./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.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_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/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_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/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_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/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 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 --- 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 14:34:31,488 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:34:31,491 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:34:31,532 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:34:31,533 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:34:31,534 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:34:31,536 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:34:31,538 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:34:31,540 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:34:31,541 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:34:31,542 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:34:31,544 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:34:31,544 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:34:31,545 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:34:31,546 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:34:31,548 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:34:31,549 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:34:31,550 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:34:31,552 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:34:31,554 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:34:31,556 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:34:31,557 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:34:31,559 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:34:31,560 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:34:31,564 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:34:31,565 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:34:31,565 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:34:31,566 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:34:31,567 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:34:31,568 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:34:31,569 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:34:31,570 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:34:31,571 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:34:31,572 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:34:31,573 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:34:31,574 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:34:31,575 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:34:31,575 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:34:31,576 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:34:31,577 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:34:31,578 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:34:31,579 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:34:31,601 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:34:31,601 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:34:31,602 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:34:31,602 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:34:31,603 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:34:31,603 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:34:31,604 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:34:31,604 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:34:31,604 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:34:31,605 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:34:31,605 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:34:31,605 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:34:31,606 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:34:31,606 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:34:31,606 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:34:31,607 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:34:31,607 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:34:31,607 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:34:31,608 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:34:31,608 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:34:31,609 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:34:31,609 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:34:31,609 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:34:31,610 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:34:31,610 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:34:31,610 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:34:31,611 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:34:31,611 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:34:31,611 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:34:31,612 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:34:31,612 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:34:31,612 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:34:31,613 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:34:31,613 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:34:31,613 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:34:31,614 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:34:31,614 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:34:31,614 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:34:31,615 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:34:31,615 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:34:31,615 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:34:31,616 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_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 [2022-11-23 14:34:31,899 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:34:31,927 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:34:31,930 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:34:31,931 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:34:31,932 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:34:31,933 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2022-11-23 14:34:35,102 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:34:35,347 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:34:35,348 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2022-11-23 14:34:35,356 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/data/c2689a7dd/61de7561be36459c8bc19d3f4645efbc/FLAGdb7877a4b [2022-11-23 14:34:35,370 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/data/c2689a7dd/61de7561be36459c8bc19d3f4645efbc [2022-11-23 14:34:35,373 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:34:35,375 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:34:35,376 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:34:35,376 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:34:35,380 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:34:35,381 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,382 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26f5a0f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35, skipping insertion in model container [2022-11-23 14:34:35,382 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,390 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:34:35,407 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:34:35,551 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_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2022-11-23 14:34:35,572 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:34:35,582 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:34:35,594 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_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2022-11-23 14:34:35,610 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:34:35,621 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:34:35,622 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35 WrapperNode [2022-11-23 14:34:35,622 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:34:35,623 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:34:35,623 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:34:35,624 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:34:35,632 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,639 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,658 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2022-11-23 14:34:35,659 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:34:35,660 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:34:35,660 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:34:35,660 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:34:35,669 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,670 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,671 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,671 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,675 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,679 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,680 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,681 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,683 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:34:35,684 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:34:35,685 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:34:35,685 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:34:35,695 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (1/1) ... [2022-11-23 14:34:35,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:34:35,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:34:35,727 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:34:35,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:34:35,778 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:34:35,779 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-23 14:34:35,780 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-23 14:34:35,780 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:34:35,780 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:34:35,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:34:35,781 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 14:34:35,781 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 14:34:35,853 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:34:35,856 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:34:36,025 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:34:36,079 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:34:36,080 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-23 14:34:36,082 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:34:36 BoogieIcfgContainer [2022-11-23 14:34:36,083 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:34:36,085 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:34:36,085 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:34:36,089 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:34:36,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:34:35" (1/3) ... [2022-11-23 14:34:36,090 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45b390b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:34:36, skipping insertion in model container [2022-11-23 14:34:36,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:35" (2/3) ... [2022-11-23 14:34:36,107 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45b390b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:34:36, skipping insertion in model container [2022-11-23 14:34:36,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:34:36" (3/3) ... [2022-11-23 14:34:36,108 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound5.c [2022-11-23 14:34:36,146 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:34:36,146 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:34:36,232 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:34:36,240 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;@53148b7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:34:36,240 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:34:36,245 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 14:34:36,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:34:36,254 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:34:36,255 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:34:36,255 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:34:36,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:34:36,262 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2022-11-23 14:34:36,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:34:36,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439080578] [2022-11-23 14:34:36,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:36,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:34:36,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:34:36,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:34:36,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439080578] [2022-11-23 14:34:36,487 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 14:34:36,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927803270] [2022-11-23 14:34:36,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:36,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:36,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:34:36,494 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:34:36,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:34:36,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:34:36,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-23 14:34:36,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:34:36,657 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:34:36,657 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:34:36,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927803270] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:34:36,659 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:34:36,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:34:36,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927851023] [2022-11-23 14:34:36,663 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:34:36,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-23 14:34:36,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:34:36,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-23 14:34:36,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:34:36,706 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-23 14:34:36,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:34:36,754 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2022-11-23 14:34:36,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-23 14:34:36,760 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2022-11-23 14:34:36,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:34:36,777 INFO L225 Difference]: With dead ends: 51 [2022-11-23 14:34:36,783 INFO L226 Difference]: Without dead ends: 28 [2022-11-23 14:34:36,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:34:36,791 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:34:36,795 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:34:36,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-23 14:34:36,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-23 14:34:36,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-23 14:34:36,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2022-11-23 14:34:36,880 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2022-11-23 14:34:36,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:34:36,882 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2022-11-23 14:34:36,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-23 14:34:36,882 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2022-11-23 14:34:36,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-23 14:34:36,884 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:34:36,884 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:34:36,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:34:37,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:37,092 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:34:37,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:34:37,093 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2022-11-23 14:34:37,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:34:37,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108125919] [2022-11-23 14:34:37,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:37,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:34:37,115 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:34:37,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1239923702] [2022-11-23 14:34:37,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:37,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:37,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:34:37,118 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:34:37,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:34:37,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:34:37,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-23 14:34:37,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:34:37,297 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 14:34:37,298 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:34:37,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:34:37,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108125919] [2022-11-23 14:34:37,298 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:34:37,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239923702] [2022-11-23 14:34:37,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239923702] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:34:37,299 