/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/divbin2_unwindbound50.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 20:03:40,159 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 20:03:40,162 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 20:03:40,202 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 20:03:40,220 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 20:03:40,222 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 20:03:40,223 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 20:03:40,224 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 20:03:40,227 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 20:03:40,227 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 20:03:40,230 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 20:03:40,236 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 20:03:40,238 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 20:03:40,239 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 20:03:40,240 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 20:03:40,242 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 20:03:40,252 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 20:03:40,273 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 20:03:40,274 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 20:03:40,275 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 20:03:40,275 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 20:03:40,294 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 20:03:40,295 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 20:03:40,298 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 20:03:40,298 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 20:03:40,298 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 20:03:40,298 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 20:03:40,298 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 20:03:40,298 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 20:03:40,299 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 20:03:40,299 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 20:03:40,300 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 20:03:40,300 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 20:03:40,300 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 20:03:40,300 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 20:03:40,300 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 20:03:40,300 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 20:03:40,301 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 20:03:40,301 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 20:03:40,301 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 20:03:40,301 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 20:03:40,301 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 20:03:40,302 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 20:03:40,302 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 20:03:40,574 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 20:03:40,595 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 20:03:40,598 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 20:03:40,599 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 20:03:40,599 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 20:03:40,600 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound50.i [2021-05-02 20:03:40,665 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef7dc67cc/d01f7119ea464c6dbca981618d6281e6/FLAGcf73b79f7 [2021-05-02 20:03:41,042 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 20:03:41,043 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound50.i [2021-05-02 20:03:41,049 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef7dc67cc/d01f7119ea464c6dbca981618d6281e6/FLAGcf73b79f7 [2021-05-02 20:03:41,439 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef7dc67cc/d01f7119ea464c6dbca981618d6281e6 [2021-05-02 20:03:41,446 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 20:03:41,448 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 20:03:41,451 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 20:03:41,451 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 20:03:41,455 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 20:03:41,455 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:03:41" (1/1) ... [2021-05-02 20:03:41,456 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54f4db02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41, skipping insertion in model container [2021-05-02 20:03:41,456 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:03:41" (1/1) ... [2021-05-02 20:03:41,463 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 20:03:41,477 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 20:03:41,594 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/divbin2_unwindbound50.i[959,972] [2021-05-02 20:03:41,605 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:03:41,614 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 20:03:41,674 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/divbin2_unwindbound50.i[959,972] [2021-05-02 20:03:41,690 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:03:41,706 INFO L208 MainTranslator]: Completed translation [2021-05-02 20:03:41,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41 WrapperNode [2021-05-02 20:03:41,707 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 20:03:41,708 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 20:03:41,708 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 20:03:41,708 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 20:03:41,719 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41" (1/1) ... [2021-05-02 20:03:41,719 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41" (1/1) ... [2021-05-02 20:03:41,725 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41" (1/1) ... [2021-05-02 20:03:41,726 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41" (1/1) ... [2021-05-02 20:03:41,738 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41" (1/1) ... [2021-05-02 20:03:41,742 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41" (1/1) ... [2021-05-02 20:03:41,747 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41" (1/1) ... [2021-05-02 20:03:41,752 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 20:03:41,753 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 20:03:41,753 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 20:03:41,754 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 20:03:41,754 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41" (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 20:03:41,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 20:03:41,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 20:03:41,826 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 20:03:41,826 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 20:03:41,827 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 20:03:41,827 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 20:03:41,827 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 20:03:41,827 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 20:03:41,827 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 20:03:41,827 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 20:03:41,827 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 20:03:41,828 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 20:03:41,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 20:03:41,828 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 20:03:41,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 20:03:41,828 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 20:03:41,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 20:03:41,829 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 20:03:41,829 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 20:03:41,829 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 20:03:41,830 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 20:03:41,830 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 20:03:42,164 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 20:03:42,164 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 20:03:42,166 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:03:42 BoogieIcfgContainer [2021-05-02 20:03:42,166 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 20:03:42,167 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 20:03:42,167 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 20:03:42,167 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 20:03:42,170 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:03:42" (1/1) ... [2021-05-02 20:03:42,185 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:03:42 BasicIcfg [2021-05-02 20:03:42,185 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 20:03:42,187 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 20:03:42,187 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 20:03:42,189 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 20:03:42,190 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 08:03:41" (1/4) ... [2021-05-02 20:03:42,190 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1681210d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:03:42, skipping insertion in model container [2021-05-02 20:03:42,190 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:03:41" (2/4) ... [2021-05-02 20:03:42,191 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1681210d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:03:42, skipping insertion in model container [2021-05-02 20:03:42,191 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:03:42" (3/4) ... [2021-05-02 20:03:42,191 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1681210d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 08:03:42, skipping insertion in model container [2021-05-02 20:03:42,191 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:03:42" (4/4) ... [2021-05-02 20:03:42,192 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound50.iJordan [2021-05-02 20:03:42,199 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 20:03:42,203 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 20:03:42,216 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 20:03:42,233 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 20:03:42,233 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 20:03:42,233 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 20:03:42,233 