L87 Difference]: Start difference. First operand 602 states and 756 transitions. Second operand has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:51:06,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:51:06,515 INFO L93 Difference]: Finished difference Result 1248 states and 1622 transitions. [2022-11-23 14:51:06,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 14:51:06,516 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 60 [2022-11-23 14:51:06,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:51:06,521 INFO L225 Difference]: With dead ends: 1248 [2022-11-23 14:51:06,521 INFO L226 Difference]: Without dead ends: 1097 [2022-11-23 14:51:06,523 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 827 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=368, Invalid=1794, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 14:51:06,524 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 289 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:51:06,524 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 355 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:51:06,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1097 states. [2022-11-23 14:51:06,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1097 to 1030. [2022-11-23 14:51:06,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1030 states, 720 states have (on average 1.2166666666666666) internal successors, (876), 735 states have internal predecessors, (876), 219 states have call successors, (219), 90 states have call predecessors, (219), 90 states have return successors, (214), 204 states have call predecessors, (214), 214 states have call successors, (214) [2022-11-23 14:51:06,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1030 states to 1030 states and 1309 transitions. [2022-11-23 14:51:06,887 INFO L78 Accepts]: Start accepts. Automaton has 1030 states and 1309 transitions. Word has length 60 [2022-11-23 14:51:06,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:51:06,887 INFO L495 AbstractCegarLoop]: Abstraction has 1030 states and 1309 transitions. [2022-11-23 14:51:06,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:51:06,888 INFO L276 IsEmpty]: Start isEmpty. Operand 1030 states and 1309 transitions. [2022-11-23 14:51:06,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 14:51:06,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:51:06,889 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 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] [2022-11-23 14:51:06,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-11-23 14:51:07,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 14:51:07,096 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:51:07,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:51:07,096 INFO L85 PathProgramCache]: Analyzing trace with hash 186118403, now seen corresponding path program 1 times [2022-11-23 14:51:07,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:51:07,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631227170] [2022-11-23 14:51:07,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:07,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:51:07,106 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:51:07,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1772915407] [2022-11-23 14:51:07,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:07,107 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:51:07,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:51:07,108 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:51:07,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 14:51:07,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:51:07,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-23 14:51:07,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:51:08,130 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-23 14:51:08,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:51:08,814 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-23 14:51:08,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:51:08,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631227170] [2022-11-23 14:51:08,814 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:51:08,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772915407] [2022-11-23 14:51:08,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772915407] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:51:08,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2069622342] [2022-11-23 14:51:08,816 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:51:08,817 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:51:08,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:51:08,817 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:51:08,818 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:51:13,449 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:51:17,431 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:51:17,436 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:51:17,457 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:51:39,288 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19262#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:51:39,289 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:51:39,289 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:51:39,289 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2022-11-23 14:51:39,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341498397] [2022-11-23 14:51:39,289 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:51:39,290 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 14:51:39,290 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:51:39,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 14:51:39,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1708, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 14:51:39,291 INFO L87 Difference]: Start difference. First operand 1030 states and 1309 transitions. Second operand has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-23 14:52:24,284 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 [] [2022-11-23 14:52:54,080 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:52:54,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:52:54,224 INFO L93 Difference]: Finished difference Result 1748 states and 2329 transitions. [2022-11-23 14:52:54,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-23 14:52:54,225 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 61 [2022-11-23 14:52:54,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:52:54,231 INFO L225 Difference]: With dead ends: 1748 [2022-11-23 14:52:54,232 INFO L226 Difference]: Without dead ends: 1420 [2022-11-23 14:52:54,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 159 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1872 ImplicationChecksByTransitivity, 72.1s TimeCoverageRelationStatistics Valid=687, Invalid=5632, Unknown=1, NotChecked=0, Total=6320 [2022-11-23 14:52:54,235 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 344 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 1446 mSolverCounterSat, 306 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 348 SdHoareTripleChecker+Valid, 696 SdHoareTripleChecker+Invalid, 1753 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 306 IncrementalHoareTripleChecker+Valid, 1446 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.9s IncrementalHoareTripleChecker+Time [2022-11-23 14:52:54,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [348 Valid, 696 Invalid, 1753 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [306 Valid, 1446 Invalid, 1 Unknown, 0 Unchecked, 24.9s Time] [2022-11-23 14:52:54,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2022-11-23 14:52:54,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 