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:34:37,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:34:37,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761939803] [2022-11-23 14:34:37,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:34:37,301 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:34:37,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:34:37,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:34:37,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:34:37,302 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-23 14:34:37,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:34:37,425 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-11-23 14:34:37,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:34:37,426 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2022-11-23 14:34:37,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:34:37,427 INFO L225 Difference]: With dead ends: 47 [2022-11-23 14:34:37,427 INFO L226 Difference]: Without dead ends: 40 [2022-11-23 14:34:37,428 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:34:37,429 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 30 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:34:37,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 78 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:34:37,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-23 14:34:37,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2022-11-23 14:34:37,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-23 14:34:37,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-11-23 14:34:37,456 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2022-11-23 14:34:37,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:34:37,457 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-11-23 14:34:37,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-23 14:34:37,457 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-11-23 14:34:37,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-23 14:34:37,458 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:34:37,459 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:34:37,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:34:37,665 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:37,665 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:34:37,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:34:37,666 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2022-11-23 14:34:37,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:34:37,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089462917] [2022-11-23 14:34:37,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:37,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:34:37,692 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:34:37,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1124535442] [2022-11-23 14:34:37,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:37,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:37,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:34:37,703 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:34:37,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:34:37,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:34:37,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-23 14:34:37,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:34:38,021 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 14:34:38,021 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:34:38,021 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:34:38,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089462917] [2022-11-23 14:34:38,022 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:34:38,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124535442] [2022-11-23 14:34:38,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124535442] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:34:38,022 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:34:38,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-23 14:34:38,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269889307] [2022-11-23 14:34:38,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:34:38,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:34:38,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:34:38,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:34:38,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:34:38,025 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-23 14:34:38,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:34:38,190 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-11-23 14:34:38,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:34:38,191 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2022-11-23 14:34:38,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:34:38,196 INFO L225 Difference]: With dead ends: 46 [2022-11-23 14:34:38,196 INFO L226 Difference]: Without dead ends: 44 [2022-11-23 14:34:38,197 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:34:38,198 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 31 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:34:38,199 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 114 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:34:38,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-23 14:34:38,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-23 14:34:38,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-23 14:34:38,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2022-11-23 14:34:38,226 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2022-11-23 14:34:38,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:34:38,227 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2022-11-23 14:34:38,227 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-23 14:34:38,228 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2022-11-23 14:34:38,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-23 14:34:38,229 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:34:38,229 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:34:38,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:34:38,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:38,439 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:34:38,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:34:38,440 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2022-11-23 14:34:38,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:34:38,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441539731] [2022-11-23 14:34:38,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:38,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:34:38,458 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:34:38,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1236084357] [2022-11-23 14:34:38,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:38,459 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:38,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:34:38,460 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:34:38,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:34:38,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:34:38,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-23 14:34:38,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:34:38,579 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 14:34:38,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:34:38,713 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 14:34:38,716 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:34:38,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441539731] [2022-11-23 14:34:38,717 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:34:38,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236084357] [2022-11-23 14:34:38,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236084357] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:34:38,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [616968755] [2022-11-23 14:34:38,751 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 14:34:38,758 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:34:38,763 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:34:38,773 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:34:38,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:34:39,791 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:34:39,819 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:34:41,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [616968755] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:34:41,889 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:34:41,890 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2022-11-23 14:34:41,890 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132067462] [2022-11-23 14:34:41,891 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:34:41,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-23 14:34:41,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:34:41,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-23 14:34:41,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-23 14:34:41,892 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 14:34:42,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:34:42,255 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2022-11-23 14:34:42,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 14:34:42,256 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2022-11-23 14:34:42,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:34:42,261 INFO L225 Difference]: With dead ends: 71 [2022-11-23 14:34:42,261 INFO L226 Difference]: Without dead ends: 64 [2022-11-23 14:34:42,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-23 14:34:42,268 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 57 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:34:42,269 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 58 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:34:42,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-23 14:34:42,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2022-11-23 14:34:42,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-23 14:34:42,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2022-11-23 14:34:42,300 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2022-11-23 14:34:42,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:34:42,300 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2022-11-23 14:34:42,300 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 14:34:42,300 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2022-11-23 14:34:42,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-23 14:34:42,301 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:34:42,301 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:34:42,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:34:42,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:42,508 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:34:42,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:34:42,510 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2022-11-23 14:34:42,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:34:42,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988534441] [2022-11-23 14:34:42,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:42,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:34:42,540 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:34:42,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1616660874] [2022-11-23 14:34:42,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:42,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:42,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:34:42,545 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:34:42,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:34:42,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:34:42,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-23 14:34:42,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:34:42,704 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:34:42,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:34:42,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:34:42,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988534441] [2022-11-23 14:34:42,796 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:34:42,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616660874] [2022-11-23 14:34:42,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616660874] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:34:42,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1828305536] [2022-11-23 14:34:42,800 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-23 14:34:42,800 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:34:42,801 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:34:42,802 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:34:42,802 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:34:43,260 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-23 14:34:43,272 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:34:43,292 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:34:44,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1828305536] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:34:44,667 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:34:44,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7] total 20 [2022-11-23 14:34:44,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311768252] [2022-11-23 14:34:44,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:34:44,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-23 14:34:44,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:34:44,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-23 14:34:44,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-23 14:34:44,670 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-23 14:34:45,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:34:45,128 INFO L93 Difference]: Finished difference Result 72 states and 97 transitions. [2022-11-23 14:34:45,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 14:34:45,129 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 29 [2022-11-23 14:34:45,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:34:45,130 INFO L225 Difference]: With dead ends: 72 [2022-11-23 14:34:45,130 INFO L226 Difference]: Without dead ends: 70 [2022-11-23 14:34:45,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-23 14:34:45,132 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 103 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:34:45,132 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 57 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:34:45,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-23 14:34:45,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 65. [2022-11-23 14:34:45,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 21 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-23 14:34:45,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2022-11-23 14:34:45,167 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 29 [2022-11-23 14:34:45,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:34:45,167 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2022-11-23 14:34:45,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-23 14:34:45,168 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2022-11-23 14:34:45,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-23 14:34:45,168 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:34:45,169 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:34:45,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:34:45,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:45,374 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:34:45,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:34:45,375 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2022-11-23 14:34:45,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:34:45,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041810183] [2022-11-23 14:34:45,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:45,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:34:45,387 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:34:45,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [989652855] [2022-11-23 14:34:45,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:45,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:45,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:34:45,389 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:34:45,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:34:45,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:34:45,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-23 14:34:45,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:34:45,589 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 14:34:45,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:34:45,775 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:34:45,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:34:45,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041810183] [2022-11-23 14:34:45,775 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:34:45,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989652855] [2022-11-23 14:34:45,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989652855] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:34:45,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [482047723] [2022-11-23 14:34:45,786 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-23 14:34:45,787 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:34:45,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:34:45,787 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:34:45,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:34:46,526 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-23 14:34:46,532 