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 20:03:42,233 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 20:03:42,233 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 20:03:42,233 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 20:03:42,233 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 20:03:42,253 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:03:42,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 20:03:42,259 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:42,260 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:42,260 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:42,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:42,264 INFO L82 PathProgramCache]: Analyzing trace with hash 2097950667, now seen corresponding path program 1 times [2021-05-02 20:03:42,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:42,275 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507870286] [2021-05-02 20:03:42,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:42,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:42,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 20:03:42,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:42,550 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 20:03:42,551 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:42,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507870286] [2021-05-02 20:03:42,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507870286] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:03:42,552 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:03:42,553 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:03:42,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965553949] [2021-05-02 20:03:42,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:03:42,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:42,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:03:42,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:03:42,573 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:42,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:42,672 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-05-02 20:03:42,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:03:42,674 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 20:03:42,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:42,681 INFO L225 Difference]: With dead ends: 27 [2021-05-02 20:03:42,682 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 20:03:42,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 63.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:03:42,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 20:03:42,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 20:03:42,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:42,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-05-02 20:03:42,714 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 12 [2021-05-02 20:03:42,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:42,714 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-05-02 20:03:42,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:42,715 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-05-02 20:03:42,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 20:03:42,715 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:42,716 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:42,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 20:03:42,716 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:42,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:42,717 INFO L82 PathProgramCache]: Analyzing trace with hash 923003056, now seen corresponding path program 1 times [2021-05-02 20:03:42,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:42,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288622262] [2021-05-02 20:03:42,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:42,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:42,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 20:03:42,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:42,877 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 20:03:42,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:42,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288622262] [2021-05-02 20:03:42,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1288622262] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:03:42,878 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:03:42,878 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 20:03:42,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537082400] [2021-05-02 20:03:42,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:03:42,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:42,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:03:42,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:03:42,880 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:42,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:42,983 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2021-05-02 20:03:42,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:03:42,984 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 20:03:42,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:42,984 INFO L225 Difference]: With dead ends: 23 [2021-05-02 20:03:42,984 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 20:03:42,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 92.1ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:03:42,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 20:03:42,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 20:03:42,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:42,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-05-02 20:03:42,989 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 14 [2021-05-02 20:03:42,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:42,989 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-05-02 20:03:42,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:42,990 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-05-02 20:03:42,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 20:03:42,990 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:42,990 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:42,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 20:03:42,991 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:42,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:42,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1207414063, now seen corresponding path program 1 times [2021-05-02 20:03:42,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:42,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509774435] [2021-05-02 20:03:42,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:43,002 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:43,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1726930710] [2021-05-02 20:03:43,003 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 20:03:43,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:43,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:03:43,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:43,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,228 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 20:03:43,228 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:43,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509774435] [2021-05-02 20:03:43,229 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:43,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1726930710] [2021-05-02 20:03:43,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1726930710] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:03:43,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:03:43,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:03:43,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531184807] [2021-05-02 20:03:43,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:03:43,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:43,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:03:43,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:03:43,231 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:43,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:43,252 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-05-02 20:03:43,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:03:43,256 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 20:03:43,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:43,257 INFO L225 Difference]: With dead ends: 27 [2021-05-02 20:03:43,257 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 20:03:43,257 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 9.6ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:03:43,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 20:03:43,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 20:03:43,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:43,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-05-02 20:03:43,261 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 15 [2021-05-02 20:03:43,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:43,261 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-05-02 20:03:43,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:43,262 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-05-02 20:03:43,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 20:03:43,262 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:43,262 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:43,486 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 20:03:43,486 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:43,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:43,487 INFO L82 PathProgramCache]: Analyzing trace with hash 1208546121, now seen corresponding path program 1 times [2021-05-02 20:03:43,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:43,487 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223499417] [2021-05-02 20:03:43,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:43,498 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:43,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1468431514] [2021-05-02 20:03:43,499 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 20:03:43,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:43,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:03:43,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:43,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:43,722 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 20:03:43,722 