1146. [2022-11-23 14:52:54,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1146 states, 813 states have (on average 1.2533825338253382) internal successors, (1019), 835 states have internal predecessors, (1019), 247 states have call successors, (247), 85 states have call predecessors, (247), 85 states have return successors, (242), 225 states have call predecessors, (242), 242 states have call successors, (242) [2022-11-23 14:52:54,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1146 states to 1146 states and 1508 transitions. [2022-11-23 14:52:54,781 INFO L78 Accepts]: Start accepts. Automaton has 1146 states and 1508 transitions. Word has length 61 [2022-11-23 14:52:54,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:52:54,782 INFO L495 AbstractCegarLoop]: Abstraction has 1146 states and 1508 transitions. [2022-11-23 14:52:54,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-23 14:52:54,782 INFO L276 IsEmpty]: Start isEmpty. Operand 1146 states and 1508 transitions. [2022-11-23 14:52:54,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 14:52:54,783 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:52:54,783 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 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] [2022-11-23 14:52:54,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 14:52:54,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:54,990 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:52:54,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:52:54,990 INFO L85 PathProgramCache]: Analyzing trace with hash 1039137595, now seen corresponding path program 2 times [2022-11-23 14:52:54,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:52:54,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554909877] [2022-11-23 14:52:54,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:54,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:52:54,999 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:52:55,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1996005412] [2022-11-23 14:52:55,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:52:55,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:55,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:52:55,001 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:52:55,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 14:52:55,059 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:52:55,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:52:55,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 14:52:55,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:52:55,082 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-23 14:52:55,083 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:52:55,083 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:52:55,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554909877] [2022-11-23 14:52:55,083 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:52:55,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996005412] [2022-11-23 14:52:55,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996005412] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:52:55,083 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:52:55,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:52:55,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158348368] [2022-11-23 14:52:55,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:52:55,084 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:52:55,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:52:55,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:52:55,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:52:55,085 INFO L87 Difference]: Start difference. First operand 1146 states and 1508 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-23 14:52:55,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:52:55,557 INFO L93 Difference]: Finished difference Result 1441 states and 1900 transitions. [2022-11-23 14:52:55,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:52:55,557 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 61 [2022-11-23 14:52:55,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:52:55,562 INFO L225 Difference]: With dead ends: 1441 [2022-11-23 14:52:55,563 INFO L226 Difference]: Without dead ends: 1209 [2022-11-23 14:52:55,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:52:55,565 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 30 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:52:55,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 137 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:52:55,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1209 states. [2022-11-23 14:52:55,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1209 to 1010. [2022-11-23 14:52:55,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1010 states, 719 states have (on average 1.228094575799722) internal successors, (883), 732 states have internal predecessors, (883), 205 states have call successors, (205), 85 states have call predecessors, (205), 85 states have return successors, (200), 192 states have call predecessors, (200), 200 states have call successors, (200) [2022-11-23 14:52:55,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1010 states to 1010 states and 1288 transitions. [2022-11-23 14:52:55,962 INFO L78 Accepts]: Start accepts. Automaton has 1010 states and 1288 transitions. Word has length 61 [2022-11-23 14:52:55,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:52:55,963 INFO L495 AbstractCegarLoop]: Abstraction has 1010 states and 1288 transitions. [2022-11-23 14:52:55,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-23 14:52:55,963 INFO L276 IsEmpty]: Start isEmpty. Operand 1010 states and 1288 transitions. [2022-11-23 14:52:55,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-23 14:52:55,964 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:52:55,964 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 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] [2022-11-23 14:52:55,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 14:52:56,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:56,170 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:52:56,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:52:56,171 INFO L85 PathProgramCache]: Analyzing trace with hash 1945599548, now seen corresponding path program 3 times [2022-11-23 14:52:56,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:52:56,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167599691] [2022-11-23 14:52:56,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:56,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:52:56,185 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:52:56,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1158204396] [2022-11-23 14:52:56,186 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:52:56,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:56,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:52:56,187 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:52:56,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 14:52:56,257 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:52:56,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:52:56,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:52:56,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:52:56,296 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-23 14:52:56,297 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:52:56,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:52:56,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167599691] [2022-11-23 14:52:56,297 