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:34:46,548 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:34:49,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [482047723] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:34:49,089 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:34:49,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [8, 6] total 26 [2022-11-23 14:34:49,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610827626] [2022-11-23 14:34:49,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:34:49,090 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 14:34:49,090 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:34:49,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 14:34:49,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-23 14:34:49,092 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 14:34:49,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:34:49,614 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2022-11-23 14:34:49,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 14:34:49,615 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2022-11-23 14:34:49,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:34:49,617 INFO L225 Difference]: With dead ends: 96 [2022-11-23 14:34:49,617 INFO L226 Difference]: Without dead ends: 94 [2022-11-23 14:34:49,617 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-23 14:34:49,618 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 86 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:34:49,618 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 56 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 14:34:49,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-23 14:34:49,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-11-23 14:34:49,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.196078431372549) internal successors, (61), 54 states have internal predecessors, (61), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-23 14:34:49,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2022-11-23 14:34:49,663 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 29 [2022-11-23 14:34:49,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:34:49,664 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2022-11-23 14:34:49,664 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 14:34:49,664 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2022-11-23 14:34:49,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-23 14:34:49,666 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:34:49,666 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:34:49,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 14:34:49,873 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:49,873 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:34:49,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:34:49,873 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2022-11-23 14:34:49,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:34:49,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460758778] [2022-11-23 14:34:49,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:49,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:34:49,886 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:34:49,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [698965144] [2022-11-23 14:34:49,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:34:49,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:34:49,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:34:49,888 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:34:49,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:34:49,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:34:49,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-23 14:34:49,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:34:50,855 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-23 14:34:50,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:34:52,672 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 14:34:52,675 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:34:52,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460758778] [2022-11-23 14:34:52,676 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:34:52,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698965144] [2022-11-23 14:34:52,676 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698965144] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:34:52,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1216983758] [2022-11-23 14:34:52,679 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:34:52,680 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:34:52,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:34:52,680 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:34:52,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:35:07,045 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:35:07,051 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:35:07,064 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:35:18,710 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2087#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:35:18,710 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:35:18,710 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:35:18,710 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 26 [2022-11-23 14:35:18,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95322750] [2022-11-23 14:35:18,711 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:35:18,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 14:35:18,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:35:18,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 14:35:18,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1853, Unknown=0, NotChecked=0, Total=2070 [2022-11-23 14:35:18,713 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-23 14:35:35,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:35:35,287 INFO L93 Difference]: Finished difference Result 218 states and 311 transitions. [2022-11-23 14:35:35,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-23 14:35:35,288 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) Word has length 51 [2022-11-23 14:35:35,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:35:35,291 INFO L225 Difference]: With dead ends: 218 [2022-11-23 14:35:35,292 INFO L226 Difference]: Without dead ends: 180 [2022-11-23 14:35:35,293 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 104 SyntacticMatches, 6 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1730 ImplicationChecksByTransitivity, 23.2s TimeCoverageRelationStatistics Valid=554, Invalid=4276, Unknown=0, NotChecked=0, Total=4830 [2022-11-23 14:35:35,294 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 151 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 1506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:35:35,295 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 196 Invalid, 1506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 6.4s Time] [2022-11-23 14:35:35,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-11-23 14:35:35,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 137. [2022-11-23 14:35:35,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 87 states have (on average 1.2413793103448276) internal successors, (108), 88 states have internal predecessors, (108), 41 states have call successors, (41), 8 states have call predecessors, (41), 8 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2022-11-23 14:35:35,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 189 transitions. [2022-11-23 14:35:35,388 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 189 transitions. Word has length 51 [2022-11-23 14:35:35,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:35:35,388 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 189 transitions. [2022-11-23 14:35:35,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-23 14:35:35,389 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 189 transitions. [2022-11-23 14:35:35,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-23 14:35:35,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:35:35,391 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:35:35,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:35:35,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:35:35,597 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:35:35,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:35:35,597 INFO L85 PathProgramCache]: Analyzing trace with hash -900294476, now seen corresponding path program 1 times [2022-11-23 14:35:35,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:35:35,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988282580] [2022-11-23 14:35:35,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:35:35,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:35:35,614 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:35:35,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [847999706] [2022-11-23 14:35:35,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:35:35,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:35:35,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:35:35,622 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:35:35,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:35:35,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:35:35,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:35:35,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:35:35,713 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-23 14:35:35,713 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:35:35,713 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:35:35,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988282580] [2022-11-23 14:35:35,714 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:35:35,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847999706] [2022-11-23 14:35:35,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847999706] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:35:35,714 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:35:35,714 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:35:35,714 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053875216] [2022-11-23 14:35:35,714 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:35:35,715 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:35:35,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:35:35,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:35:35,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:35:35,716 INFO L87 Difference]: Start difference. First operand 137 states and 189 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-23 14:35:35,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:35:35,880 INFO L93 Difference]: Finished difference Result 229 states and 321 transitions. [2022-11-23 14:35:35,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:35:35,881 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2022-11-23 14:35:35,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:35:35,883 INFO L225 Difference]: With dead ends: 229 [2022-11-23 14:35:35,883 INFO L226 Difference]: Without dead ends: 166 [2022-11-23 14:35:35,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:35:35,884 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 4 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:35:35,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 84 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:35:35,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-11-23 14:35:35,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 155. [2022-11-23 14:35:35,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 93 states have (on average 1.2365591397849462) internal successors, (115), 94 states have internal predecessors, (115), 53 states have call successors, (53), 8 states have call predecessors, (53), 8 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-23 14:35:35,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 220 transitions. [2022-11-23 14:35:35,997 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 220 transitions. Word has length 54 [2022-11-23 14:35:35,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:35:35,997 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 220 transitions. [2022-11-23 14:35:35,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-23 14:35:35,998 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 220 transitions. [2022-11-23 14:35:35,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 14:35:35,999 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:35:35,999 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:35:36,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 14:35:36,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:35:36,207 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:35:36,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:35:36,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2022-11-23 14:35:36,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:35:36,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152161892] [2022-11-23 14:35:36,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:35:36,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:35:36,219 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:35:36,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [592238804] [2022-11-23 14:35:36,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:35:36,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:35:36,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:35:36,221 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:35:36,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:35:36,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:35:36,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-23 14:35:36,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:35:36,446 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 25 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-23 14:35:36,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:35:36,564 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-23 14:35:36,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:35:36,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152161892] [2022-11-23 14:35:36,565 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:35:36,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592238804] [2022-11-23 14:35:36,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592238804] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:35:36,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37070200] [2022-11-23 14:35:36,567 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-23 14:35:36,568 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:35:36,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:35:36,568 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:35:36,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:35:43,137 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:35:43,141 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:35:43,155 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:35:45,191 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3853#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:35:45,191 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:35:45,192 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:35:45,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 14 [2022-11-23 14:35:45,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229044657] [2022-11-23 14:35:45,192 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:35:45,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 14:35:45,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:35:45,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 14:35:45,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2022-11-23 14:35:45,193 INFO L87 Difference]: Start difference. First operand 155 states and 220 transitions. Second operand has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-23 14:35:45,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:35:45,814 INFO L93 Difference]: Finished difference Result 198 states and 272 transitions. [2022-11-23 14:35:45,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 14:35:45,815 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) Word has length 61 [2022-11-23 14:35:45,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:35:45,821 INFO L225 Difference]: With dead ends: 198 [2022-11-23 14:35:45,821 INFO L226 Difference]: Without dead ends: 196 [2022-11-23 14:35:45,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 148 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=180, Invalid=1152, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 14:35:45,826 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 65 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:35:45,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 111 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:35:45,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-23 14:35:46,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 167. [2022-11-23 14:35:46,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 103 states have internal predecessors, (124), 53 states have call successors, (53), 11 states have call predecessors, (53), 11 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-23 14:35:46,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 229 transitions. [2022-11-23 14:35:46,009 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 229 transitions. Word has length 61 [2022-11-23 14:35:46,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:35:46,010 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 229 transitions. [2022-11-23 14:35:46,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-23 14:35:46,011 