/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 10:10:08,534 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 10:10:08,536 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 10:10:08,567 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 10:10:08,568 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 10:10:08,570 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 10:10:08,572 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 10:10:08,576 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 10:10:08,577 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 10:10:08,580 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 10:10:08,581 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 10:10:08,582 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 10:10:08,582 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 10:10:08,583 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 10:10:08,584 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 10:10:08,585 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 10:10:08,587 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 10:10:08,587 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 10:10:08,589 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 10:10:08,593 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 10:10:08,594 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 10:10:08,595 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 10:10:08,595 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 10:10:08,597 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 10:10:08,601 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 10:10:08,608 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 10:10:08,609 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 10:10:08,609 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 10:10:08,612 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 10:10:08,625 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 10:10:08,625 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 10:10:08,627 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 10:10:08,628 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 10:10:08,628 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 10:10:08,628 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 10:10:08,628 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 10:10:08,628 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 10:10:08,628 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 10:10:08,628 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 10:10:08,629 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 10:10:08,629 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 10:10:08,629 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 10:10:08,629 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 10:10:08,629 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 10:10:08,630 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 10:10:08,630 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 10:10:08,630 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 10:10:08,630 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 10:10:08,630 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 10:10:08,630 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 10:10:08,631 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 10:10:08,631 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 10:10:08,884 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 10:10:08,898 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 10:10:08,900 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 10:10:08,901 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 10:10:08,901 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 10:10:08,902 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound10.c [2021-05-06 10:10:08,941 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/83d5af8a1/0d3ebcef46fa4be0ba529419beff7696/FLAG54d751116 [2021-05-06 10:10:09,299 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 10:10:09,300 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound10.c [2021-05-06 10:10:09,304 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/83d5af8a1/0d3ebcef46fa4be0ba529419beff7696/FLAG54d751116 [2021-05-06 10:10:09,729 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/83d5af8a1/0d3ebcef46fa4be0ba529419beff7696 [2021-05-06 10:10:09,731 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 10:10:09,732 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 10:10:09,741 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 10:10:09,741 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 10:10:09,744 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 10:10:09,745 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 10:10:09" (1/1) ... [2021-05-06 10:10:09,745 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40150eac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09, skipping insertion in model container [2021-05-06 10:10:09,748 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 10:10:09" (1/1) ... [2021-05-06 10:10:09,759 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 10:10:09,770 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 10:10:09,858 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound10.c[537,550] [2021-05-06 10:10:09,865 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 10:10:09,870 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 10:10:09,901 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prodbin-ll_valuebound10.c[537,550] [2021-05-06 10:10:09,905 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 10:10:09,919 INFO L208 MainTranslator]: Completed translation [2021-05-06 10:10:09,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09 WrapperNode [2021-05-06 10:10:09,920 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 10:10:09,921 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 10:10:09,921 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 10:10:09,921 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 10:10:09,928 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09" (1/1) ... [2021-05-06 10:10:09,928 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09" (1/1) ... [2021-05-06 10:10:09,934 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09" (1/1) ... [2021-05-06 10:10:09,934 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09" (1/1) ... [2021-05-06 10:10:09,946 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09" (1/1) ... [2021-05-06 10:10:09,949 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09" (1/1) ... [2021-05-06 10:10:09,950 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09" (1/1) ... [2021-05-06 10:10:09,956 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 10:10:09,957 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 10:10:09,957 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 10:10:09,957 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 10:10:09,958 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 10:10:10,010 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 10:10:10,010 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 10:10:10,010 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 10:10:10,010 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 10:10:10,010 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 10:10:10,011 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 10:10:10,011 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 10:10:10,011 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 10:10:10,015 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 10:10:10,016 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 10:10:10,016 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 10:10:10,016 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 10:10:10,016 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 10:10:10,017 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 10:10:10,017 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 10:10:10,017 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 10:10:10,017 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 10:10:10,017 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 10:10:10,018 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 10:10:10,018 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 10:10:10,230 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 10:10:10,230 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 10:10:10,231 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 10:10:10 BoogieIcfgContainer [2021-05-06 10:10:10,231 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 10:10:10,232 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 10:10:10,232 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 10:10:10,232 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 10:10:10,234 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 10:10:10" (1/1) ... [2021-05-06 10:10:10,259 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 10:10:10 BasicIcfg [2021-05-06 10:10:10,259 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 10:10:10,265 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 10:10:10,266 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 10:10:10,268 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 10:10:10,268 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 10:10:09" (1/4) ... [2021-05-06 10:10:10,269 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ab10ea5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 10:10:10, skipping insertion in model container [2021-05-06 10:10:10,269 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:10:09" (2/4) ... [2021-05-06 10:10:10,269 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ab10ea5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 10:10:10, skipping insertion in model container [2021-05-06 10:10:10,269 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 10:10:10" (3/4) ... [2021-05-06 10:10:10,269 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ab10ea5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 10:10:10, skipping insertion in model container [2021-05-06 10:10:10,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 10:10:10" (4/4) ... [2021-05-06 