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:52:56,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158204396] [2022-11-23 14:52:56,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158204396] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:52:56,298 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:52:56,298 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:52:56,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18051871] [2022-11-23 14:52:56,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:52:56,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:52:56,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:52:56,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:52:56,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:52:56,299 INFO L87 Difference]: Start difference. First operand 1010 states and 1288 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 14:52:56,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:52:56,729 INFO L93 Difference]: Finished difference Result 1627 states and 2121 transitions. [2022-11-23 14:52:56,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:52:56,730 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 64 [2022-11-23 14:52:56,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:52:56,735 INFO L225 Difference]: With dead ends: 1627 [2022-11-23 14:52:56,735 INFO L226 Difference]: Without dead ends: 1176 [2022-11-23 14:52:56,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:52:56,738 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 12 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:52:56,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 116 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:52:56,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1176 states. [2022-11-23 14:52:57,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1176 to 1126. [2022-11-23 14:52:57,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 787 states have (on average 1.2325285895806861) internal successors, (970), 796 states have internal predecessors, (970), 253 states have call successors, (253), 85 states have call predecessors, (253), 85 states have return successors, (248), 244 states have call predecessors, (248), 248 states have call successors, (248) [2022-11-23 14:52:57,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1471 transitions. [2022-11-23 14:52:57,267 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1471 transitions. Word has length 64 [2022-11-23 14:52:57,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:52:57,268 INFO L495 AbstractCegarLoop]: Abstraction has 1126 states and 1471 transitions. [2022-11-23 14:52:57,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-23 14:52:57,268 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1471 transitions. [2022-11-23 14:52:57,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-23 14:52:57,269 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:52:57,269 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 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] [2022-11-23 14:52:57,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 14:52:57,475 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:57,475 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:52:57,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:52:57,476 INFO L85 PathProgramCache]: Analyzing trace with hash -1497093235, now seen corresponding path program 4 times [2022-11-23 14:52:57,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:52:57,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305987214] [2022-11-23 14:52:57,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:57,476 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:52:57,484 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:52:57,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [77878115] [2022-11-23 14:52:57,484 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:52:57,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:57,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:52:57,490 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:52:57,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-23 14:52:57,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:52:57,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-23 14:52:57,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:52:58,671 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-23 14:52:58,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:53:00,114 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 26 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-23 14:53:00,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:53:00,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305987214] [2022-11-23 14:53:00,115 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:53:00,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77878115] [2022-11-23 14:53:00,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77878115] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:53:00,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1434403924] [2022-11-23 14:53:00,117 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:53:00,117 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:53:00,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:53:00,117 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:53:00,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:53:04,799 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:53:08,172 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:53:08,177 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:53:08,198 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:53:31,550 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31791#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:53:31,550 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:53:31,550 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:53:31,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 28 [2022-11-23 14:53:31,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183083243] [2022-11-23 14:53:31,550 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:53:31,551 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-23 14:53:31,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:53:31,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-23 14:53:31,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=2173, Unknown=0, NotChecked=0, Total=2450 [2022-11-23 14:53:31,552 INFO L87 Difference]: Start difference. First operand 1126 states and 1471 transitions. Second operand has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-23 14:54:06,894 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:54:26,582 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 [] [2022-11-23 14:54:40,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:54:40,241 INFO L93 Difference]: Finished difference Result 1694 states and 2285 transitions. [2022-11-23 14:54:40,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-23 14:54:40,242 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) Word has length 66 [2022-11-23 14:54:40,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:54:40,247 INFO L225 Difference]: With dead ends: 1694 [2022-11-23 14:54:40,248 INFO L226 Difference]: Without dead ends: 1688 [2022-11-23 14:54:40,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2449 ImplicationChecksByTransitivity, 56.9s TimeCoverageRelationStatistics Valid=1107, Invalid=6549, Unknown=0, NotChecked=0, Total=7656 [2022-11-23 14:54:40,251 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 537 mSDsluCounter, 800 mSDsCounter, 0 mSdLazyCounter, 1456 mSolverCounterSat, 447 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 538 SdHoareTripleChecker+Valid, 896 SdHoareTripleChecker+Invalid, 1904 