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 229 transitions. [2022-11-23 14:35:46,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-23 14:35:46,014 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:35:46,014 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:35:46,018 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-23 14:35:46,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-23 14:35:46,215 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:35:46,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:35:46,215 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 2 times [2022-11-23 14:35:46,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:35:46,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459508116] [2022-11-23 14:35:46,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:35:46,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:35:46,229 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:35:46,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [26701602] [2022-11-23 14:35:46,230 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:35:46,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:35:46,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:35:46,231 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:35:46,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 14:35:46,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:35:46,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:35:46,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 55 conjunts are in the unsatisfiable core [2022-11-23 14:35:46,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:35:46,943 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-23 14:35:46,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:35:47,456 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 14:35:47,456 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:35:47,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459508116] [2022-11-23 14:35:47,457 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:35:47,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26701602] [2022-11-23 14:35:47,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26701602] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:35:47,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [427444961] [2022-11-23 14:35:47,459 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:35:47,460 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:35:47,460 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:35:47,460 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:35:47,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:35:53,639 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-23 14:35:53,694 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:35:53,709 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:35:58,776 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4824#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:35:58,776 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:35:58,776 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:35:58,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-23 14:35:58,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37124236] [2022-11-23 14:35:58,776 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:35:58,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 14:35:58,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:35:58,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 14:35:58,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1749, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 14:35:58,778 INFO L87 Difference]: Start difference. First operand 167 states and 229 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-23 14:36:21,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:36:21,021 INFO L93 Difference]: Finished difference Result 446 states and 634 transitions. [2022-11-23 14:36:21,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-23 14:36:21,022 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 59 [2022-11-23 14:36:21,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:36:21,028 INFO L225 Difference]: With dead ends: 446 [2022-11-23 14:36:21,028 INFO L226 Difference]: Without dead ends: 375 [2022-11-23 14:36:21,034 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 126 SyntacticMatches, 6 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2117 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=776, Invalid=5076, Unknown=0, NotChecked=0, Total=5852 [2022-11-23 14:36:21,035 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 271 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 1136 mSolverCounterSat, 320 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 1456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 320 IncrementalHoareTripleChecker+Valid, 1136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:36:21,036 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [271 Valid, 372 Invalid, 1456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [320 Valid, 1136 Invalid, 0 Unknown, 0 Unchecked, 10.1s Time] [2022-11-23 14:36:21,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2022-11-23 14:36:21,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 244. [2022-11-23 14:36:21,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 153 states have (on average 1.2287581699346406) internal successors, (188), 154 states have internal predecessors, (188), 77 states have call successors, (77), 13 states have call predecessors, (77), 13 states have return successors, (76), 76 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-23 14:36:21,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 341 transitions. [2022-11-23 14:36:21,200 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 341 transitions. Word has length 59 [2022-11-23 14:36:21,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:36:21,200 INFO L495 AbstractCegarLoop]: Abstraction has 244 states and 341 transitions. [2022-11-23 14:36:21,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-23 14:36:21,201 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 341 transitions. [2022-11-23 14:36:21,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-23 14:36:21,202 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:36:21,202 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:36:21,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 14:36:21,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 14:36:21,409 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:36:21,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:36:21,409 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 3 times [2022-11-23 14:36:21,410 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:36:21,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800824424] [2022-11-23 14:36:21,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:36:21,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:36:21,421 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:36:21,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [424571958] [2022-11-23 14:36:21,421 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:36:21,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:36:21,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:36:21,423 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:36:21,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 14:36:21,483 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:36:21,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:36:21,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-23 14:36:21,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:36:21,549 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 14:36:21,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:36:21,633 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 14:36:21,633 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:36:21,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800824424] [2022-11-23 14:36:21,633 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:36:21,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424571958] [2022-11-23 14:36:21,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424571958] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:36:21,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1591387367] [2022-11-23 14:36:21,636 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:36:21,636 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:36:21,636 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:36:21,637 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:36:21,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:36:31,302 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:36:31,306 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:36:31,320 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:36:33,541 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6343#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:36:33,541 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:36:33,542 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:36:33,542 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-11-23 14:36:33,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722529769] [2022-11-23 14:36:33,542 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:36:33,543 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-23 14:36:33,543 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:36:33,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-23 14:36:33,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:36:33,544 INFO L87 Difference]: Start difference. First operand 244 states and 341 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-23 14:36:34,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:36:34,176 INFO L93 Difference]: Finished difference Result 353 states and 497 transitions. [2022-11-23 14:36:34,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 14:36:34,177 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2022-11-23 14:36:34,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:36:34,178 INFO L225 Difference]: With dead ends: 353 [2022-11-23 14:36:34,179 INFO L226 Difference]: Without dead ends: 255 [2022-11-23 14:36:34,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=244, Invalid=1562, Unknown=0, NotChecked=0, Total=1806 [2022-11-23 14:36:34,180 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 46 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:36:34,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 221 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 346 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:36:34,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2022-11-23 14:36:34,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 225. [2022-11-23 14:36:34,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 138 states have (on average 1.1956521739130435) internal successors, (165), 139 states have internal predecessors, (165), 73 states have call successors, (73), 13 states have call predecessors, (73), 13 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2022-11-23 14:36:34,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 310 transitions. [2022-11-23 14:36:34,334 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 310 transitions. Word has length 59 [2022-11-23 14:36:34,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:36:34,334 INFO L495 AbstractCegarLoop]: Abstraction has 225 states and 310 transitions. [2022-11-23 14:36:34,334 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-23 14:36:34,334 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 310 transitions. [2022-11-23 14:36:34,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-23 14:36:34,335 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:36:34,336 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:36:34,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 14:36:34,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:36:34,541 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:36:34,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:36:34,541 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2022-11-23 14:36:34,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:36:34,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675094956] [2022-11-23 14:36:34,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:36:34,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:36:34,552 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:36:34,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1922526232] [2022-11-23 14:36:34,552 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:36:34,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:36:34,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:36:34,554 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:36:34,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 14:36:34,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:36:34,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-23 14:36:34,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:36:34,756 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2022-11-23 14:36:34,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:36:34,839 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-23 14:36:34,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:36:34,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675094956] [2022-11-23 14:36:34,839 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:36:34,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922526232] [2022-11-23 14:36:34,839 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922526232] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 14:36:34,839 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:36:34,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2022-11-23 14:36:34,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499430960] [2022-11-23 14:36:34,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:36:34,840 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:36:34,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:36:34,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:36:34,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-23 14:36:34,841 INFO L87 Difference]: Start difference. First operand 225 states and 310 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-23 14:36:35,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:36:35,080 INFO L93 Difference]: Finished difference Result 261 states and 358 transitions. [2022-11-23 14:36:35,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:36:35,081 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2022-11-23 14:36:35,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:36:35,082 INFO L225 Difference]: With dead ends: 261 [2022-11-23 14:36:35,083 INFO L226 Difference]: Without dead ends: 259 [2022-11-23 14:36:35,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-23 14:36:35,084 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:36:35,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 105 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:36:35,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-23 14:36:35,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 255. [2022-11-23 14:36:35,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 153 states have (on average 1.196078431372549) internal successors, (183), 154 states have internal predecessors, (183), 85 states have call successors, (85), 16 states have call predecessors, (85), 16 states have return successors, (84), 84 states have call predecessors, (84), 84 states have call successors, (84) [2022-11-23 14:36:35,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 352 transitions. [2022-11-23 14:36:35,242 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 352 transitions. Word has length 64 [2022-11-23 14:36:35,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:36:35,242 INFO L495 AbstractCegarLoop]: Abstraction has 255 states and 352 transitions. [2022-11-23 14:36:35,243 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-23 14:36:35,243 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 352 transitions. [2022-11-23 14:36:35,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-23 14:36:35,244 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:36:35,244 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:36:35,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 14:36:35,450 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:36:35,451 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:36:35,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:36:35,451 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2022-11-23 14:36:35,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:36:35,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491046065] [2022-11-23 14:36:35,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:36:35,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:36:35,470 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:36:35,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1238692273] [2022-11-23 14:36:35,476 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:36:35,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:36:35,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:36:35,477 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:36:35,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 14:36:35,555 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:36:35,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:36:35,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-23 14:36:35,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:36:36,336 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 13 proven. 