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:43,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223499417] [2021-05-02 20:03:43,722 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:43,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468431514] [2021-05-02 20:03:43,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468431514] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:03:43,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:03:43,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 20:03:43,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773621670] [2021-05-02 20:03:43,723 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:03:43,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:43,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:03:43,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:03:43,725 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:43,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:43,778 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-05-02 20:03:43,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:03:43,778 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 20:03:43,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:43,779 INFO L225 Difference]: With dead ends: 33 [2021-05-02 20:03:43,779 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 20:03:43,779 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 33.6ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:03:43,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 20:03:43,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 20:03:43,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:43,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-02 20:03:43,784 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 15 [2021-05-02 20:03:43,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:43,785 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-02 20:03:43,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:43,785 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-02 20:03:43,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 20:03:43,786 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:43,786 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:43,988 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:43,989 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:43,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:43,989 INFO L82 PathProgramCache]: Analyzing trace with hash 1227316531, now seen corresponding path program 1 times [2021-05-02 20:03:43,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:43,990 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355446063] [2021-05-02 20:03:43,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:43,998 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:43,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [675927118] [2021-05-02 20:03:43,998 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 [2021-05-02 20:03:44,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:44,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:03:44,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:44,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,153 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:44,154 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:44,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355446063] [2021-05-02 20:03:44,154 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:44,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675927118] [2021-05-02 20:03:44,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675927118] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:44,155 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:44,155 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 20:03:44,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37446938] [2021-05-02 20:03:44,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:03:44,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:44,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:03:44,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:03:44,157 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:44,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:44,188 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-05-02 20:03:44,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:03:44,189 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 20:03:44,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:44,191 INFO L225 Difference]: With dead ends: 34 [2021-05-02 20:03:44,191 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 20:03:44,192 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 15.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:03:44,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 20:03:44,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 20:03:44,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:44,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-02 20:03:44,204 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 17 [2021-05-02 20:03:44,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:44,204 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-02 20:03:44,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:44,204 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-02 20:03:44,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 20:03:44,205 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:44,205 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:44,406 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:44,406 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:44,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:44,406 INFO L82 PathProgramCache]: Analyzing trace with hash 2051197196, now seen corresponding path program 1 times [2021-05-02 20:03:44,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:44,407 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049633911] [2021-05-02 20:03:44,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:44,421 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:44,421 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1223191325] [2021-05-02 20:03:44,421 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 20:03:44,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:44,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:03:44,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:44,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:44,597 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:44,597 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:44,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049633911] [2021-05-02 20:03:44,597 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:44,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223191325] [2021-05-02 20:03:44,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223191325] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:44,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:44,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:03:44,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729288627] [2021-05-02 20:03:44,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:03:44,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:44,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:03:44,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:03:44,601 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:44,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:44,638 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-05-02 20:03:44,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 20:03:44,639 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 20:03:44,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:44,640 INFO L225 Difference]: With dead ends: 39 [2021-05-02 20:03:44,640 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 20:03:44,640 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 19.5ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:03:44,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 20:03:44,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-02 20:03:44,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 30 states have internal predecessors, (38), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:44,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-05-02 20:03:44,645 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 18 [2021-05-02 20:03:44,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:44,645 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-05-02 20:03:44,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:44,646 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-05-02 20:03:44,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 20:03:44,646 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:44,646 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:44,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:44,861 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:44,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:44,862 INFO L82 PathProgramCache]: Analyzing trace with hash 2052329254, now seen corresponding path program 1 times [2021-05-02 20:03:44,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:44,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392810593] [2021-05-02 20:03:44,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:44,869 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:44,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [99278199] [2021-05-02 20:03:44,869 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 [2021-05-02 20:03:44,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:44,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:03:44,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:45,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,056 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:45,056 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:45,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392810593] [2021-05-02 20:03:45,056 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:45,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99278199] [2021-05-02 20:03:45,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99278199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:45,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:45,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:03:45,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990411778] [2021-05-02 