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 447 IncrementalHoareTripleChecker+Valid, 1456 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 35.7s IncrementalHoareTripleChecker+Time [2022-11-23 14:54:40,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [538 Valid, 896 Invalid, 1904 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [447 Valid, 1456 Invalid, 1 Unknown, 0 Unchecked, 35.7s Time] [2022-11-23 14:54:40,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1688 states. [2022-11-23 14:54:41,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1688 to 1430. [2022-11-23 14:54:41,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1430 states, 1014 states have (on average 1.2504930966469427) internal successors, (1268), 1022 states have internal predecessors, (1268), 310 states have call successors, (310), 106 states have call predecessors, (310), 105 states have return successors, (306), 301 states have call predecessors, (306), 306 states have call successors, (306) [2022-11-23 14:54:41,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1430 states to 1430 states and 1884 transitions. [2022-11-23 14:54:41,028 INFO L78 Accepts]: Start accepts. Automaton has 1430 states and 1884 transitions. Word has length 66 [2022-11-23 14:54:41,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:54:41,028 INFO L495 AbstractCegarLoop]: Abstraction has 1430 states and 1884 transitions. [2022-11-23 14:54:41,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-23 14:54:41,029 INFO L276 IsEmpty]: Start isEmpty. Operand 1430 states and 1884 transitions. [2022-11-23 14:54:41,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-23 14:54:41,030 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:54:41,030 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 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, 1, 1] [2022-11-23 14:54:41,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-23 14:54:41,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:54:41,236 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:54:41,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:54:41,236 INFO L85 PathProgramCache]: Analyzing trace with hash 1524056252, now seen corresponding path program 1 times [2022-11-23 14:54:41,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:54:41,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962380681] [2022-11-23 14:54:41,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:41,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:54:41,245 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:54:41,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1318407985] [2022-11-23 14:54:41,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:41,245 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:54:41,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:54:41,247 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:54:41,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-23 14:54:41,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:54:41,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-23 14:54:41,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:54:41,433 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:54:41,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:54:41,620 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-23 14:54:41,620 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:54:41,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962380681] [2022-11-23 14:54:41,620 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:54:41,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318407985] [2022-11-23 14:54:41,621 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1318407985] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:54:41,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1779632688] [2022-11-23 14:54:41,622 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:54:41,623 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:54:41,623 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:54:41,623 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:54:41,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:54:46,290 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:54:46,291 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2022-11-23 14:54:47,925 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:54:47,929 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:54:47,949 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:54:57,296 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36805#(and (<= ~counter~0 52) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:54:57,296 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:54:57,296 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:54:57,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-23 14:54:57,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494972933] [2022-11-23 14:54:57,297 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:54:57,297 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 14:54:57,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:54:57,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 14:54:57,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1673, Unknown=0, NotChecked=0, Total=2070 [2022-11-23 14:54:57,299 INFO L87 Difference]: Start difference. First operand 1430 states and 1884 transitions. Second operand has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:54:59,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:54:59,663 INFO L93 Difference]: Finished difference Result 3913 states and 5424 transitions. [2022-11-23 14:54:59,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 14:54:59,664 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 68 [2022-11-23 14:54:59,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:54:59,677 INFO L225 Difference]: With dead ends: 3913 [2022-11-23 14:54:59,677 INFO L226 Difference]: Without dead ends: 3390 [2022-11-23 14:54:59,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 157 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=674, Invalid=2986, Unknown=0, NotChecked=0, Total=3660 [2022-11-23 14:54:59,680 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 723 mSDsluCounter, 479 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 358 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 723 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 358 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:54:59,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [723 Valid, 571 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [358 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:54:59,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3390 states. [2022-11-23 14:55:01,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3390 to 3265. [2022-11-23 14:55:01,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3265 states, 2334 states have (on average 1.2609254498714653) internal successors, (2943), 2349 states have internal predecessors, (2943), 736 states have call successors, (736), 195 states have call predecessors, (736), 194 states have return successors, (726), 720 states have call predecessors, (726), 726 states have call successors, (726) [2022-11-23 14:55:01,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3265 states to 3265 states and 4405 transitions. [2022-11-23 14:55:01,197 INFO L78 Accepts]: Start accepts. Automaton has 3265 states and 4405 transitions. Word has length 68 [2022-11-23 14:55:01,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:55:01,197 INFO L495 AbstractCegarLoop]: Abstraction has 3265 states and 4405 transitions. [2022-11-23 14:55:01,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-23 14:55:01,198 INFO L276 IsEmpty]: Start isEmpty. Operand 