22 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-23 14:36:36,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:36:37,679 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-23 14:36:37,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:36:37,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491046065] [2022-11-23 14:36:37,680 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:36:37,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238692273] [2022-11-23 14:36:37,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238692273] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:36:37,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026564146] [2022-11-23 14:36:37,682 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:36:37,683 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:36:37,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:36:37,683 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:36:37,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:36:48,971 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:36:48,974 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:36:48,988 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:36:55,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8892#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:36:55,412 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:36:55,412 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:36:55,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-23 14:36:55,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613652112] [2022-11-23 14:36:55,413 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:36:55,413 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 14:36:55,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:36:55,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 14:36:55,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1768, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 14:36:55,415 INFO L87 Difference]: Start difference. First operand 255 states and 352 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-23 14:37:19,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:37:19,849 INFO L93 Difference]: Finished difference Result 395 states and 560 transitions. [2022-11-23 14:37:19,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-23 14:37:19,851 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 64 [2022-11-23 14:37:19,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:37:19,853 INFO L225 Difference]: With dead ends: 395 [2022-11-23 14:37:19,854 INFO L226 Difference]: Without dead ends: 393 [2022-11-23 14:37:19,855 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1489 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=654, Invalid=4316, Unknown=0, NotChecked=0, Total=4970 [2022-11-23 14:37:19,856 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 233 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 1186 mSolverCounterSat, 376 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 1562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 376 IncrementalHoareTripleChecker+Valid, 1186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:37:19,856 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 376 Invalid, 1562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [376 Valid, 1186 Invalid, 0 Unknown, 0 Unchecked, 11.0s Time] [2022-11-23 14:37:19,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2022-11-23 14:37:20,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 342. [2022-11-23 14:37:20,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 202 states have (on average 1.2128712871287128) internal successors, (245), 203 states have internal predecessors, (245), 121 states have call successors, (121), 18 states have call predecessors, (121), 18 states have return successors, (120), 120 states have call predecessors, (120), 120 states have call successors, (120) [2022-11-23 14:37:20,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 486 transitions. [2022-11-23 14:37:20,113 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 486 transitions. Word has length 64 [2022-11-23 14:37:20,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:37:20,113 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 486 transitions. [2022-11-23 14:37:20,113 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-23 14:37:20,113 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 486 transitions. [2022-11-23 14:37:20,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-23 14:37:20,114 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:37:20,114 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:37:20,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 14:37:20,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-23 14:37:20,319 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:37:20,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:37:20,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2022-11-23 14:37:20,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:37:20,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227059041] [2022-11-23 14:37:20,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:20,322 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:37:20,347 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:37:20,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [522703741] [2022-11-23 14:37:20,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:20,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:20,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:37:20,369 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:37:20,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 14:37:20,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:20,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-23 14:37:20,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:37:21,522 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 32 proven. 27 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-23 14:37:21,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:37:29,381 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 30 proven. 26 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2022-11-23 14:37:29,381 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:37:29,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227059041] [2022-11-23 14:37:29,381 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:37:29,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522703741] [2022-11-23 14:37:29,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522703741] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:37:29,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [849861398] [2022-11-23 14:37:29,384 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:37:29,384 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:37:29,384 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:37:29,385 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:37:29,385 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:37:35,930 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-23 14:37:35,975 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:37:35,988 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:37:47,106 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10621#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:37:47,106 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:37:47,107 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:37:47,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2022-11-23 14:37:47,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565277869] [2022-11-23 14:37:47,107 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:37:47,108 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 14:37:47,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:37:47,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 14:37:47,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=2108, Unknown=0, NotChecked=0, Total=2352 [2022-11-23 14:37:47,109 INFO L87 Difference]: Start difference. First operand 342 states and 486 transitions. Second operand has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2022-11-23 14:37:50,020 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:37:58,809 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:38:01,467 WARN L539 Checker$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 14:38:09,467 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:38:14,042 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:38:16,887 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:38:27,643 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:38:29,645 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:38:43,164 WARN L539 Checker$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 14:38:53,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:38:53,136 INFO L93 Difference]: Finished difference Result 534 states and 772 transitions. [2022-11-23 14:38:53,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-23 14:38:53,137 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) Word has length 78 [2022-11-23 14:38:53,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:38:53,140 INFO L225 Difference]: With dead ends: 534 [2022-11-23 14:38:53,140 INFO L226 Difference]: Without dead ends: 530 [2022-11-23 14:38:53,144 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 168 SyntacticMatches, 17 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4573 ImplicationChecksByTransitivity, 45.1s TimeCoverageRelationStatistics Valid=1757, Invalid=10233, Unknown=0, NotChecked=0, Total=11990 [2022-11-23 14:38:53,144 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 345 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 2307 mSolverCounterSat, 687 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 3001 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 687 IncrementalHoareTripleChecker+Valid, 2307 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 34.7s IncrementalHoareTripleChecker+Time [2022-11-23 14:38:53,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [345 Valid, 350 Invalid, 3001 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [687 Valid, 2307 Invalid, 7 Unknown, 0 Unchecked, 34.7s Time] [2022-11-23 14:38:53,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 530 states. [2022-11-23 14:38:53,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 530 to 490. [2022-11-23 14:38:53,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 290 states have (on average 1.2241379310344827) internal successors, (355), 291 states have internal predecessors, (355), 177 states have call successors, (177), 22 states have call predecessors, (177), 22 states have return successors, (176), 176 states have call predecessors, (176), 176 states have call successors, (176) [2022-11-23 14:38:53,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 708 transitions. [2022-11-23 14:38:53,692 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 708 transitions. Word has length 78 [2022-11-23 14:38:53,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:38:53,692 INFO L495 AbstractCegarLoop]: Abstraction has 490 states and 708 transitions. [2022-11-23 14:38:53,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2022-11-23 14:38:53,693 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 708 transitions. [2022-11-23 14:38:53,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-23 14:38:53,694 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:38:53,694 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:38:53,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 14:38:53,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-23 14:38:53,895 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:38:53,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:38:53,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2022-11-23 14:38:53,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:38:53,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929317368] [2022-11-23 14:38:53,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:38:53,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:38:53,906 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:38:53,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [872797053] [2022-11-23 14:38:53,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:38:53,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:38:53,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:38:53,908 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:38:53,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 14:38:53,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:38:53,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-23 14:38:53,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:38:54,349 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 21 proven. 19 refuted. 0 times theorem prover too weak. 188 trivial. 0 not checked. [2022-11-23 14:38:54,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:38:55,063 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2022-11-23 14:38:55,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:38:55,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929317368] [2022-11-23 14:38:55,063 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:38:55,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872797053] [2022-11-23 14:38:55,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872797053] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:38:55,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1481804534] [2022-11-23 14:38:55,066 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-23 14:38:55,066 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:38:55,066 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:38:55,067 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:38:55,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:38:57,732 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-11-23 14:38:57,769 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:38:57,784 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:39:00,625 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12892#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:39:00,625 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:39:00,625 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:39:00,625 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 22 [2022-11-23 14:39:00,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731968884] [2022-11-23 14:39:00,626 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:39:00,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 14:39:00,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:39:00,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 14:39:00,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1302, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 14:39:00,627 INFO L87 Difference]: Start difference. First operand 490 states and 708 transitions. Second operand has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 19 states have internal predecessors, (39), 9 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2022-11-23 14:39:05,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:39:05,669 INFO L93 Difference]: Finished difference Result 862 states and 1335 transitions. [2022-11-23 14:39:05,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-23 14:39:05,670 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 19 states have internal predecessors, (39), 9 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) Word has length 81 [2022-11-23 14:39:05,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:39:05,674 INFO L225 Difference]: With dead ends: 862 [2022-11-23 14:39:05,674 INFO L226 Difference]: Without dead ends: 860 [2022-11-23 14:39:05,676 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 195 SyntacticMatches, 11 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1821 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=735, Invalid=3957, Unknown=0, NotChecked=0, Total=4692 [2022-11-23 14:39:05,677 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 171 mSDsluCounter, 460 mSDsCounter, 0 mSdLazyCounter, 877 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 1119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 877 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:39:05,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 551 Invalid, 1119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 877 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-23 14:39:05,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 860 states. [2022-11-23 14:39:06,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 860 to 825. [2022-11-23 14:39:06,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 825 states, 427 states have (on average 1.2927400468384076) internal successors, (552), 428 states have internal predecessors, (552), 373 states have call successors, (373), 24 states have call predecessors, (373), 24 states have return successors, (372), 372 states have call predecessors, (372), 372 states have call successors, (372) [2022-11-23 14:39:06,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 825 states to 825 states and 1297 transitions. [2022-11-23 14:39:06,933 INFO L78 Accepts]: Start accepts. Automaton has 825 states and 1297 transitions. Word has length 81 [2022-11-23 14:39:06,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:39:06,934 INFO L495 AbstractCegarLoop]: Abstraction has 825 states and 1297 transitions. [2022-11-23 14:39:06,934 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 19 states have internal predecessors, (39), 9 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2022-11-23 14:39:06,934 INFO L276 IsEmpty]: Start isEmpty. Operand 825 states and 1297 transitions. [2022-11-23 14:39:06,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-23 14:39:06,936 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:39:06,936 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:39:06,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 14:39:07,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:39:07,142 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:39:07,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:39:07,143 INFO L85 PathProgramCache]: Analyzing trace with hash 144664241, now seen corresponding path program 1 times [2022-11-23 14:39:07,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:39:07,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181691691] [2022-11-23 14:39:07,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:39:07,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:39:07,159 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:39:07,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [229925714] [2022-11-23 14:39:07,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:39:07,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:39:07,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:39:07,172 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:39:07,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 14:39:07,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:39:07,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-23 14:39:07,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:39:08,168 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 19 proven. 