20:03:45,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:03:45,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:45,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:03:45,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:03:45,060 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:45,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:45,142 INFO L93 Difference]: Finished difference Result 50 states and 61 transitions. [2021-05-02 20:03:45,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:03:45,144 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 20:03:45,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:45,145 INFO L225 Difference]: With dead ends: 50 [2021-05-02 20:03:45,145 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 20:03:45,146 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 30.3ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:03:45,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 20:03:45,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-05-02 20:03:45,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 36 states have internal predecessors, (44), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:03:45,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-05-02 20:03:45,156 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 18 [2021-05-02 20:03:45,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:45,157 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-05-02 20:03:45,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:03:45,157 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-05-02 20:03:45,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 20:03:45,164 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:45,164 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:45,364 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 20:03:45,365 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:45,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:45,366 INFO L82 PathProgramCache]: Analyzing trace with hash 462666167, now seen corresponding path program 1 times [2021-05-02 20:03:45,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:45,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483064528] [2021-05-02 20:03:45,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:45,382 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:45,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1922686267] [2021-05-02 20:03:45,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:03:45,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:45,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 20:03:45,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:45,489 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:45,490 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:45,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483064528] [2021-05-02 20:03:45,490 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:45,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922686267] [2021-05-02 20:03:45,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922686267] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:03:45,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:03:45,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:03:45,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764107533] [2021-05-02 20:03:45,491 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:03:45,491 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:45,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:03:45,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:03:45,492 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:45,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:45,505 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-05-02 20:03:45,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:03:45,505 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2021-05-02 20:03:45,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:45,506 INFO L225 Difference]: With dead ends: 43 [2021-05-02 20:03:45,506 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 20:03:45,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:03:45,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 20:03:45,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 20:03:45,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:45,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-05-02 20:03:45,509 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 24 [2021-05-02 20:03:45,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:45,510 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-05-02 20:03:45,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:45,510 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-05-02 20:03:45,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 20:03:45,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:45,511 INFO L523 BasicCegarLoop]: trace histogram [2, 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 20:03:45,733 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:45,734 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:45,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:45,734 INFO L82 PathProgramCache]: Analyzing trace with hash -269721504, now seen corresponding path program 1 times [2021-05-02 20:03:45,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:45,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599244703] [2021-05-02 20:03:45,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:45,741 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:45,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [820426164] [2021-05-02 20:03:45,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2021-05-02 20:03:45,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:45,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:03:45,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:45,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:45,903 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:45,904 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:45,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599244703] [2021-05-02 20:03:45,904 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:45,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820426164] [2021-05-02 20:03:45,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820426164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:45,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:45,904 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:03:45,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851608782] [2021-05-02 20:03:45,905 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:03:45,905 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:45,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:03:45,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:03:45,906 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:45,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:45,950 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2021-05-02 20:03:45,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:03:45,951 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 20:03:45,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:45,952 INFO L225 Difference]: With dead ends: 53 [2021-05-02 20:03:45,952 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 20:03:45,952 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 25.2ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:03:45,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 20:03:45,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2021-05-02 20:03:45,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 36 states have (on average 1.25) internal successors, (45), 37 states have internal predecessors, (45), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:03:45,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-05-02 20:03:45,966 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 27 [2021-05-02 20:03:45,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:45,966 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-05-02 20:03:45,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:45,967 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-05-02 20:03:45,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 20:03:45,967 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:45,967 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:46,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:46,185 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:46,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:46,186 INFO L82 PathProgramCache]: Analyzing trace with hash -268589446, now seen corresponding path program 1 times [2021-05-02 20:03:46,186 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:46,186 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621697185] [2021-05-02 20:03:46,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:46,192 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:46,192 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1791271691] [2021-05-02 20:03:46,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:46,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:46,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 20:03:46,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:46,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,457 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:46,458 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:46,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621697185] [2021-05-02 20:03:46,458 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:46,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791271691] [2021-05-02 20:03:46,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791271691] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:46,458 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:46,458 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:03:46,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712316506] [2021-05-02 20:03:46,459 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:03:46,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:46,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:03:46,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:03:46,460 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:46,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:46,614 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-05-02 20:03:46,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:03:46,615 