3265 states and 4405 transitions. [2022-11-23 14:55:01,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-23 14:55:01,199 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:55:01,199 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 2, 2, 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] [2022-11-23 14:55:01,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-23 14:55:01,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:01,404 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:55:01,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:55:01,404 INFO L85 PathProgramCache]: Analyzing trace with hash 689077281, now seen corresponding path program 1 times [2022-11-23 14:55:01,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:55:01,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664044019] [2022-11-23 14:55:01,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:01,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:55:01,412 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:55:01,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1618795175] [2022-11-23 14:55:01,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:55:01,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:55:01,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:55:01,420 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:55:01,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-23 14:55:01,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:55:01,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-23 14:55:01,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:55:02,731 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 34 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-23 14:55:02,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:55:06,643 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 33 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-11-23 14:55:06,643 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:55:06,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664044019] [2022-11-23 14:55:06,644 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:55:06,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1618795175] [2022-11-23 14:55:06,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1618795175] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:55:06,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1626705433] [2022-11-23 14:55:06,646 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:55:06,646 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:55:06,646 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:55:06,646 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:55:06,646 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:56:00,457 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:56:00,462 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:56:00,482 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:56:17,695 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47699#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:56:17,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:56:17,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:56:17,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2022-11-23 14:56:17,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869656582] [2022-11-23 14:56:17,695 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:56:17,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 14:56:17,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:56:17,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 14:56:17,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=2713, Unknown=0, NotChecked=0, Total=2970 [2022-11-23 14:56:17,697 INFO L87 Difference]: Start difference. First operand 3265 states and 4405 transitions. Second operand has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 14:57:14,109 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:58:12,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:12,399 INFO L93 Difference]: Finished difference Result 5368 states and 7465 transitions. [2022-11-23 14:58:12,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-11-23 14:58:12,400 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 79 [2022-11-23 14:58:12,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:12,420 INFO L225 Difference]: With dead ends: 5368 [2022-11-23 14:58:12,420 INFO L226 Difference]: Without dead ends: 5317 [2022-11-23 14:58:12,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 180 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7114 ImplicationChecksByTransitivity, 97.9s TimeCoverageRelationStatistics Valid=2802, Invalid=16658, Unknown=0, NotChecked=0, Total=19460 [2022-11-23 14:58:12,426 INFO L413 NwaCegarLoop]: 97 mSDtfsCounter, 718 mSDsluCounter, 996 mSDsCounter, 0 mSdLazyCounter, 2581 mSolverCounterSat, 759 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 718 SdHoareTripleChecker+Valid, 1093 SdHoareTripleChecker+Invalid, 3340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 759 IncrementalHoareTripleChecker+Valid, 2581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:12,426 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [718 Valid, 1093 Invalid, 3340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [759 Valid, 2581 Invalid, 0 Unknown, 0 Unchecked, 32.6s Time] [2022-11-23 14:58:12,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5317 states. [2022-11-23 14:58:15,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5317 to 4128. [2022-11-23 14:58:15,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4128 states, 3001 states have (on average 1.279573475508164) internal successors, (3840), 3014 states have internal predecessors, (3840), 902 states have call successors, (902), 225 states have call predecessors, (902), 224 states have return successors, (892), 888 states have call predecessors, (892), 892 states have call successors, (892) [2022-11-23 14:58:15,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4128 states to 4128 states and 5634 transitions. [2022-11-23 14:58:15,569 INFO L78 Accepts]: Start accepts. Automaton has 4128 states and 5634 transitions. Word has length 79 [2022-11-23 14:58:15,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:15,569 INFO L495 AbstractCegarLoop]: Abstraction has 4128 states and 5634 transitions. [2022-11-23 14:58:15,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-23 14:58:15,570 INFO L276 IsEmpty]: Start isEmpty. Operand 4128 states and 5634 transitions. [2022-11-23 14:58:15,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-11-23 14:58:15,572 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:15,572 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:15,582 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-11-23 14:58:15,777 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:15,777 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:15,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:15,778 INFO L85 PathProgramCache]: Analyzing trace with hash 1576694894, now seen corresponding path program 2 times [2022-11-23 14:58:15,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:15,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111605463] [2022-11-23 14:58:15,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:15,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:15,789 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:58:15,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [269916647] [2022-11-23 14:58:15,790 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:58:15,790 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:15,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:15,791 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:15,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-23 