23 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2022-11-23 14:39:08,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:39:09,827 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-11-23 14:39:09,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:39:09,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181691691] [2022-11-23 14:39:09,828 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:39:09,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [229925714] [2022-11-23 14:39:09,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [229925714] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:39:09,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1009806575] [2022-11-23 14:39:09,830 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:39:09,830 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:39:09,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:39:09,831 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:39:09,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:39:16,478 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-23 14:39:16,529 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:39:16,545 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:39:24,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16264#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:39:24,613 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:39:24,613 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:39:24,613 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12] total 25 [2022-11-23 14:39:24,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675219939] [2022-11-23 14:39:24,614 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:39:24,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 14:39:24,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:39:24,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 14:39:24,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1447, Unknown=0, NotChecked=0, Total=1640 [2022-11-23 14:39:24,616 INFO L87 Difference]: Start difference. First operand 825 states and 1297 transitions. Second operand has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 22 states have internal predecessors, (49), 9 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2022-11-23 14:39:40,665 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.76s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:39:42,713 WARN L539 Checker$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 14:39:55,981 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:40:14,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:40:14,593 INFO L93 Difference]: Finished difference Result 1132 states and 1774 transitions. [2022-11-23 14:40:14,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-23 14:40:14,594 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 22 states have internal predecessors, (49), 9 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) Word has length 81 [2022-11-23 14:40:14,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:40:14,600 INFO L225 Difference]: With dead ends: 1132 [2022-11-23 14:40:14,600 INFO L226 Difference]: Without dead ends: 1130 [2022-11-23 14:40:14,602 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 186 SyntacticMatches, 16 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2203 ImplicationChecksByTransitivity, 34.0s TimeCoverageRelationStatistics Valid=912, Invalid=4638, Unknown=0, NotChecked=0, Total=5550 [2022-11-23 14:40:14,603 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 221 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 1392 mSolverCounterSat, 278 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 1672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 1392 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:40:14,603 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 384 Invalid, 1672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 1392 Invalid, 2 Unknown, 0 Unchecked, 23.2s Time] [2022-11-23 14:40:14,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1130 states. [2022-11-23 14:40:16,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1130 to 1101. [2022-11-23 14:40:16,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1101 states, 571 states have (on average 1.299474605954466) internal successors, (742), 572 states have internal predecessors, (742), 501 states have call successors, (501), 28 states have call predecessors, (501), 28 states have return successors, (500), 500 states have call predecessors, (500), 500 states have call successors, (500) [2022-11-23 14:40:16,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1101 states to 1101 states and 1743 transitions. [2022-11-23 14:40:16,669 INFO L78 Accepts]: Start accepts. Automaton has 1101 states and 1743 transitions. Word has length 81 [2022-11-23 14:40:16,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:40:16,669 INFO L495 AbstractCegarLoop]: Abstraction has 1101 states and 1743 transitions. [2022-11-23 14:40:16,670 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 22 states have internal predecessors, (49), 9 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2022-11-23 14:40:16,670 INFO L276 IsEmpty]: Start isEmpty. Operand 1101 states and 1743 transitions. [2022-11-23 14:40:16,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-23 14:40:16,671 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:40:16,671 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:40:16,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 14:40:16,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 14:40:16,878 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:40:16,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:40:16,878 INFO L85 PathProgramCache]: Analyzing trace with hash 646028470, now seen corresponding path program 6 times [2022-11-23 14:40:16,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:40:16,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561127941] [2022-11-23 14:40:16,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:40:16,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:40:16,888 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:40:16,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1271689566] [2022-11-23 14:40:16,888 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:40:16,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:40:16,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:40:16,890 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:40:16,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 14:40:16,956 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:40:16,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:40:16,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-23 14:40:16,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:40:19,153 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 34 proven. 44 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-23 14:40:19,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:40:19,951 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-23 14:40:19,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:40:19,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561127941] [2022-11-23 14:40:19,952 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:40:19,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271689566] [2022-11-23 14:40:19,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1271689566] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:40:19,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1281039948] [2022-11-23 14:40:19,954 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:40:19,954 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:40:19,954 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:40:19,954 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:40:19,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:40:27,355 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:40:27,359 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:40:27,373 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:40:31,168 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20581#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:40:31,168 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:40:31,168 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:40:31,168 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 8] total 24 [2022-11-23 14:40:31,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218451124] [2022-11-23 14:40:31,168 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:40:31,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-23 14:40:31,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:40:31,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-23 14:40:31,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1624, Unknown=0, NotChecked=0, Total=1806 [2022-11-23 14:40:31,170 INFO L87 Difference]: Start difference. First operand 1101 states and 1743 transitions. Second operand has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-23 14:40:49,672 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:41:06,823 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:41:17,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:41:17,092 INFO L93 Difference]: Finished difference Result 1216 states and 1904 transitions. [2022-11-23 14:41:17,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 14:41:17,093 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) Word has length 84 [2022-11-23 14:41:17,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:41:17,099 INFO L225 Difference]: With dead ends: 1216 [2022-11-23 14:41:17,100 INFO L226 Difference]: Without dead ends: 1214 [2022-11-23 14:41:17,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 206 SyntacticMatches, 9 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1440 ImplicationChecksByTransitivity, 26.3s TimeCoverageRelationStatistics Valid=362, Invalid=3178, Unknown=0, NotChecked=0, Total=3540 [2022-11-23 14:41:17,102 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 117 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 998 mSolverCounterSat, 144 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 1143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 998 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:41:17,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 296 Invalid, 1143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 998 Invalid, 1 Unknown, 0 Unchecked, 23.1s Time] [2022-11-23 14:41:17,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1214 states. [2022-11-23 14:41:19,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1214 to 1125. [2022-11-23 14:41:19,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1125 states, 589 states have (on average 1.2903225806451613) internal successors, (760), 590 states have internal predecessors, (760), 501 states have call successors, (501), 34 states have call predecessors, (501), 34 states have return successors, (500), 500 states have call predecessors, (500), 500 states have call successors, (500) [2022-11-23 14:41:19,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1125 states to 1125 states and 1761 transitions. [2022-11-23 14:41:19,209 INFO L78 Accepts]: Start accepts. Automaton has 1125 states and 1761 transitions. Word has length 84 [2022-11-23 14:41:19,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:41:19,209 INFO L495 AbstractCegarLoop]: Abstraction has 1125 states and 1761 transitions. [2022-11-23 14:41:19,209 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-23 14:41:19,209 INFO L276 IsEmpty]: Start isEmpty. Operand 1125 states and 1761 transitions. [2022-11-23 14:41:19,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-23 14:41:19,211 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:41:19,212 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:41:19,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-23 14:41:19,417 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 14:41:19,418 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:41:19,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:41:19,418 INFO L85 PathProgramCache]: Analyzing trace with hash 355863159, now seen corresponding path program 2 times [2022-11-23 14:41:19,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:41:19,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555149511] [2022-11-23 14:41:19,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:41:19,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:41:19,425 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:41:19,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [814238574] [2022-11-23 14:41:19,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:41:19,426 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:41:19,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:41:19,427 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:41:19,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 14:41:19,504 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-23 14:41:19,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:41:19,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-23 14:41:19,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:41:21,045 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 26 proven. 29 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2022-11-23 14:41:21,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:41:22,774 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 24 proven. 30 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-23 14:41:22,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:41:22,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555149511] [2022-11-23 14:41:22,774 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:41:22,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814238574] [2022-11-23 14:41:22,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814238574] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:41:22,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1895562465] [2022-11-23 14:41:22,777 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:41:22,777 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:41:22,777 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:41:22,777 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:41:22,778 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:41:29,272 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:41:29,276 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:41:29,291 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:41:35,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25142#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:41:35,969 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:41:35,970 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:41:35,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 35 [2022-11-23 14:41:35,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427483715] [2022-11-23 14:41:35,970 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:41:35,970 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-23 14:41:35,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:41:35,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-23 14:41:35,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 14:41:35,972 INFO L87 Difference]: Start difference. First operand 1125 states and 1761 transitions. Second operand has 35 states, 32 states have (on average 1.65625) internal successors, (53), 31 states have internal predecessors, (53), 11 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 9 states have call successors, (32) [2022-11-23 14:41:46,395 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 14:42:15,611 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:42:25,404 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:42:45,967 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:43:17,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:43:17,534 INFO L93 Difference]: Finished difference Result 1847 states and 2961 transitions. [2022-11-23 14:43:17,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-11-23 14:43:17,534 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.65625) internal successors, (53), 31 states have internal predecessors, (53), 11 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 9 states have call successors, (32) Word has length 98 [2022-11-23 14:43:17,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:43:17,542 INFO L225 Difference]: With dead ends: 1847 [2022-11-23 14:43:17,542 INFO L226 Difference]: Without dead ends: 1839 [2022-11-23 14:43:17,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 220 SyntacticMatches, 22 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8314 ImplicationChecksByTransitivity, 59.6s TimeCoverageRelationStatistics Valid=2704, Invalid=18466, Unknown=0, NotChecked=0, Total=21170 [2022-11-23 14:43:17,546 INFO L413 NwaCegarLoop]: 148 mSDtfsCounter, 414 mSDsluCounter, 961 mSDsCounter, 0 mSdLazyCounter, 3582 mSolverCounterSat, 739 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 46.