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 20:03:46,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:46,617 INFO L225 Difference]: With dead ends: 62 [2021-05-02 20:03:46,617 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 20:03:46,618 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 112.4ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:03:46,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 20:03:46,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2021-05-02 20:03:46,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:03:46,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2021-05-02 20:03:46,627 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 27 [2021-05-02 20:03:46,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:46,628 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2021-05-02 20:03:46,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:46,628 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2021-05-02 20:03:46,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 20:03:46,630 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:46,631 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:46,831 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 20:03:46,832 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:46,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:46,832 INFO L82 PathProgramCache]: Analyzing trace with hash -1346351076, now seen corresponding path program 1 times [2021-05-02 20:03:46,832 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:46,832 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488727232] [2021-05-02 20:03:46,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:46,841 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:46,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [312192146] [2021-05-02 20:03:46,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:46,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:03:46,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:03:46,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:46,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:46,987 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:03:46,987 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:46,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488727232] [2021-05-02 20:03:46,988 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:46,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312192146] [2021-05-02 20:03:46,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312192146] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:46,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:46,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:03:46,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700701245] [2021-05-02 20:03:46,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:03:46,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:46,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:03:46,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:03:46,989 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:47,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:47,020 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2021-05-02 20:03:47,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:03:47,020 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-05-02 20:03:47,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:47,021 INFO L225 Difference]: With dead ends: 55 [2021-05-02 20:03:47,021 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 20:03:47,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 24.7ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:03:47,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 20:03:47,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 20:03:47,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 43 states have internal predecessors, (51), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:03:47,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2021-05-02 20:03:47,031 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 29 [2021-05-02 20:03:47,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:47,031 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2021-05-02 20:03:47,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:47,032 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2021-05-02 20:03:47,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 20:03:47,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:47,035 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:47,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:47,260 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:47,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:47,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1031563075, now seen corresponding path program 2 times [2021-05-02 20:03:47,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:47,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441885838] [2021-05-02 20:03:47,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:47,269 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:47,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [822233820] [2021-05-02 20:03:47,269 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:47,331 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:03:47,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:47,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 20:03:47,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:47,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,426 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:47,426 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:47,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441885838] [2021-05-02 20:03:47,426 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:47,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822233820] [2021-05-02 20:03:47,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822233820] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:47,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:47,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:03:47,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099792631] [2021-05-02 20:03:47,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:03:47,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:47,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:03:47,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:03:47,428 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:47,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:47,483 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2021-05-02 20:03:47,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:03:47,484 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-05-02 20:03:47,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:47,486 INFO L225 Difference]: With dead ends: 74 [2021-05-02 20:03:47,486 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 20:03:47,486 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 40.5ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:03:47,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 20:03:47,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2021-05-02 20:03:47,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 54 states have internal predecessors, (65), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:03:47,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 20:03:47,491 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 30 [2021-05-02 20:03:47,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:47,491 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 20:03:47,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:47,492 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 20:03:47,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 20:03:47,494 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:47,495 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:47,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:47,720 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:47,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:47,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1030431017, now seen corresponding path program 2 times [2021-05-02 20:03:47,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:47,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849354575] [2021-05-02 20:03:47,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:47,738 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:47,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [631610263] [2021-05-02 20:03:47,739 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:47,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:03:47,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:47,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 20:03:47,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:47,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:47,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:48,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:48,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:48,047 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:48,047 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:48,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849354575] [2021-05-02 20:03:48,048 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:48,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631610263] [2021-05-02 20:03:48,048 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631610263] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:48,048 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:48,048 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:03:48,048 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941750273] [2021-05-02 20:03:48,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:03:48,049 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:48,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:03:48,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:03:48,050 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:48,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:48,200 INFO L93 Difference]: Finished difference Result 93 states and 109 transitions. [2021-05-02 20:03:48,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:03:48,201 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-05-02 20:03:48,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:48,202 INFO L225 Difference]: With dead ends: 93 [2021-05-02 20:03:48,202 