10:10:10,270 INFO L111 eAbstractionObserver]: Analyzing ICFG prodbin-ll_valuebound10.cJordan [2021-05-06 10:10:10,274 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 10:10:10,276 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 10:10:10,286 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 10:10:10,298 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 10:10:10,298 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 10:10:10,298 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 10:10:10,298 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 10:10:10,298 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 10:10:10,298 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 10:10:10,298 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 10:10:10,298 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 10:10:10,306 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 10:10:10,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 10:10:10,311 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:10:10,311 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:10:10,312 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:10:10,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:10:10,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1656134296, now seen corresponding path program 1 times [2021-05-06 10:10:10,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:10:10,321 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005200901] [2021-05-06 10:10:10,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:10:10,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:10,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 10:10:10,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:10,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 10:10:10,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:10,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-06 10:10:10,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:10,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 10:10:10,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:10,523 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 10:10:10,524 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:10:10,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005200901] [2021-05-06 10:10:10,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005200901] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 10:10:10,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 10:10:10,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 10:10:10,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118823775] [2021-05-06 10:10:10,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 10:10:10,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:10:10,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 10:10:10,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 10:10:10,540 INFO L87 Difference]: Start difference. First operand has 32 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 10:10:10,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:10:10,614 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-06 10:10:10,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 10:10:10,616 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2021-05-06 10:10:10,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:10:10,621 INFO L225 Difference]: With dead ends: 32 [2021-05-06 10:10:10,621 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 10:10:10,623 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 10:10:10,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 10:10:10,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-06 10:10:10,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:10:10,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-05-06 10:10:10,649 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 28 [2021-05-06 10:10:10,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:10:10,650 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-05-06 10:10:10,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 10:10:10,651 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-05-06 10:10:10,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 10:10:10,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:10:10,652 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:10:10,653 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 10:10:10,653 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:10:10,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:10:10,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1063826184, now seen corresponding path program 1 times [2021-05-06 10:10:10,655 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:10:10,655 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565193562] [2021-05-06 10:10:10,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:10:10,688 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:10:10,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1498651774] [2021-05-06 10:10:10,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:10:10,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:10,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 10:10:10,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:10:10,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:10,899 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 10:10:10,899 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:10:10,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565193562] [2021-05-06 10:10:10,900 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:10:10,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498651774] [2021-05-06 10:10:10,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498651774] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 10:10:10,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 10:10:10,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 10:10:10,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770071175] [2021-05-06 10:10:10,901 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 10:10:10,901 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:10:10,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 10:10:10,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 10:10:10,903 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 10:10:10,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:10:10,965 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-05-06 10:10:10,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 10:10:10,969 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2021-05-06 10:10:10,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:10:10,969 INFO L225 Difference]: With dead ends: 37 [2021-05-06 10:10:10,969 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 10:10:10,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 10:10:10,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 10:10:10,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2021-05-06 10:10:10,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 20 states have (on average 1.15) internal successors, (23), 22 states have internal predecessors, (23), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:10:10,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-05-06 10:10:10,974 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 28 [2021-05-06 10:10:10,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:10:10,975 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-05-06 10:10:10,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 10:10:10,975 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-05-06 10:10:10,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 10:10:10,976 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:10:10,976 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:10:11,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 10:10:11,177 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:10:11,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:10:11,177 INFO L82 PathProgramCache]: Analyzing trace with hash -499634320, now seen corresponding path program 1 times [2021-05-06 10:10:11,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:10:11,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711751175] [2021-05-06 10:10:11,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:10:11,187 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:10:11,187 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [25178243] [2021-05-06 10:10:11,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:10:11,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:11,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 10:10:11,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:10:11,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:11,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:11,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:11,350 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-06 10:10:11,351 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:10:11,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711751175] [2021-05-06 10:10:11,351 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:10:11,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25178243] [2021-05-06 10:10:11,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25178243] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 10:10:11,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 10:10:11,351 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 10:10:11,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55609035] [2021-05-06 10:10:11,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 10:10:11,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:10:11,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 10:10:11,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 10:10:11,352 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 10:10:11,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:10:11,405 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-06 10:10:11,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 10:10:11,405 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2021-05-06 10:10:11,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:10:11,406 INFO L225 Difference]: With