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 427 SdHoareTripleChecker+Valid, 1109 SdHoareTripleChecker+Invalid, 4323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 739 IncrementalHoareTripleChecker+Valid, 3582 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 46.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:43:17,546 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [427 Valid, 1109 Invalid, 4323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [739 Valid, 3582 Invalid, 2 Unknown, 0 Unchecked, 46.5s Time] [2022-11-23 14:43:17,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1839 states. [2022-11-23 14:43:19,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1839 to 1264. [2022-11-23 14:43:19,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1264 states, 655 states have (on average 1.2931297709923664) internal successors, (847), 656 states have internal predecessors, (847), 573 states have call successors, (573), 35 states have call predecessors, (573), 35 states have return successors, (572), 572 states have call predecessors, (572), 572 states have call successors, (572) [2022-11-23 14:43:19,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1264 states to 1264 states and 1992 transitions. [2022-11-23 14:43:19,769 INFO L78 Accepts]: Start accepts. Automaton has 1264 states and 1992 transitions. Word has length 98 [2022-11-23 14:43:19,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:43:19,770 INFO L495 AbstractCegarLoop]: Abstraction has 1264 states and 1992 transitions. [2022-11-23 14:43:19,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 1.65625) internal successors, (53), 31 states have internal predecessors, (53), 11 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 9 states have call successors, (32) [2022-11-23 14:43:19,770 INFO L276 IsEmpty]: Start isEmpty. Operand 1264 states and 1992 transitions. [2022-11-23 14:43:19,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-23 14:43:19,773 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:43:19,773 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:43:19,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 14:43:19,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-23 14:43:19,979 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:43:19,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:43:19,979 INFO L85 PathProgramCache]: Analyzing trace with hash 1547138168, now seen corresponding path program 2 times [2022-11-23 14:43:19,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:43:19,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473398976] [2022-11-23 14:43:19,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:43:19,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:43:19,989 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:43:19,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1812215323] [2022-11-23 14:43:19,990 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:43:19,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:19,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:43:19,991 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:43:19,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 14:43:20,069 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 14:43:20,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:43:20,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-23 14:43:20,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:43:21,657 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 70 proven. 35 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2022-11-23 14:43:21,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:43:22,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:43:22,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473398976] [2022-11-23 14:43:22,799 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:43:22,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812215323] [2022-11-23 14:43:22,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812215323] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:43:22,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1958947612] [2022-11-23 14:43:22,801 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:43:22,801 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:43:22,802 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:43:22,802 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:43:22,802 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:43:29,186 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-23 14:43:29,228 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:43:29,242 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:43:37,355 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30956#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:43:37,355 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:43:37,355 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:43:37,355 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-11-23 14:43:37,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626282588] [2022-11-23 14:43:37,356 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-23 14:43:37,356 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 14:43:37,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:43:37,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 14:43:37,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1389, Unknown=0, NotChecked=0, Total=1560 [2022-11-23 14:43:37,357 INFO L87 Difference]: Start difference. First operand 1264 states and 1992 transitions. Second operand has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-23 14:43:41,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:43:41,638 INFO L93 Difference]: Finished difference Result 1418 states and 2227 transitions. [2022-11-23 14:43:41,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 14:43:41,639 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 108 [2022-11-23 14:43:41,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:43:41,645 INFO L225 Difference]: With dead ends: 1418 [2022-11-23 14:43:41,645 INFO L226 Difference]: Without dead ends: 1416 [2022-11-23 14:43:41,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 175 SyntacticMatches, 22 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1441 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=249, Invalid=2007, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 14:43:41,647 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 87 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 1132 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 1200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 1132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:43:41,647 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 240 Invalid, 1200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 1132 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-23 14:43:41,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1416 states. [2022-11-23 14:43:44,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1416 to 1396. [2022-11-23 14:43:44,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1396 states, 719 states have (on average 1.2962447844228095) internal successors, (932), 720 states have internal predecessors, (932), 637 states have call successors, (637), 39 states have call predecessors, (637), 39 states have return successors, (636), 636 states have call predecessors, (636), 636 states have call successors, (636) [2022-11-23 14:43:44,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1396 states to 1396 states and 2205 transitions. [2022-11-23 14:43:44,062 INFO L78 Accepts]: Start accepts. Automaton has 1396 states and 2205 transitions. Word has length 108 [2022-11-23 14:43:44,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:43:44,063 INFO L495 AbstractCegarLoop]: Abstraction has 1396 states and 2205 transitions. [2022-11-23 14:43:44,063 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-23 14:43:44,063 INFO L276 IsEmpty]: Start isEmpty. Operand 1396 states and 2205 transitions. [2022-11-23 14:43:44,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-23 14:43:44,066 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:43:44,066 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:43:44,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 14:43:44,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:44,272 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:43:44,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:43:44,272 INFO L85 PathProgramCache]: Analyzing trace with hash -1168736987, now seen corresponding path program 3 times [2022-11-23 14:43:44,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:43:44,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821185282] [2022-11-23 14:43:44,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:43:44,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:43:44,282 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:43:44,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2132982268] [2022-11-23 14:43:44,282 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:43:44,282 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:43:44,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:43:44,284 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:43:44,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 14:43:44,357 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:43:44,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:43:44,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 14:43:44,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:43:44,596 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 96 proven. 34 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2022-11-23 14:43:44,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:43:44,895 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 48 proven. 36 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2022-11-23 14:43:44,896 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:43:44,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821185282] [2022-11-23 14:43:44,896 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:43:44,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132982268] [2022-11-23 14:43:44,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132982268] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:43:44,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1129980666] [2022-11-23 14:43:44,898 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:43:44,898 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:43:44,898 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:43:44,898 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:43:44,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:43:51,355 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-23 14:43:51,396 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:43:51,409 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:43:55,403 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36359#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:43:55,404 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:43:55,404 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:43:55,404 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2022-11-23 14:43:55,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407991108] [2022-11-23 14:43:55,404 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:43:55,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-23 14:43:55,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:43:55,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-23 14:43:55,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1404, Unknown=0, NotChecked=0, Total=1560 [2022-11-23 14:43:55,406 INFO L87 Difference]: Start difference. First operand 1396 states and 2205 transitions. Second operand has 23 states, 22 states have (on average 2.727272727272727) internal successors, (60), 21 states have internal predecessors, (60), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) [2022-11-23 14:43:59,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:43:59,686 INFO L93 Difference]: Finished difference Result 2415 states and 3812 transitions. [2022-11-23 14:43:59,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-23 14:43:59,686 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.727272727272727) internal successors, (60), 21 states have internal predecessors, (60), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) Word has length 111 [2022-11-23 14:43:59,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:43:59,695 INFO L225 Difference]: With dead ends: 2415 [2022-11-23 14:43:59,695 INFO L226 Difference]: Without dead ends: 1588 [2022-11-23 14:43:59,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 260 SyntacticMatches, 33 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2129 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=704, Invalid=3586, Unknown=0, NotChecked=0, Total=4290 [2022-11-23 14:43:59,702 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 137 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 1026 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 226 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-23 14:43:59,702 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 366 Invalid, 1026 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [226 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-23 14:43:59,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1588 states. [2022-11-23 14:44:02,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1588 to 1445. [2022-11-23 14:44:02,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1445 states, 773 states have (on average 1.279430789133247) internal successors, (989), 794 states have internal predecessors, (989), 633 states have call successors, (633), 38 states have call predecessors, (633), 38 states have return successors, (631), 612 states have call predecessors, (631), 631 states have call successors, (631) [2022-11-23 14:44:02,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1445 states to 1445 states and 2253 transitions. [2022-11-23 14:44:02,126 INFO L78 Accepts]: Start accepts. Automaton has 1445 states and 2253 transitions. Word has length 111 [2022-11-23 14:44:02,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:44:02,126 INFO L495 AbstractCegarLoop]: Abstraction has 1445 states and 2253 transitions. [2022-11-23 14:44:02,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.727272727272727) internal successors, (60), 21 states have internal predecessors, (60), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) [2022-11-23 14:44:02,127 INFO L276 IsEmpty]: Start isEmpty. Operand 1445 states and 2253 transitions. [2022-11-23 14:44:02,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-23 14:44:02,130 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:44:02,130 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:44:02,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 14:44:02,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:44:02,335 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:44:02,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:44:02,336 INFO L85 PathProgramCache]: Analyzing trace with hash -1541942719, now seen corresponding path program 4 times [2022-11-23 14:44:02,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:44:02,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946423772] [2022-11-23 14:44:02,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:44:02,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:44:02,344 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:44:02,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1460177679] [2022-11-23 14:44:02,345 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:44:02,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:44:02,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:44:02,346 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:44:02,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-23 14:44:02,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:44:02,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-23 14:44:02,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:44:02,712 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 96 proven. 50 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2022-11-23 14:44:02,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:44:03,143 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 51 proven. 