14:58:15,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 14:58:15,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:58:15,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-23 14:58:15,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 120 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-23 14:58:16,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:58:16,307 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 56 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-23 14:58:16,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:16,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111605463] [2022-11-23 14:58:16,308 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:58:16,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269916647] [2022-11-23 14:58:16,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269916647] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:58:16,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [634730647] [2022-11-23 14:58:16,310 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:58:16,310 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:58:16,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:58:16,310 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:58:16,311 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:58:21,054 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:58:24,764 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 14:58:24,768 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:58:24,789 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:58:45,123 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62191#(and (<= ~counter~0 52) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-23 14:58:45,123 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:58:45,123 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:58:45,123 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-11-23 14:58:45,123 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431123994] [2022-11-23 14:58:45,123 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:58:45,124 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 14:58:45,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:58:45,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 14:58:45,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=1856, Unknown=0, NotChecked=0, Total=2352 [2022-11-23 14:58:45,125 INFO L87 Difference]: Start difference. First operand 4128 states and 5634 transitions. Second operand has 26 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 26 states have internal predecessors, (92), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-23 14:58:51,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:58:51,391 INFO L93 Difference]: Finished difference Result 6552 states and 9156 transitions. [2022-11-23 14:58:51,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-23 14:58:51,392 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 26 states have internal predecessors, (92), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) Word has length 89 [2022-11-23 14:58:51,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:58:51,417 INFO L225 Difference]: With dead ends: 6552 [2022-11-23 14:58:51,418 INFO L226 Difference]: Without dead ends: 6510 [2022-11-23 14:58:51,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 214 SyntacticMatches, 4 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=926, Invalid=3630, Unknown=0, NotChecked=0, Total=4556 [2022-11-23 14:58:51,421 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 730 mSDsluCounter, 603 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 330 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 730 SdHoareTripleChecker+Valid, 717 SdHoareTripleChecker+Invalid, 780 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 330 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:58:51,421 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [730 Valid, 717 Invalid, 780 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [330 Valid, 450 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 14:58:51,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6510 states. [2022-11-23 14:58:56,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6510 to 6280. [2022-11-23 14:58:56,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6280 states, 4631 states have (on average 1.2709997840639171) internal successors, (5886), 4683 states have internal predecessors, (5886), 1355 states have call successors, (1355), 294 states have call predecessors, (1355), 293 states have return successors, (1341), 1302 states have call predecessors, (1341), 1341 states have call successors, (1341) [2022-11-23 14:58:56,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6280 states to 6280 states and 8582 transitions. [2022-11-23 14:58:56,068 INFO L78 Accepts]: Start accepts. Automaton has 6280 states and 8582 transitions. Word has length 89 [2022-11-23 14:58:56,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:58:56,068 INFO L495 AbstractCegarLoop]: Abstraction has 6280 states and 8582 transitions. [2022-11-23 14:58:56,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 26 states have internal predecessors, (92), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-23 14:58:56,069 INFO L276 IsEmpty]: Start isEmpty. Operand 6280 states and 8582 transitions. [2022-11-23 14:58:56,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-23 14:58:56,071 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:58:56,071 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:58:56,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-23 14:58:56,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-23 14:58:56,277 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:58:56,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:58:56,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1613266328, now seen corresponding path program 2 times [2022-11-23 14:58:56,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:58:56,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685351050] [2022-11-23 14:58:56,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:58:56,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:58:56,286 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:58:56,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1030010614] [2022-11-23 14:58:56,286 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:58:56,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:58:56,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:58:56,289 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:58:56,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-23 14:58:56,349 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:58:56,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:58:56,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 14:58:56,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:58:56,413 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-11-23 14:58:56,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:58:56,494 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-11-23 14:58:56,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:58:56,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685351050] [2022-11-23 14:58:56,494 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:58:56,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030010614] [2022-11-23 14:58:56,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1030010614] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:58:56,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [43799783] [2022-11-23 14:58:56,496 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:58:56,496 