dead ends: 36 [2021-05-06 10:10:11,406 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 10:10:11,406 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 20.1ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 10:10:11,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 10:10:11,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2021-05-06 10:10:11,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:10:11,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-06 10:10:11,410 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 34 [2021-05-06 10:10:11,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:10:11,410 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-06 10:10:11,410 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 10:10:11,410 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-06 10:10:11,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 10:10:11,411 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:10:11,411 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-05-06 10:10:11,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:10:11,629 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:10:11,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:10:11,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1096608558, now seen corresponding path program 1 times [2021-05-06 10:10:11,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:10:11,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491153324] [2021-05-06 10:10:11,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:10:11,649 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:10:11,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1225632956] [2021-05-06 10:10:11,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:10:11,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:11,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-06 10:10:11,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:10:11,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:11,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:11,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:11,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:11,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:11,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:11,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:12,103 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 10:10:12,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:10:12,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491153324] [2021-05-06 10:10:12,104 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:10:12,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225632956] [2021-05-06 10:10:12,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225632956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:10:12,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:10:12,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 10:10:12,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069980568] [2021-05-06 10:10:12,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 10:10:12,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:10:12,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 10:10:12,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-06 10:10:12,105 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 10:10:12,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:10:12,804 INFO L93 Difference]: Finished difference Result 47 states and 54 transitions. [2021-05-06 10:10:12,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 10:10:12,805 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 37 [2021-05-06 10:10:12,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:10:12,806 INFO L225 Difference]: With dead ends: 47 [2021-05-06 10:10:12,806 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 10:10:12,806 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 136.4ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-06 10:10:12,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 10:10:12,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 42. [2021-05-06 10:10:12,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 29 states have internal predecessors, (31), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 10:10:12,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-05-06 10:10:12,810 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 37 [2021-05-06 10:10:12,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:10:12,810 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-05-06 10:10:12,810 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 10:10:12,810 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-05-06 10:10:12,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 10:10:12,811 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:10:12,811 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-05-06 10:10:13,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:10:13,025 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:10:13,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:10:13,026 INFO L82 PathProgramCache]: Analyzing trace with hash -209104877, now seen corresponding path program 1 times [2021-05-06 10:10:13,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:10:13,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767153622] [2021-05-06 10:10:13,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:10:13,035 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:10:13,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [7876752] [2021-05-06 10:10:13,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:10:13,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:13,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-06 10:10:13,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:10:13,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,343 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-06 10:10:13,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:10:13,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767153622] [2021-05-06 10:10:13,343 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:10:13,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7876752] [2021-05-06 10:10:13,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7876752] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:10:13,343 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:10:13,343 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 10:10:13,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394345103] [2021-05-06 10:10:13,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 10:10:13,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:10:13,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 10:10:13,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-06 10:10:13,344 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 10:10:13,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:10:13,490 INFO L93 Difference]: Finished difference Result 52 states and 58 transitions. [2021-05-06 10:10:13,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 10:10:13,491 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 37 [2021-05-06 10:10:13,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:10:13,493 INFO L225 Difference]: With dead ends: 52 [2021-05-06 10:10:13,493 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 10:10:13,493 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 75.2ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 10:10:13,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 10:10:13,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2021-05-06 10:10:13,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 10:10:13,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-05-06 10:10:13,498 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 37 [2021-05-06 10:10:13,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:10:13,498 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-05-06 10:10:13,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 10:10:13,499 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-05-06 10:10:13,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 10:10:13,499 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:10:13,499 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1] [2021-05-06 10:10:13,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:10:13,700 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:10:13,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:10:13,701 INFO L82 PathProgramCache]: Analyzing trace with hash -266261558, now seen corresponding path program 1 times [2021-05-06 10:10:13,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:10:13,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459783486] [2021-05-06 10:10:13,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:10:13,714 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:10:13,714 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [584525026] [2021-05-06 10:10:13,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:10:13,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:10:13,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 10:10:13,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:10:13,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:10:13,891 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-06 10:10:13,891 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:10:13,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459783486] [2021-05-06 10:10:13,891 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:10:13,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584525026] [2021-05-06 10:10:13,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584525026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:10:13,891 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:10:13,891 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 10:10:13,891 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238539346] [2021-05-06 10:10:13,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 10:10:13,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:10:13,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 10:10:13,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 10:10:13,892 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6)