51 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2022-11-23 14:44:03,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:44:03,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946423772] [2022-11-23 14:44:03,144 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:44:03,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1460177679] [2022-11-23 14:44:03,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1460177679] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:44:03,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1513682534] [2022-11-23 14:44:03,145 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:44:03,146 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:44:03,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:44:03,146 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:44:03,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:44:09,699 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-23 14:44:09,740 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:44:09,753 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:44:12,828 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43552#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:44:12,829 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:44:12,829 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:44:12,829 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16] total 26 [2022-11-23 14:44:12,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83110366] [2022-11-23 14:44:12,829 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:44:12,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 14:44:12,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:44:12,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 14:44:12,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1552, Unknown=0, NotChecked=0, Total=1722 [2022-11-23 14:44:12,831 INFO L87 Difference]: Start difference. First operand 1445 states and 2253 transitions. Second operand has 26 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) [2022-11-23 14:44:24,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:44:24,711 INFO L93 Difference]: Finished difference Result 2721 states and 4271 transitions. [2022-11-23 14:44:24,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-23 14:44:24,712 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) Word has length 116 [2022-11-23 14:44:24,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:44:24,724 INFO L225 Difference]: With dead ends: 2721 [2022-11-23 14:44:24,724 INFO L226 Difference]: Without dead ends: 2254 [2022-11-23 14:44:24,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 279 SyntacticMatches, 27 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6473 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=3194, Invalid=14098, Unknown=0, NotChecked=0, Total=17292 [2022-11-23 14:44:24,729 INFO L413 NwaCegarLoop]: 193 mSDtfsCounter, 359 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 1958 mSolverCounterSat, 1299 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 676 SdHoareTripleChecker+Invalid, 3257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1299 IncrementalHoareTripleChecker+Valid, 1958 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:44:24,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [359 Valid, 676 Invalid, 3257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1299 Valid, 1958 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-11-23 14:44:24,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2254 states. [2022-11-23 14:44:27,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2254 to 1685. [2022-11-23 14:44:27,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1685 states, 893 states have (on average 1.2777155655095185) internal successors, (1141), 914 states have internal predecessors, (1141), 753 states have call successors, (753), 38 states have call predecessors, (753), 38 states have return successors, (751), 732 states have call predecessors, (751), 751 states have call successors, (751) [2022-11-23 14:44:27,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1685 states to 1685 states and 2645 transitions. [2022-11-23 14:44:27,678 INFO L78 Accepts]: Start accepts. Automaton has 1685 states and 2645 transitions. Word has length 116 [2022-11-23 14:44:27,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:44:27,679 INFO L495 AbstractCegarLoop]: Abstraction has 1685 states and 2645 transitions. [2022-11-23 14:44:27,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) [2022-11-23 14:44:27,679 INFO L276 IsEmpty]: Start isEmpty. Operand 1685 states and 2645 transitions. [2022-11-23 14:44:27,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-23 14:44:27,682 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:44:27,682 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 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 14:44:27,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-23 14:44:27,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-23 14:44:27,888 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:44:27,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:44:27,888 INFO L85 PathProgramCache]: Analyzing trace with hash -1702861936, now seen corresponding path program 3 times [2022-11-23 14:44:27,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:44:27,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126112267] [2022-11-23 14:44:27,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:44:27,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:44:27,898 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:44:27,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1768719378] [2022-11-23 14:44:27,898 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:44:27,898 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:44:27,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:44:27,899 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:44:27,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-23 14:44:27,984 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:44:27,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:44:27,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 97 conjunts are in the unsatisfiable core [2022-11-23 14:44:27,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:44:29,841 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 36 proven. 101 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2022-11-23 14:44:29,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:44:34,014 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 34 proven. 99 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2022-11-23 14:44:34,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:44:34,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126112267] [2022-11-23 14:44:34,014 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:44:34,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768719378] [2022-11-23 14:44:34,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768719378] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:44:34,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1270542538] [2022-11-23 14:44:34,016 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:44:34,016 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:44:34,017 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:44:34,017 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:44:34,017 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:44:39,980 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-23 14:44:40,022 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:44:40,035 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:44:54,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51869#(and (<= 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|))' at error location [2022-11-23 14:44:54,175 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:44:54,175 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:44:54,175 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2022-11-23 14:44:54,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214248128] [2022-11-23 14:44:54,176 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:44:54,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-23 14:44:54,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:44:54,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-23 14:44:54,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=2552, Unknown=0, NotChecked=0, Total=2862 [2022-11-23 14:44:54,177 INFO L87 Difference]: Start difference. First operand 1685 states and 2645 transitions. Second operand has 37 states, 33 states have (on average 2.1515151515151514) internal successors, (71), 33 states have internal predecessors, (71), 14 states have call successors, (40), 3 states have call predecessors, (40), 3 states have return successors, (39), 12 states have call predecessors, (39), 12 states have call successors, (39) [2022-11-23 14:45:10,462 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:45:21,915 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:45:43,282 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:45:58,156 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:46:06,281 WARN L539 Checker$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 14:46:23,337 WARN L233 SmtUtils]: Spent 5.40s on a formula simplification. DAG size of input: 106 DAG size of output: 103 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:46:31,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:46:31,478 INFO L93 Difference]: Finished difference Result 2047 states and 3172 transitions. [2022-11-23 14:46:31,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-23 14:46:31,479 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 33 states have (on average 2.1515151515151514) internal successors, (71), 33 states have internal predecessors, (71), 14 states have call successors, (40), 3 states have call predecessors, (40), 3 states have return successors, (39), 12 states have call predecessors, (39), 12 states have call successors, (39) Word has length 125 [2022-11-23 14:46:31,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:46:31,484 INFO L225 Difference]: With dead ends: 2047 [2022-11-23 14:46:31,484 INFO L226 Difference]: Without dead ends: 1516 [2022-11-23 14:46:31,488 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 294 SyntacticMatches, 27 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4492 ImplicationChecksByTransitivity, 65.3s TimeCoverageRelationStatistics Valid=1542, Invalid=8962, Unknown=2, NotChecked=0, Total=10506 [2022-11-23 14:46:31,489 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 323 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 2513 mSolverCounterSat, 499 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 45.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 3017 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 499 IncrementalHoareTripleChecker+Valid, 2513 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 45.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:46:31,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [327 Valid, 370 Invalid, 3017 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [499 Valid, 2513 Invalid, 5 Unknown, 0 Unchecked, 45.6s Time] [2022-11-23 14:46:31,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1516 states. [2022-11-23 14:46:34,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1516 to 1477. [2022-11-23 14:46:34,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1477 states, 783 states have (on average 1.2707535121328224) internal successors, (995), 800 states have internal predecessors, (995), 661 states have call successors, (661), 32 states have call predecessors, (661), 32 states have return successors, (659), 644 states have call predecessors, (659), 659 states have call successors, (659) [2022-11-23 14:46:34,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1477 states to 1477 states and 2315 transitions. [2022-11-23 14:46:34,587 INFO L78 Accepts]: Start accepts. Automaton has 1477 states and 2315 transitions. Word has length 125 [2022-11-23 14:46:34,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:46:34,587 INFO L495 AbstractCegarLoop]: Abstraction has 1477 states and 2315 transitions. [2022-11-23 14:46:34,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 33 states have (on average 2.1515151515151514) internal successors, (71), 33 states have internal predecessors, (71), 14 states have call successors, (40), 3 states have call predecessors, (40), 3 states have return successors, (39), 12 states have call predecessors, (39), 12 states have call successors, (39) [2022-11-23 14:46:34,588 INFO L276 IsEmpty]: Start isEmpty. Operand 1477 states and 2315 transitions. [2022-11-23 14:46:34,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-23 14:46:34,591 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:46:34,591 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 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 14:46:34,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-23 14:46:34,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:46:34,806 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:46:34,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:46:34,807 INFO L85 PathProgramCache]: Analyzing trace with hash -1054120344, now seen corresponding path program 4 times [2022-11-23 14:46:34,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:46:34,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770909837] [2022-11-23 14:46:34,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:46:34,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:46:34,826 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 14:46:34,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1696057727] [2022-11-23 14:46:34,831 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:46:34,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:46:34,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:46:34,832 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:46:34,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1625e9c1-1ed7-48c3-8608-e63d7b29eb67/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-23 14:46:34,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:46:34,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 99 conjunts are in the unsatisfiable core [2022-11-23 14:46:34,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:46:36,740 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 71 proven. 66 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2022-11-23 14:46:36,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:46:46,909 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 70 proven. 63 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2022-11-23 14:46:46,909 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:46:46,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770909837] [2022-11-23 14:46:46,909 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 14:46:46,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696057727] [2022-11-23 14:46:46,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696057727] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:46:46,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [960815804] [2022-11-23 14:46:46,911 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-23 14:46:46,911 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:46:46,911 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:46:46,912 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:46:46,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:46:52,562 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-23 14:46:52,566 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-23 14:46:52,578 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:47:12,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58627#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:47:12,412 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:47:12,412 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:47:12,412 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 38 [2022-11-23 14:47:12,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111843589] [2022-11-23 14:47:12,412 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:47:12,413 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-23 14:47:12,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:12,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-23 14:47:12,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=2628, Unknown=0, NotChecked=0, Total=2970 [2022-11-23 14:47:12,414 INFO L87 Difference]: Start difference. First operand 1477 states and 2315 transitions. Second operand has 38 states, 35 states have (on average 2.057142857142857) internal successors, (72), 36 states have internal predecessors, (72), 14 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) [2022-11-23 14:47:16,963 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:47:26,887 WARN L233 SmtUtils]: Spent 7.21s on a formula simplification that was a NOOP. DAG size: 108 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:47:29,673 WARN L539 Checker$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 14:47:49,507 WARN L233 SmtUtils]: Spent 5.49s on a formula simplification that was a NOOP. DAG size: 128 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:47:52,675 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:47:54,684 WARN L539 Checker$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 14:47:56,688 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:47:57,860 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:47:59,865 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:48:05,983 WARN L539 Checker$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 14:48:19,104 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:48:27,398 WARN L539 Checker$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 14:48:29,400 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:48:31,405 WARN L539 Checker$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 14:48:34,603 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:48:40,726 WARN L539 Checker$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 14:48:43,758 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-23 14:48:54,420 WARN L233 SmtUtils]: Spent 7.96s on a formula simplification that was a NOOP. DAG size: 103 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)