/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/ps6-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:28:42,784 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:28:42,786 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:28:42,811 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 19:28:42,811 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 19:28:42,812 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 19:28:42,813 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 19:28:42,815 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 19:28:42,817 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 19:28:42,818 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 19:28:42,819 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 19:28:42,820 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2021-05-02 19:28:42,870 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:28:42,871 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:28:42,871 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:28:42,876 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:28:42,892 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:28:42,892 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:28:42,895 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:28:42,895 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:28:42,895 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:28:42,895 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:28:42,895 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:28:42,895 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:28:42,895 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:28:42,895 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:28:42,895 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:28:42,896 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:28:42,896 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:28:42,896 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:28:42,896 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:28:42,896 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:28:42,896 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:28:42,896 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:28:42,897 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:28:42,897 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:28:42,897 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:28:42,898 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:28:42,898 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:28:43,150 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:28:43,167 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:28:43,169 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:28:43,170 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:28:43,170 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:28:43,171 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps6-ll.c [2021-05-02 19:28:43,221 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/949044390/29dacb63a1f84ca49e815c0e0d10c55b/FLAG4dd38e49e [2021-05-02 19:28:43,607 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:28:43,608 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps6-ll.c [2021-05-02 19:28:43,613 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/949044390/29dacb63a1f84ca49e815c0e0d10c55b/FLAG4dd38e49e [2021-05-02 19:28:44,031 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/949044390/29dacb63a1f84ca49e815c0e0d10c55b [2021-05-02 19:28:44,037 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:28:44,038 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:28:44,040 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:28:44,040 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:28:44,043 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:28:44,044 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,045 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34127bcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44, skipping insertion in model container [2021-05-02 19:28:44,045 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,050 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:28:44,065 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:28:44,159 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/ps6-ll.c[458,471] [2021-05-02 19:28:44,171 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:28:44,178 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:28:44,187 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/ps6-ll.c[458,471] [2021-05-02 19:28:44,194 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:28:44,205 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:28:44,205 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44 WrapperNode [2021-05-02 19:28:44,205 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:28:44,206 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:28:44,206 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:28:44,206 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:28:44,223 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,223 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,229 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,229 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,239 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,244 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,245 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,252 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:28:44,260 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:28:44,260 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:28:44,260 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:28:44,261 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44" (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 [2021-05-02 19:28:44,338 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:28:44,339 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:28:44,339 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:28:44,339 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 19:28:44,339 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 19:28:44,339 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:28:44,340 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 19:28:44,340 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:28:44,340 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:28:44,340 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:28:44,340 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 19:28:44,340 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 19:28:44,341 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 19:28:44,341 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:28:44,341 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:28:44,341 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:28:44,341 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:28:44,342 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:28:44,342 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:28:44,342 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:28:44,587 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:28:44,588 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 19:28:44,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:28:44 BoogieIcfgContainer [2021-05-02 19:28:44,589 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:28:44,590 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:28:44,590 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:28:44,590 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:28:44,592 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:28:44" (1/1) ... [2021-05-02 19:28:44,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:28:44 BasicIcfg [2021-05-02 19:28:44,606 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:28:44,607 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:28:44,607 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:28:44,609 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:28:44,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:28:44" (1/4) ... [2021-05-02 19:28:44,610 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53f44056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:28:44, skipping insertion in model container [2021-05-02 19:28:44,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:28:44" (2/4) ... [2021-05-02 19:28:44,610 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53f44056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:28:44, skipping insertion in model container [2021-05-02 19:28:44,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:28:44" (3/4) ... [2021-05-02 19:28:44,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53f44056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:28:44, skipping insertion in model container [2021-05-02 19:28:44,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:28:44" (4/4) ... [2021-05-02 19:28:44,612 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll.cJordan [2021-05-02 19:28:44,628 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:28:44,632 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:28:44,661 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:28:44,691 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:28:44,691 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:28:44,691 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:28:44,691 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:28:44,691 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:28:44,692 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:28:44,692 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:28:44,692 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:28:44,717 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 19:28:44,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 19:28:44,724 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:28:44,724 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:28:44,724 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:28:44,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:28:44,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1885409022, now seen corresponding path program 1 times [2021-05-02 19:28:44,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:28:44,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916483261] [2021-05-02 19:28:44,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:28:44,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:28:44,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:28:44,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:28:44,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 19:28:44,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:28:44,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:28:44,997 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:28:44,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916483261] [2021-05-02 19:28:44,998 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916483261] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:28:44,998 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:28:44,998 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:28:44,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960669052] [2021-05-02 19:28:45,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:28:45,004 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:28:45,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:28:45,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:28:45,017 INFO L87 Difference]: Start difference. First operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 19:28:52,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:28:52,957 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-05-02 19:28:52,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:28:52,959 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-02 19:28:52,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:28:52,965 INFO L225 Difference]: With dead ends: 28 [2021-05-02 19:28:52,965 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 19:28:52,966 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 45.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:28:52,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 19:28:52,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 19:28:52,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 19:28:52,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-05-02 19:28:52,993 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2021-05-02 19:28:52,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:28:52,993 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-05-02 19:28:52,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 19:28:52,994 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-05-02 19:28:52,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 19:28:52,994 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:28:52,994 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:28:52,995 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:28:52,995 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:28:52,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:28:52,996 INFO L82 PathProgramCache]: Analyzing trace with hash 603980644, now seen corresponding path program 1 times [2021-05-02 19:28:52,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:28:52,996 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26702881] [2021-05-02 19:28:52,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:28:53,009 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:28:53,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [817983512] [2021-05-02 19:28:53,010 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 [2021-05-02 19:28:53,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:28:53,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 19:28:53,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:28:53,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:53,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:28:53,189 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:28:53,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26702881] [2021-05-02 19:28:53,189 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:28:53,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817983512] [2021-05-02 19:28:53,190 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817983512] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:28:53,190 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:28:53,190 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 19:28:53,190 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761129834] [2021-05-02 19:28:53,191 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:28:53,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:28:53,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:28:53,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:28:53,192 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 19:28:53,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:28:53,318 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-02 19:28:53,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:28:53,319 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-02 19:28:53,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:28:53,320 INFO L225 Difference]: With dead ends: 32 [2021-05-02 19:28:53,320 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 19:28:53,321 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 36.0ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:28:53,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 19:28:53,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 19:28:53,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 19:28:53,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 19:28:53,331 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 17 [2021-05-02 19:28:53,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:28:53,333 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 19:28:53,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 19:28:53,333 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 19:28:53,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 19:28:53,334 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:28:53,334 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:28:53,550 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 19:28:53,550 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:28:53,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:28:53,551 INFO L82 PathProgramCache]: Analyzing trace with hash -169450186, now seen corresponding path program 1 times [2021-05-02 19:28:53,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:28:53,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014377871] [2021-05-02 19:28:53,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:28:53,567 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:28:53,567 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2094718213] [2021-05-02 19:28:53,568 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 [2021-05-02 19:28:53,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:28:53,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 19:28:53,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:28:53,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:53,743 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:28:53,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:28:53,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014377871] [2021-05-02 19:28:53,743 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:28:53,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094718213] [2021-05-02 19:28:53,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094718213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:28:53,744 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:28:53,744 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 19:28:53,744 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740330292] [2021-05-02 19:28:53,744 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:28:53,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:28:53,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:28:53,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:28:53,745 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 19:28:54,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:28:54,077 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-05-02 19:28:54,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:28:54,078 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-02 19:28:54,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:28:54,079 INFO L225 Difference]: With dead ends: 39 [2021-05-02 19:28:54,079 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 19:28:54,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 45.0ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:28:54,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 19:28:54,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-02 19:28:54,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 25 states have internal predecessors, (26), 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) [2021-05-02 19:28:54,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-05-02 19:28:54,085 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 24 [2021-05-02 19:28:54,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:28:54,086 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-05-02 19:28:54,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 19:28:54,086 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-05-02 19:28:54,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 19:28:54,087 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:28:54,087 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:28:54,309 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:28:54,309 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:28:54,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:28:54,310 INFO L82 PathProgramCache]: Analyzing trace with hash -570969308, now seen corresponding path program 2 times [2021-05-02 19:28:54,310 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:28:54,311 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601666127] [2021-05-02 19:28:54,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:28:54,333 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:28:54,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [263817527] [2021-05-02 19:28:54,334 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2021-05-02 19:28:54,425 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:28:54,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:28:54,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 19:28:54,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:28:54,559 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 19:28:54,560 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:28:54,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601666127] [2021-05-02 19:28:54,560 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:28:54,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [263817527] [2021-05-02 19:28:54,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [263817527] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:28:54,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:28:54,561 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 19:28:54,561 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845443923] [2021-05-02 19:28:54,561 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:28:54,561 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:28:54,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:28:54,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:28:54,562 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 19:28:58,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:28:58,795 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2021-05-02 19:28:58,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:28:58,814 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-05-02 19:28:58,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:28:58,815 INFO L225 Difference]: With dead ends: 48 [2021-05-02 19:28:58,815 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 19:28:58,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 64.6ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 19:28:58,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 19:28:58,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 19:28:58,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 31 states have internal predecessors, (32), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 19:28:58,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-05-02 19:28:58,821 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 31 [2021-05-02 19:28:58,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:28:58,821 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-05-02 19:28:58,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 19:28:58,822 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-05-02 19:28:58,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 19:28:58,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:28:58,823 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:28:59,026 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:28:59,026 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:28:59,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:28:59,026 INFO L82 PathProgramCache]: Analyzing trace with hash -124222480, now seen corresponding path program 1 times [2021-05-02 19:28:59,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:28:59,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274361001] [2021-05-02 19:28:59,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:28:59,036 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:28:59,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1351206344] [2021-05-02 19:28:59,036 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 [2021-05-02 19:28:59,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:28:59,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 19:28:59,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:28:59,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:28:59,325 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 19:28:59,325 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:28:59,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274361001] [2021-05-02 19:28:59,325 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:28:59,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351206344] [2021-05-02 19:28:59,326 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351206344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:28:59,326 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:28:59,326 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 19:28:59,326 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643992735] [2021-05-02 19:28:59,326 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:28:59,326 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:28:59,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:28:59,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:28:59,327 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 19:29:01,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:29:01,272 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2021-05-02 19:29:01,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 19:29:01,272 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 35 [2021-05-02 19:29:01,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:29:01,274 INFO L225 Difference]: With dead ends: 51 [2021-05-02 19:29:01,274 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 19:29:01,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 94.3ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 19:29:01,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 19:29:01,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 19:29:01,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 30 states have internal predecessors, (31), 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) [2021-05-02 19:29:01,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2021-05-02 19:29:01,280 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 35 [2021-05-02 19:29:01,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:29:01,280 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2021-05-02 19:29:01,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 19:29:01,280 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2021-05-02 19:29:01,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 19:29:01,281 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:29:01,281 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:29:01,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:29:01,485 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:29:01,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:29:01,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1050508662, now seen corresponding path program 3 times [2021-05-02 19:29:01,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:29:01,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659247058] [2021-05-02 19:29:01,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:29:01,499 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:29:01,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1405722245] [2021-05-02 19:29:01,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2021-05-02 19:29:01,648 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 19:29:01,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:29:01,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 19:29:01,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:29:01,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:29:01,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:29:01,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:29:01,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:59,014 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 19:30:59,015 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:30:59,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659247058] [2021-05-02 19:30:59,015 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:30:59,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405722245] [2021-05-02 19:30:59,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405722245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:30:59,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:30:59,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 19:30:59,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654793010] [2021-05-02 19:30:59,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:30:59,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:30:59,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:30:59,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=29, Unknown=1, NotChecked=0, Total=42 [2021-05-02 19:30:59,016 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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) [2021-05-02 19:31:01,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:31:01,182 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2021-05-02 19:31:01,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:31:01,182 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 38 [2021-05-02 19:31:01,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:31:01,183 INFO L225 Difference]: With dead ends: 49 [2021-05-02 19:31:01,183 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 19:31:01,184 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 117258.1ms TimeCoverageRelationStatistics Valid=23, Invalid=48, Unknown=1, NotChecked=0, Total=72 [2021-05-02 19:31:01,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 19:31:01,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2021-05-02 19:31:01,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 19:31:01,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-05-02 19:31:01,188 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 38 [2021-05-02 19:31:01,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:31:01,188 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-05-02 19:31:01,188 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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) [2021-05-02 19:31:01,188 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-05-02 19:31:01,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 19:31:01,189 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:31:01,189 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:31:01,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 19:31:01,392 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:31:01,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:31:01,393 INFO L82 PathProgramCache]: Analyzing trace with hash -1580411582, now seen corresponding path program 2 times [2021-05-02 19:31:01,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:31:01,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064402065] [2021-05-02 19:31:01,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:31:01,400 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:31:01,400 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1551212036] [2021-05-02 19:31:01,401 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:31:01,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:31:01,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:31:01,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 19:31:01,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:31:01,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:31:01,740 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 20 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 19:31:01,741 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:31:01,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064402065] [2021-05-02 19:31:01,741 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:31:01,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551212036] [2021-05-02 19:31:01,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1551212036] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:31:01,741 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:31:01,741 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 19:31:01,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060956530] [2021-05-02 19:31:01,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 19:31:01,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:31:01,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 19:31:01,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:31:01,742 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 12 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 19:31:01,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:31:01,923 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2021-05-02 19:31:01,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 19:31:01,924 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 42 [2021-05-02 19:31:01,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:31:01,925 INFO L225 Difference]: With dead ends: 50 [2021-05-02 19:31:01,925 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 19:31:01,925 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 150.2ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-02 19:31:01,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 19:31:01,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 19:31:01,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 19:31:01,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-05-02 19:31:01,933 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 42 [2021-05-02 19:31:01,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:31:01,933 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-05-02 19:31:01,933 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 19:31:01,933 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-05-02 19:31:01,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 19:31:01,934 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:31:01,934 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:31:02,136 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:31:02,137 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:31:02,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:31:02,137 INFO L82 PathProgramCache]: Analyzing trace with hash 2070660016, now seen corresponding path program 3 times [2021-05-02 19:31:02,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:31:02,138 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799682045] [2021-05-02 19:31:02,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:31:02,152 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:31:02,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [449177541] [2021-05-02 19:31:02,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true