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 20:03:48,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 95.6ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 20:03:48,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 20:03:48,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2021-05-02 20:03:48,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 68 states have (on average 1.1911764705882353) internal successors, (81), 70 states have internal predecessors, (81), 11 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:03:48,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 101 transitions. [2021-05-02 20:03:48,212 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 101 transitions. Word has length 30 [2021-05-02 20:03:48,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:48,212 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 101 transitions. [2021-05-02 20:03:48,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:48,213 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 101 transitions. [2021-05-02 20:03:48,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 20:03:48,214 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:48,214 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:48,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 20:03:48,433 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:48,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:48,433 INFO L82 PathProgramCache]: Analyzing trace with hash 1111952806, now seen corresponding path program 3 times [2021-05-02 20:03:48,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:48,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582332152] [2021-05-02 20:03:48,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:48,467 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:48,468 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [678372505] [2021-05-02 20:03:48,468 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:49,372 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:03:49,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:49,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 20:03:49,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:49,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:49,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:49,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:49,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:49,569 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:03:49,569 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:49,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582332152] [2021-05-02 20:03:49,569 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:49,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678372505] [2021-05-02 20:03:49,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678372505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:49,570 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:49,570 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:03:49,570 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837481248] [2021-05-02 20:03:49,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:03:49,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:49,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:03:49,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:03:49,572 INFO L87 Difference]: Start difference. First operand 88 states and 101 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:49,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:49,616 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2021-05-02 20:03:49,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:03:49,616 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 36 [2021-05-02 20:03:49,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:49,619 INFO L225 Difference]: With dead ends: 71 [2021-05-02 20:03:49,620 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 20:03:49,620 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 65.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:03:49,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 20:03:49,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-05-02 20:03:49,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:03:49,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-05-02 20:03:49,624 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 36 [2021-05-02 20:03:49,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:49,624 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-05-02 20:03:49,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:49,624 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-05-02 20:03:49,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 20:03:49,624 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:49,625 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:49,830 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 20:03:49,830 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:49,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:49,831 INFO L82 PathProgramCache]: Analyzing trace with hash 954968015, now seen corresponding path program 3 times [2021-05-02 20:03:49,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:49,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999405130] [2021-05-02 20:03:49,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:49,844 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:49,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1666915490] [2021-05-02 20:03:49,845 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:50,294 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:03:50,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:50,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:03:50,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:50,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,430 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:50,431 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:50,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999405130] [2021-05-02 20:03:50,431 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:50,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666915490] [2021-05-02 20:03:50,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666915490] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:50,431 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:50,431 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 20:03:50,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865409427] [2021-05-02 20:03:50,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:03:50,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:50,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:03:50,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:03:50,432 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:50,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:50,487 INFO L93 Difference]: Finished difference Result 87 states and 101 transitions. [2021-05-02 20:03:50,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:03:50,488 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 20:03:50,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:50,489 INFO L225 Difference]: With dead ends: 87 [2021-05-02 20:03:50,489 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 20:03:50,489 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 43.8ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:03:50,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 20:03:50,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 67. [2021-05-02 20:03:50,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 53 states have internal predecessors, (62), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:03:50,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 76 transitions. [2021-05-02 20:03:50,492 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 76 transitions. Word has length 39 [2021-05-02 20:03:50,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:50,492 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 76 transitions. [2021-05-02 20:03:50,492 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:50,492 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 76 transitions. [2021-05-02 20:03:50,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 20:03:50,493 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:50,493 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:50,698 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 20:03:50,698 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:50,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:50,699 INFO L82 PathProgramCache]: Analyzing trace with hash 956100073, now seen corresponding path program 4 times [2021-05-02 20:03:50,699 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:50,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785709403] [2021-05-02 20:03:50,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:50,715 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:50,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [337667853] [2021-05-02 20:03:50,715 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:50,864 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:03:50,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:50,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 20:03:50,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:50,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:50,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,275 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:03:51,275 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:51,276 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785709403] [2021-05-02 20:03:51,276 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:51,276 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337667853] [2021-05-02 20:03:51,276 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337667853] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:51,276 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:51,276 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 20:03:51,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745402990] [2021-05-02 20:03:51,276 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 20:03:51,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:51,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 20:03:51,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 20:03:51,278 INFO L87 Difference]: Start difference. First operand 67 states and 76 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:51,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:51,579 INFO L93 Difference]: Finished difference Result 79 states and 90 transitions. [2021-05-02 20:03:51,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 20:03:51,580 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 20:03:51,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:51,581 INFO L225 Difference]: With dead ends: 79 [2021-05-02 20:03:51,581 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 20:03:51,581 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 280.8ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:03:51,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 20:03:51,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 65. [2021-05-02 20:03:51,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 50 states have (on average 1.18) internal successors, (59), 51 states have internal predecessors, (59), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:03:51,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2021-05-02 20:03:51,584 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 39 [2021-05-02 20:03:51,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:51,584 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2021-05-02 20:03:51,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:51,584 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2021-05-02 20:03:51,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 20:03:51,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:51,585 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:51,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:51,793 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:51,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:51,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1223907629, now seen corresponding path program 2 times [2021-05-02 20:03:51,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:51,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567883371] [2021-05-02 20:03:51,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:51,805 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:51,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [758681951] [2021-05-02 20:03:51,805 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:51,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:03:51,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:51,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:03:51,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:51,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:51,967 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 20:03:51,967 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:51,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567883371] [2021-05-02 20:03:51,967 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:51,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758681951] [2021-05-02 20:03:51,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758681951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:51,967 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:51,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:03:51,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111636375] [2021-05-02 20:03:51,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:03:51,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:51,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:03:51,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:03:51,973 INFO L87 Difference]: Start difference. First operand 65 states and 73 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:52,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:52,016 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2021-05-02 20:03:52,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:03:52,016 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2021-05-02 20:03:52,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:52,017 INFO L225 Difference]: With dead ends: 67 [2021-05-02 20:03:52,017 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 20:03:52,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 38.7ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:03:52,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 20:03:52,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-02 20:03:52,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 53 states have internal predecessors, (61), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:03:52,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2021-05-02 20:03:52,020 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 41 [2021-05-02 20:03:52,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:52,021 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2021-05-02 20:03:52,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:52,021 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2021-05-02 20:03:52,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 20:03:52,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:52,021 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:52,237 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 20:03:52,237 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:52,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:52,237 INFO L82 PathProgramCache]: Analyzing trace with hash 805846188, now seen corresponding path program 4 times [2021-05-02 20:03:52,237 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:52,237 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408675656] [2021-05-02 20:03:52,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:52,244 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:52,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1830234972] [2021-05-02 20:03:52,245 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:52,311 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:03:52,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:52,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 20:03:52,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:52,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:52,467 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:52,468 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:52,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408675656] [2021-05-02 20:03:52,468 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:52,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830234972] [2021-05-02 20:03:52,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830234972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:52,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:52,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:03:52,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14218790] [2021-05-02 20:03:52,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:03:52,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:52,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:03:52,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:03:52,470 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:52,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:52,536 INFO L93 Difference]: Finished difference Result 108 states and 124 transitions. [2021-05-02 20:03:52,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 20:03:52,537 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-05-02 20:03:52,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:52,538 INFO L225 Difference]: With dead ends: 108 [2021-05-02 20:03:52,538 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 20:03:52,538 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 60.1ms TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:03:52,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 20:03:52,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 88. [2021-05-02 20:03:52,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 69 states have (on average 1.173913043478261) internal successors, (81), 70 states have internal predecessors, (81), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:03:52,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 99 transitions. [2021-05-02 20:03:52,542 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 99 transitions. Word has length 42 [2021-05-02 20:03:52,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:52,542 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 99 transitions. [2021-05-02 20:03:52,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:52,543 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 99 transitions. [2021-05-02 20:03:52,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 20:03:52,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:52,543 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:52,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 20:03:52,757 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:52,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:52,757 INFO L82 PathProgramCache]: Analyzing trace with hash 806978246, now seen corresponding path program 5 times [2021-05-02 20:03:52,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:52,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93566807] [2021-05-02 20:03:52,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:52,766 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:52,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1947117092] [2021-05-02 20:03:52,766 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:53,146 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 20:03:53,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:53,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 20:03:53,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:53,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:53,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:53,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:53,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:53,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:53,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:53,463 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 3 proven. 33 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:03:53,463 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:53,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93566807] [2021-05-02 20:03:53,464 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:53,464 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947117092] [2021-05-02 20:03:53,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1947117092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:53,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:53,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:03:53,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012908545] [2021-05-02 20:03:53,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:03:53,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:53,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:03:53,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:03:53,467 INFO L87 Difference]: Start difference. First operand 88 states and 99 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:53,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:53,791 INFO L93 Difference]: Finished difference Result 129 states and 148 transitions. [2021-05-02 20:03:53,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:03:53,792 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-05-02 20:03:53,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:53,793 INFO L225 Difference]: With dead ends: 129 [2021-05-02 20:03:53,793 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 20:03:53,794 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 214.7ms TimeCoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-02 20:03:53,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 20:03:53,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 97. [2021-05-02 20:03:53,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1710526315789473) internal successors, (89), 77 states have internal predecessors, (89), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:03:53,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 109 transitions. [2021-05-02 20:03:53,802 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 109 transitions. Word has length 42 [2021-05-02 20:03:53,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:53,802 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 109 transitions. [2021-05-02 20:03:53,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:53,803 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 109 transitions. [2021-05-02 20:03:53,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 20:03:53,803 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:53,803 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:54,009 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:54,009 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:54,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:54,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1498904688, now seen corresponding path program 3 times [2021-05-02 20:03:54,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:54,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007987296] [2021-05-02 20:03:54,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:54,018 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:54,018 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [529879112] [2021-05-02 20:03:54,018 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:56,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:03:56,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:56,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 20:03:56,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:56,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,216 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 20:03:56,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:56,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007987296] [2021-05-02 20:03:56,217 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:56,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529879112] [2021-05-02 20:03:56,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529879112] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:03:56,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:03:56,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:03:56,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132977475] [2021-05-02 20:03:56,218 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:03:56,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:56,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:03:56,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:03:56,219 INFO L87 Difference]: Start difference. First operand 97 states and 109 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:56,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:56,239 INFO L93 Difference]: Finished difference Result 99 states and 110 transitions. [2021-05-02 20:03:56,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:03:56,239 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 44 [2021-05-02 20:03:56,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:56,240 INFO L225 Difference]: With dead ends: 99 [2021-05-02 20:03:56,240 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 20:03:56,240 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.5ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:03:56,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 20:03:56,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-05-02 20:03:56,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 77 states have internal predecessors, (88), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:03:56,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 108 transitions. [2021-05-02 20:03:56,244 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 108 transitions. Word has length 44 [2021-05-02 20:03:56,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:56,245 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 108 transitions. [2021-05-02 20:03:56,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:03:56,245 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 108 transitions. [2021-05-02 20:03:56,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 20:03:56,245 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:56,245 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:56,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:56,452 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:56,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:56,453 INFO L82 PathProgramCache]: Analyzing trace with hash -686317905, now seen corresponding path program 5 times [2021-05-02 20:03:56,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:56,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096951176] [2021-05-02 20:03:56,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:56,467 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:56,467 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [472568870] [2021-05-02 20:03:56,467 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:56,575 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 20:03:56,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:03:56,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 20:03:56,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:03:56,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:03:56,731 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 4 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:03:56,731 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:03:56,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096951176] [2021-05-02 20:03:56,731 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:03:56,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472568870] [2021-05-02 20:03:56,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472568870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:03:56,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:03:56,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:03:56,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751619553] [2021-05-02 20:03:56,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:03:56,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:03:56,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:03:56,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:03:56,733 INFO L87 Difference]: Start difference. First operand 97 states and 108 transitions. Second operand has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:56,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:03:56,830 INFO L93 Difference]: Finished difference Result 149 states and 167 transitions. [2021-05-02 20:03:56,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:03:56,831 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-05-02 20:03:56,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:03:56,832 INFO L225 Difference]: With dead ends: 149 [2021-05-02 20:03:56,832 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 20:03:56,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 75.2ms TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:03:56,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 20:03:56,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 127. [2021-05-02 20:03:56,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 99 states have (on average 1.1717171717171717) internal successors, (116), 101 states have internal predecessors, (116), 15 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 20:03:56,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 143 transitions. [2021-05-02 20:03:56,837 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 143 transitions. Word has length 45 [2021-05-02 20:03:56,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:03:56,837 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 143 transitions. [2021-05-02 20:03:56,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:03:56,837 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 143 transitions. [2021-05-02 20:03:56,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 20:03:56,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:03:56,838 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:03:57,042 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:03:57,042 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:03:57,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:03:57,043 INFO L82 PathProgramCache]: Analyzing trace with hash -685185847, now seen corresponding path program 6 times [2021-05-02 20:03:57,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:03:57,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365678913] [2021-05-02 20:03:57,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:03:57,056 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:03:57,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1359330847] [2021-05-02 20:03:57,056 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true