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:58:56,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:58:56,496 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:58:56,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:59:01,310 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-23 14:59:05,126 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-23 14:59:05,129 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 14:59:05,153 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:59:25,091 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '81226#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:59:25,091 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:59:25,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:59:25,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-11-23 14:59:25,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736069567] [2022-11-23 14:59:25,092 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:25,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 14:59:25,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:25,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 14:59:25,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:59:25,094 INFO L87 Difference]: Start difference. First operand 6280 states and 8582 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 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) [2022-11-23 14:59:32,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:32,867 INFO L93 Difference]: Finished difference Result 8867 states and 12580 transitions. [2022-11-23 14:59:32,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 14:59:32,867 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 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 90 [2022-11-23 14:59:32,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:32,902 INFO L225 Difference]: With dead ends: 8867 [2022-11-23 14:59:32,903 INFO L226 Difference]: Without dead ends: 8805 [2022-11-23 14:59:32,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 237 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=223, Invalid=1669, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 14:59:32,907 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 120 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:32,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 366 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:59:32,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8805 states. [2022-11-23 14:59:37,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8805 to 6253. [2022-11-23 14:59:37,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6253 states, 4535 states have (on average 1.2776185226019845) internal successors, (5794), 4596 states have internal predecessors, (5794), 1424 states have call successors, (1424), 294 states have call predecessors, (1424), 293 states have return successors, (1410), 1362 states have call predecessors, (1410), 1410 states have call successors, (1410) [2022-11-23 14:59:37,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6253 states to 6253 states and 8628 transitions. [2022-11-23 14:59:37,976 INFO L78 Accepts]: Start accepts. Automaton has 6253 states and 8628 transitions. Word has length 90 [2022-11-23 14:59:37,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:37,977 INFO L495 AbstractCegarLoop]: Abstraction has 6253 states and 8628 transitions. [2022-11-23 14:59:37,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 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) [2022-11-23 14:59:37,978 INFO L276 IsEmpty]: Start isEmpty. Operand 6253 states and 8628 transitions. [2022-11-23 14:59:37,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-23 14:59:37,980 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:37,980 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 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] [2022-11-23 14:59:37,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:38,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-23 14:59:38,186 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:59:38,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:38,186 INFO L85 PathProgramCache]: Analyzing trace with hash -307282759, now seen corresponding path program 2 times [2022-11-23 14:59:38,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:38,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678044864] [2022-11-23 14:59:38,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:38,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:38,194 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:59:38,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1507303703] [2022-11-23 14:59:38,194 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:59:38,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:38,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:38,196 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:38,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b19e78d3-bc72-4d96-aecf-cc4fdc94f69e/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-23 14:59:38,287 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 14:59:38,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:38,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-23 14:59:38,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:39,693 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 35 refuted. 0 times theorem prover too weak. 265 trivial. 0 not checked. [2022-11-23 14:59:39,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:41,626 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 34 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-11-23 14:59:41,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:41,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678044864] [2022-11-23 14:59:41,626 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:59:41,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507303703] [2022-11-23 14:59:41,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1507303703] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:41,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [402145185] [2022-11-23 14:59:41,628 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:59:41,628 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:41,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:59:41,629 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:59:41,629 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:00:07,383 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2022-11-23 15:00:07,415 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-23 15:00:07,436 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:00:11,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '103838#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|))' at error location [2022-11-23 15:00:11,857 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 15:00:11,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 15:00:11,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2022-11-23 15:00:11,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134435978] [2022-11-23 15:00:11,857 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 15:00:11,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-23 15:00:11,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:00:11,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-23 15:00:11,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=2198, Unknown=0, NotChecked=0, Total=2450 [2022-11-23 15:00:11,859 INFO L87 Difference]: Start difference. First operand 6253 states and 8628 transitions. Second operand has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-11-23 15:00:41,902 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 15:00:47,800 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []