/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/fermat1-ll_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 20:34:10,310 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 20:34:10,312 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 20:34:10,340 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 20:34:10,340 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 20:34:10,342 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 20:34:10,344 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 20:34:10,350 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 20:34:10,352 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 20:34:10,355 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 20:34:10,356 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 20:34:10,357 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 20:34:10,357 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 20:34:10,358 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 20:34:10,359 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 20:34:10,360 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 20:34:10,362 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 20:34:10,363 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 20:34:10,365 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 20:34:10,370 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 20:34:10,372 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 20:34:10,373 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 20:34:10,373 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 20:34:10,375 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 20:34:10,379 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 20:34:10,379 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 20:34:10,380 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 20:34:10,382 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 20:34:10,382 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 20:34:10,383 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 20:34:10,383 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 20:34:10,384 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 20:34:10,385 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 20:34:10,386 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 20:34:10,386 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 20:34:10,386 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 20:34:10,387 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 20:34:10,387 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 20:34:10,394 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 20:34:10,395 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 20:34:10,395 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 20:34:10,396 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 20:34:10,403 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 20:34:10,403 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 20:34:10,404 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 20:34:10,404 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 20:34:10,404 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 20:34:10,404 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 20:34:10,404 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 20:34:10,405 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 20:34:10,405 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 20:34:10,405 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 20:34:10,405 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 20:34:10,405 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 20:34:10,405 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 20:34:10,405 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 20:34:10,406 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 20:34:10,406 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 20:34:10,406 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 20:34:10,406 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 20:34:10,406 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 20:34:10,406 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 20:34:10,406 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 20:34:10,407 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 20:34:10,407 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 20:34:10,649 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 20:34:10,666 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 20:34:10,667 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 20:34:10,668 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 20:34:10,669 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 20:34:10,669 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/fermat1-ll_unwindbound10.c [2021-05-02 20:34:10,707 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ab970f6f5/622e79cbb61843dfb6b0f282d7f42d74/FLAGf1caa1cdc [2021-05-02 20:34:11,130 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 20:34:11,130 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/fermat1-ll_unwindbound10.c [2021-05-02 20:34:11,135 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ab970f6f5/622e79cbb61843dfb6b0f282d7f42d74/FLAGf1caa1cdc [2021-05-02 20:34:11,149 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ab970f6f5/622e79cbb61843dfb6b0f282d7f42d74 [2021-05-02 20:34:11,150 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 20:34:11,152 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 20:34:11,154 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 20:34:11,154 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 20:34:11,157 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 20:34:11,157 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,158 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68eac4cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11, skipping insertion in model container [2021-05-02 20:34:11,158 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,162 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 20:34:11,173 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 20:34:11,289 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/fermat1-ll_unwindbound10.c[535,548] [2021-05-02 20:34:11,321 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:34:11,327 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 20:34:11,368 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/fermat1-ll_unwindbound10.c[535,548] [2021-05-02 20:34:11,373 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:34:11,383 INFO L208 MainTranslator]: Completed translation [2021-05-02 20:34:11,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11 WrapperNode [2021-05-02 20:34:11,383 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 20:34:11,384 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 20:34:11,384 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 20:34:11,384 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 20:34:11,398 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,399 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,413 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,414 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,424 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,427 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,427 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,428 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 20:34:11,429 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 20:34:11,429 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 20:34:11,429 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 20:34:11,430 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11" (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 20:34:11,474 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 20:34:11,474 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 20:34:11,474 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 20:34:11,474 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 20:34:11,475 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 20:34:11,475 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 20:34:11,475 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 20:34:11,476 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 20:34:11,476 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 20:34:11,476 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 20:34:11,476 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 20:34:11,701 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 20:34:11,701 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 20:34:11,702 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:34:11 BoogieIcfgContainer [2021-05-02 20:34:11,702 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 20:34:11,702 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 20:34:11,703 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 20:34:11,703 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 20:34:11,705 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:34:11" (1/1) ... [2021-05-02 20:34:11,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:34:11 BasicIcfg [2021-05-02 20:34:11,716 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 20:34:11,717 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 20:34:11,717 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 20:34:11,719 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 20:34:11,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 08:34:11" (1/4) ... [2021-05-02 20:34:11,720 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2cf9603c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:34:11, skipping insertion in model container [2021-05-02 20:34:11,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:34:11" (2/4) ... [2021-05-02 20:34:11,720 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2cf9603c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:34:11, skipping insertion in model container [2021-05-02 20:34:11,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:34:11" (3/4) ... [2021-05-02 20:34:11,720 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2cf9603c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 08:34:11, skipping insertion in model container [2021-05-02 20:34:11,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:34:11" (4/4) ... [2021-05-02 20:34:11,721 INFO L111 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound10.cJordan [2021-05-02 20:34:11,724 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 20:34:11,728 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 20:34:11,737 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 20:34:11,748 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 20:34:11,748 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 20:34:11,748 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 20:34:11,749 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 20:34:11,749 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 20:34:11,749 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 20:34:11,749 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 20:34:11,749 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 20:34:11,757 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:34:11,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 20:34:11,761 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:11,761 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:34:11,762 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:11,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:11,765 INFO L82 PathProgramCache]: Analyzing trace with hash -758992103, now seen corresponding path program 1 times [2021-05-02 20:34:11,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:11,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556087760] [2021-05-02 20:34:11,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:11,866 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:11,867 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [572551201] [2021-05-02 20:34:11,867 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 20:34:11,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:11,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 1 conjunts are in the unsatisfiable core [2021-05-02 20:34:11,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:12,028 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 20:34:12,028 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:34:12,028 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556087760] [2021-05-02 20:34:12,029 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:34:12,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572551201] [2021-05-02 20:34:12,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572551201] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:34:12,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:34:12,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-05-02 20:34:12,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083854126] [2021-05-02 20:34:12,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-05-02 20:34:12,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:34:12,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-05-02 20:34:12,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 20:34:12,050 INFO L87 Difference]: Start difference. First operand has 37 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:34:12,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:34:12,060 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2021-05-02 20:34:12,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-05-02 20:34:12,061 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-02 20:34:12,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:34:12,066 INFO L225 Difference]: With dead ends: 37 [2021-05-02 20:34:12,066 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 20:34:12,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 20:34:12,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 20:34:12,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 20:34:12,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:34:12,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2021-05-02 20:34:12,089 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 22 [2021-05-02 20:34:12,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:34:12,090 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2021-05-02 20:34:12,090 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:34:12,090 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2021-05-02 20:34:12,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 20:34:12,091 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:12,091 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:34:12,300 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-05-02 20:34:12,301 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:12,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:12,302 INFO L82 PathProgramCache]: Analyzing trace with hash -713449777, now seen corresponding path program 1 times [2021-05-02 20:34:12,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:12,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695309480] [2021-05-02 20:34:12,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:12,322 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:12,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1636937749] [2021-05-02 20:34:12,322 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 20:34:12,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:12,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 20:34:12,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:12,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:12,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:12,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:12,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:12,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:12,460 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:34:12,461 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:34:12,461 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695309480] [2021-05-02 20:34:12,461 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:34:12,461 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636937749] [2021-05-02 20:34:12,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636937749] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:34:12,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:34:12,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 20:34:12,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131071270] [2021-05-02 20:34:12,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 20:34:12,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:34:12,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 20:34:12,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 20:34:12,463 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:34:12,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:34:12,488 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2021-05-02 20:34:12,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 20:34:12,489 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 20:34:12,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:34:12,490 INFO L225 Difference]: With dead ends: 34 [2021-05-02 20:34:12,490 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 20:34:12,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 20:34:12,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 20:34:12,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 20:34:12,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 23 states have internal predecessors, (29), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:34:12,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2021-05-02 20:34:12,495 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 23 [2021-05-02 20:34:12,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:34:12,496 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2021-05-02 20:34:12,496 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:34:12,496 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2021-05-02 20:34:12,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 20:34:12,497 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:12,497 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:34:12,709 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:34:12,709 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:12,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:12,710 INFO L82 PathProgramCache]: Analyzing trace with hash -712377301, now seen corresponding path program 1 times [2021-05-02 20:34:12,710 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:12,710 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266145525] [2021-05-02 20:34:12,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:12,726 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:12,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1796816620] [2021-05-02 20:34:12,727 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 20:34:12,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:12,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 20:34:12,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:12,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:12,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:12,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:12,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:12,973 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:34:12,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:34:12,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266145525] [2021-05-02 20:34:12,974 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:34:12,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796816620] [2021-05-02 20:34:12,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796816620] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:34:12,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:34:12,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:34:12,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570248346] [2021-05-02 20:34:12,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:34:12,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:34:12,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:34:12,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:34:12,976 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:34:21,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:34:21,138 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2021-05-02 20:34:21,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:34:21,138 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 20:34:21,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:34:21,139 INFO L225 Difference]: With dead ends: 51 [2021-05-02 20:34:21,139 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 20:34:21,140 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 69.4ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:34:21,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 20:34:21,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-05-02 20:34:21,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 35 states have internal predecessors, (47), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:34:21,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 67 transitions. [2021-05-02 20:34:21,145 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 67 transitions. Word has length 23 [2021-05-02 20:34:21,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:34:21,146 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 67 transitions. [2021-05-02 20:34:21,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:34:21,146 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 67 transitions. [2021-05-02 20:34:21,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 20:34:21,146 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:21,146 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, 1, 1] [2021-05-02 20:34:21,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:34:21,357 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:21,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:21,357 INFO L82 PathProgramCache]: Analyzing trace with hash 740915101, now seen corresponding path program 1 times [2021-05-02 20:34:21,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:21,358 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838854769] [2021-05-02 20:34:21,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:21,366 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:21,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [399180857] [2021-05-02 20:34:21,366 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 20:34:21,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:21,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 20:34:21,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:21,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:21,655 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:34:21,656 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:34:21,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838854769] [2021-05-02 20:34:21,656 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:34:21,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399180857] [2021-05-02 20:34:21,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399180857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:34:21,656 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:34:21,656 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:34:21,656 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505083943] [2021-05-02 20:34:21,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:34:21,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:34:21,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:34:21,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:34:21,657 INFO L87 Difference]: Start difference. First operand 50 states and 67 transitions. Second operand has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 20:34:27,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:34:27,873 INFO L93 Difference]: Finished difference Result 70 states and 92 transitions. [2021-05-02 20:34:27,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:34:27,874 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-05-02 20:34:27,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:34:27,875 INFO L225 Difference]: With dead ends: 70 [2021-05-02 20:34:27,876 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 20:34:27,876 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 140.8ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:34:27,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 20:34:27,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 63. [2021-05-02 20:34:27,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 43 states have (on average 1.3255813953488371) internal successors, (57), 47 states have internal predecessors, (57), 14 states have call successors, (14), 6 states have call predecessors, (14), 5 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 20:34:27,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 83 transitions. [2021-05-02 20:34:27,881 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 83 transitions. Word has length 29 [2021-05-02 20:34:27,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:34:27,882 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 83 transitions. [2021-05-02 20:34:27,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 20:34:27,882 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 83 transitions. [2021-05-02 20:34:27,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 20:34:27,882 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:27,882 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:34:28,096 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:34:28,099 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:28,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:28,100 INFO L82 PathProgramCache]: Analyzing trace with hash -1345250901, now seen corresponding path program 1 times [2021-05-02 20:34:28,100 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:28,100 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360579644] [2021-05-02 20:34:28,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:28,110 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:28,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [540945124] [2021-05-02 20:34:28,110 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 20:34:28,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:28,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:34:28,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:28,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,217 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:34:28,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:34:28,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360579644] [2021-05-02 20:34:28,217 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:34:28,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540945124] [2021-05-02 20:34:28,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540945124] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:34:28,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:34:28,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:34:28,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766730683] [2021-05-02 20:34:28,218 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:34:28,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:34:28,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:34:28,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:34:28,218 INFO L87 Difference]: Start difference. First operand 63 states and 83 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:34:28,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:34:28,239 INFO L93 Difference]: Finished difference Result 71 states and 91 transitions. [2021-05-02 20:34:28,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:34:28,240 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 35 [2021-05-02 20:34:28,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:34:28,241 INFO L225 Difference]: With dead ends: 71 [2021-05-02 20:34:28,241 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 20:34:28,241 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.3ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:34:28,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 20:34:28,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 20:34:28,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 49 states have (on average 1.2857142857142858) internal successors, (63), 53 states have internal predecessors, (63), 15 states have call successors, (15), 7 states have call predecessors, (15), 6 states have return successors, (13), 10 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 20:34:28,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 91 transitions. [2021-05-02 20:34:28,246 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 91 transitions. Word has length 35 [2021-05-02 20:34:28,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:34:28,246 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 91 transitions. [2021-05-02 20:34:28,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:34:28,246 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 91 transitions. [2021-05-02 20:34:28,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 20:34:28,247 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:28,247 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:34:28,460 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:34:28,461 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:28,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:28,461 INFO L82 PathProgramCache]: Analyzing trace with hash -827702321, now seen corresponding path program 1 times [2021-05-02 20:34:28,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:28,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757164343] [2021-05-02 20:34:28,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:28,468 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:28,468 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [621256232] [2021-05-02 20:34:28,468 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 20:34:28,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:28,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 20:34:28,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:28,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:28,781 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 20:34:28,781 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:34:28,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757164343] [2021-05-02 20:34:28,781 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:34:28,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621256232] [2021-05-02 20:34:28,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621256232] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:34:28,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:34:28,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 20:34:28,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170560950] [2021-05-02 20:34:28,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 20:34:28,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:34:28,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 20:34:28,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-05-02 20:34:28,783 INFO L87 Difference]: Start difference. First operand 71 states and 91 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 20:34:34,695 WARN L205 SmtUtils]: Spent 3.37 s on a formula simplification that was a NOOP. DAG size: 26 [2021-05-02 20:34:45,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:34:45,439 INFO L93 Difference]: Finished difference Result 102 states and 134 transitions. [2021-05-02 20:34:45,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 20:34:45,439 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 39 [2021-05-02 20:34:45,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:34:45,440 INFO L225 Difference]: With dead ends: 102 [2021-05-02 20:34:45,440 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 20:34:45,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 3554.4ms TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-02 20:34:45,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 20:34:45,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2021-05-02 20:34:45,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 70 states have (on average 1.3142857142857143) internal successors, (92), 77 states have internal predecessors, (92), 21 states have call successors, (21), 9 states have call predecessors, (21), 8 states have return successors, (19), 13 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 20:34:45,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 132 transitions. [2021-05-02 20:34:45,448 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 132 transitions. Word has length 39 [2021-05-02 20:34:45,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:34:45,448 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 132 transitions. [2021-05-02 20:34:45,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 20:34:45,448 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 132 transitions. [2021-05-02 20:34:45,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 20:34:45,449 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:45,449 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:34:45,664 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:34:45,664 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:45,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:45,665 INFO L82 PathProgramCache]: Analyzing trace with hash -516919762, now seen corresponding path program 1 times [2021-05-02 20:34:45,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:45,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388216531] [2021-05-02 20:34:45,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:45,677 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:45,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [285129357] [2021-05-02 20:34:45,677 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 20:34:45,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:45,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:34:45,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:45,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:45,818 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:34:45,818 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:34:45,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388216531] [2021-05-02 20:34:45,819 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:34:45,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [285129357] [2021-05-02 20:34:45,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [285129357] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:34:45,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:34:45,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:34:45,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116942068] [2021-05-02 20:34:45,820 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:34:45,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:34:45,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:34:45,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:34:45,821 INFO L87 Difference]: Start difference. First operand 100 states and 132 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:34:45,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:34:45,851 INFO L93 Difference]: Finished difference Result 109 states and 142 transitions. [2021-05-02 20:34:45,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:34:45,852 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 41 [2021-05-02 20:34:45,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:34:45,853 INFO L225 Difference]: With dead ends: 109 [2021-05-02 20:34:45,853 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 20:34:45,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.3ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:34:45,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 20:34:45,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2021-05-02 20:34:45,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 76 states have (on average 1.3026315789473684) internal successors, (99), 83 states have internal predecessors, (99), 22 states have call successors, (22), 10 states have call predecessors, (22), 9 states have return successors, (20), 14 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-02 20:34:45,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 141 transitions. [2021-05-02 20:34:45,859 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 141 transitions. Word has length 41 [2021-05-02 20:34:45,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:34:45,860 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 141 transitions. [2021-05-02 20:34:45,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:34:45,860 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 141 transitions. [2021-05-02 20:34:45,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 20:34:45,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:45,861 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:34:46,069 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:34:46,069 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:46,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:46,069 INFO L82 PathProgramCache]: Analyzing trace with hash -61650990, now seen corresponding path program 1 times [2021-05-02 20:34:46,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:46,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636897331] [2021-05-02 20:34:46,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:46,076 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:46,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [678642830] [2021-05-02 20:34:46,077 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 20:34:46,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:46,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:34:46,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:46,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,237 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:34:46,237 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:34:46,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636897331] [2021-05-02 20:34:46,237 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:34:46,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678642830] [2021-05-02 20:34:46,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678642830] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:34:46,238 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:34:46,238 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:34:46,238 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512148066] [2021-05-02 20:34:46,238 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:34:46,238 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:34:46,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:34:46,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:34:46,239 INFO L87 Difference]: Start difference. First operand 108 states and 141 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:34:46,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:34:46,284 INFO L93 Difference]: Finished difference Result 110 states and 143 transitions. [2021-05-02 20:34:46,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 20:34:46,284 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 43 [2021-05-02 20:34:46,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:34:46,285 INFO L225 Difference]: With dead ends: 110 [2021-05-02 20:34:46,285 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 20:34:46,285 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 15.9ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:34:46,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 20:34:46,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2021-05-02 20:34:46,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 78 states have (on average 1.294871794871795) internal successors, (101), 85 states have internal predecessors, (101), 22 states have call successors, (22), 10 states have call predecessors, (22), 9 states have return successors, (20), 14 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-02 20:34:46,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 143 transitions. [2021-05-02 20:34:46,292 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 143 transitions. Word has length 43 [2021-05-02 20:34:46,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:34:46,292 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 143 transitions. [2021-05-02 20:34:46,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:34:46,293 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 143 transitions. [2021-05-02 20:34:46,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 20:34:46,294 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:46,294 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:34:46,507 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-05-02 20:34:46,507 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:46,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:46,507 INFO L82 PathProgramCache]: Analyzing trace with hash 468355249, now seen corresponding path program 1 times [2021-05-02 20:34:46,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:46,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057188651] [2021-05-02 20:34:46,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:46,514 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:46,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [790572293] [2021-05-02 20:34:46,514 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 20:34:46,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:46,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 20:34:46,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:46,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,641 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 20:34:46,641 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:34:46,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057188651] [2021-05-02 20:34:46,641 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:34:46,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790572293] [2021-05-02 20:34:46,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790572293] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:34:46,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:34:46,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 20:34:46,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697650144] [2021-05-02 20:34:46,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 20:34:46,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:34:46,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 20:34:46,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-02 20:34:46,643 INFO L87 Difference]: Start difference. First operand 110 states and 143 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 20:34:46,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:34:46,671 INFO L93 Difference]: Finished difference Result 132 states and 178 transitions. [2021-05-02 20:34:46,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 20:34:46,671 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2021-05-02 20:34:46,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:34:46,673 INFO L225 Difference]: With dead ends: 132 [2021-05-02 20:34:46,673 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 20:34:46,674 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.6ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-02 20:34:46,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 20:34:46,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 83. [2021-05-02 20:34:46,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 58 states have (on average 1.2413793103448276) internal successors, (72), 62 states have internal predecessors, (72), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 20:34:46,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 104 transitions. [2021-05-02 20:34:46,692 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 104 transitions. Word has length 47 [2021-05-02 20:34:46,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:34:46,692 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 104 transitions. [2021-05-02 20:34:46,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 20:34:46,692 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 104 transitions. [2021-05-02 20:34:46,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 20:34:46,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:34:46,693 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:34:46,893 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:34:46,894 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:34:46,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:34:46,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1922781660, now seen corresponding path program 1 times [2021-05-02 20:34:46,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:34:46,895 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305857027] [2021-05-02 20:34:46,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:34:46,900 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:34:46,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1697781353] [2021-05-02 20:34:46,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:34:46,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:34:46,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 20:34:46,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:34:46,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:46,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:47,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:47,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:47,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:47,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:47,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:34:47,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:35:02,997 WARN L205 SmtUtils]: Spent 13.87 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 20:35:03,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:35:03,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:35:17,404 WARN L205 SmtUtils]: Spent 6.03 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 20:35:17,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:35:17,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:35:17,469 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 7 refuted. 3 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 20:35:17,469 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:35:17,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305857027] [2021-05-02 20:35:17,469 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:35:17,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697781353] [2021-05-02 20:35:17,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1697781353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:35:17,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:35:17,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 20:35:17,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256604820] [2021-05-02 20:35:17,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 20:35:17,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:35:17,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 20:35:17,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=104, Unknown=5, NotChecked=0, Total=132 [2021-05-02 20:35:17,471 INFO L87 Difference]: Start difference. First operand 83 states and 104 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 20:35:52,083 WARN L205 SmtUtils]: Spent 8.07 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 20:36:29,363 WARN L205 SmtUtils]: Spent 10.97 s on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 20:37:26,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:37:26,687 INFO L93 Difference]: Finished difference Result 124 states and 162 transitions. [2021-05-02 20:37:26,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 20:37:26,687 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 47 [2021-05-02 20:37:26,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:37:26,688 INFO L225 Difference]: With dead ends: 124 [2021-05-02 20:37:26,688 INFO L226 Difference]: Without dead ends: 124 [2021-05-02 20:37:26,689 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 71906.7ms TimeCoverageRelationStatistics Valid=52, Invalid=239, Unknown=15, NotChecked=0, Total=306 [2021-05-02 20:37:26,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-02 20:37:26,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2021-05-02 20:37:26,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 86 states have (on average 1.2790697674418605) internal successors, (110), 93 states have internal predecessors, (110), 26 states have call successors, (26), 10 states have call predecessors, (26), 9 states have return successors, (24), 18 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 20:37:26,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 160 transitions. [2021-05-02 20:37:26,693 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 160 transitions. Word has length 47 [2021-05-02 20:37:26,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:37:26,693 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 160 transitions. [2021-05-02 20:37:26,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 20:37:26,693 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 160 transitions. [2021-05-02 20:37:26,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 20:37:26,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:37:26,694 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:37:26,909 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:37:26,909 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:37:26,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:37:26,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1802828170, now seen corresponding path program 2 times [2021-05-02 20:37:26,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:37:26,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115800973] [2021-05-02 20:37:26,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:37:26,916 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:37:26,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [924798768] [2021-05-02 20:37:26,916 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 20:37:26,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:37:26,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:37:26,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 20:37:26,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:37:26,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:26,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:26,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:26,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:37:27,428 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 20:37:27,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:37:27,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115800973] [2021-05-02 20:37:27,429 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:37:27,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924798768] [2021-05-02 20:37:27,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924798768] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:37:27,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:37:27,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 20:37:27,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440255000] [2021-05-02 20:37:27,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 20:37:27,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:37:27,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 20:37:27,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 20:37:27,430 INFO L87 Difference]: Start difference. First operand 122 states and 160 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:38:04,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:38:04,414 INFO L93 Difference]: Finished difference Result 232 states and 328 transitions. [2021-05-02 20:38:04,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 20:38:04,414 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 47 [2021-05-02 20:38:04,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:38:04,416 INFO L225 Difference]: With dead ends: 232 [2021-05-02 20:38:04,416 INFO L226 Difference]: Without dead ends: 232 [2021-05-02 20:38:04,416 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 257.2ms TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-02 20:38:04,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-05-02 20:38:04,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 215. [2021-05-02 20:38:04,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 154 states have (on average 1.3571428571428572) internal successors, (209), 168 states have internal predecessors, (209), 49 states have call successors, (49), 12 states have call predecessors, (49), 11 states have return successors, (47), 34 states have call predecessors, (47), 47 states have call successors, (47) [2021-05-02 20:38:04,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 305 transitions. [2021-05-02 20:38:04,426 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 305 transitions. Word has length 47 [2021-05-02 20:38:04,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:38:04,427 INFO L480 AbstractCegarLoop]: Abstraction has 215 states and 305 transitions. [2021-05-02 20:38:04,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:38:04,427 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 305 transitions. [2021-05-02 20:38:04,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 20:38:04,427 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:38:04,427 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:38:04,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 20:38:04,635 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:38:04,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:38:04,635 INFO L82 PathProgramCache]: Analyzing trace with hash -763492839, now seen corresponding path program 1 times [2021-05-02 20:38:04,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:38:04,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567552584] [2021-05-02 20:38:04,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:38:04,640 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:38:04,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [567761506] [2021-05-02 20:38:04,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:38:04,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:38:04,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:38:04,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:38:04,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:04,792 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:38:04,792 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:38:04,792 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567552584] [2021-05-02 20:38:04,793 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:38:04,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567761506] [2021-05-02 20:38:04,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567761506] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:38:04,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:38:04,793 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:38:04,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182846105] [2021-05-02 20:38:04,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:38:04,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:38:04,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:38:04,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:38:04,794 INFO L87 Difference]: Start difference. First operand 215 states and 305 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:38:04,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:38:04,860 INFO L93 Difference]: Finished difference Result 220 states and 307 transitions. [2021-05-02 20:38:04,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:38:04,861 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 49 [2021-05-02 20:38:04,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:38:04,863 INFO L225 Difference]: With dead ends: 220 [2021-05-02 20:38:04,863 INFO L226 Difference]: Without dead ends: 220 [2021-05-02 20:38:04,863 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 23.6ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:38:04,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-05-02 20:38:04,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 219. [2021-05-02 20:38:04,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 158 states have (on average 1.3417721518987342) internal successors, (212), 170 states have internal predecessors, (212), 48 states have call successors, (48), 13 states have call predecessors, (48), 12 states have return successors, (46), 35 states have call predecessors, (46), 46 states have call successors, (46) [2021-05-02 20:38:04,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 306 transitions. [2021-05-02 20:38:04,874 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 306 transitions. Word has length 49 [2021-05-02 20:38:04,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:38:04,875 INFO L480 AbstractCegarLoop]: Abstraction has 219 states and 306 transitions. [2021-05-02 20:38:04,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:38:04,875 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 306 transitions. [2021-05-02 20:38:04,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 20:38:04,876 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:38:04,876 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:38:05,094 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:38:05,094 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:38:05,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:38:05,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1993056519, now seen corresponding path program 2 times [2021-05-02 20:38:05,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:38:05,095 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193631739] [2021-05-02 20:38:05,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:38:05,110 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:38:05,111 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1543623479] [2021-05-02 20:38:05,111 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 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 20:38:05,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:38:05,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:38:05,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:38:05,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:38:05,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,275 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:38:05,275 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:38:05,275 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193631739] [2021-05-02 20:38:05,275 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:38:05,275 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543623479] [2021-05-02 20:38:05,276 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543623479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:38:05,276 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:38:05,276 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:38:05,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883507526] [2021-05-02 20:38:05,276 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:38:05,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:38:05,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:38:05,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:38:05,277 INFO L87 Difference]: Start difference. First operand 219 states and 306 transitions. Second operand has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:38:05,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:38:05,349 INFO L93 Difference]: Finished difference Result 221 states and 308 transitions. [2021-05-02 20:38:05,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 20:38:05,350 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 51 [2021-05-02 20:38:05,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:38:05,351 INFO L225 Difference]: With dead ends: 221 [2021-05-02 20:38:05,351 INFO L226 Difference]: Without dead ends: 221 [2021-05-02 20:38:05,351 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 35.9ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:38:05,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-02 20:38:05,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 221. [2021-05-02 20:38:05,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 160 states have (on average 1.3375) internal successors, (214), 172 states have internal predecessors, (214), 48 states have call successors, (48), 13 states have call predecessors, (48), 12 states have return successors, (46), 35 states have call predecessors, (46), 46 states have call successors, (46) [2021-05-02 20:38:05,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 308 transitions. [2021-05-02 20:38:05,363 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 308 transitions. Word has length 51 [2021-05-02 20:38:05,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:38:05,363 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 308 transitions. [2021-05-02 20:38:05,363 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 6 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:38:05,363 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 308 transitions. [2021-05-02 20:38:05,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 20:38:05,364 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:38:05,364 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:38:05,565 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 20:38:05,565 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:38:05,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:38:05,565 INFO L82 PathProgramCache]: Analyzing trace with hash 2076394588, now seen corresponding path program 1 times [2021-05-02 20:38:05,566 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:38:05,566 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936979652] [2021-05-02 20:38:05,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:38:05,571 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:38:05,571 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [290547078] [2021-05-02 20:38:05,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:38:05,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:38:05,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 20:38:05,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:38:05,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:05,735 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:38:05,735 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:38:05,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936979652] [2021-05-02 20:38:05,735 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:38:05,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290547078] [2021-05-02 20:38:05,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290547078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:38:05,735 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:38:05,735 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:38:05,735 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990571129] [2021-05-02 20:38:05,736 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:38:05,736 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:38:05,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:38:05,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:38:05,736 INFO L87 Difference]: Start difference. First operand 221 states and 308 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 20:38:05,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:38:05,813 INFO L93 Difference]: Finished difference Result 242 states and 332 transitions. [2021-05-02 20:38:05,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 20:38:05,813 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 55 [2021-05-02 20:38:05,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:38:05,817 INFO L225 Difference]: With dead ends: 242 [2021-05-02 20:38:05,817 INFO L226 Difference]: Without dead ends: 242 [2021-05-02 20:38:05,818 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 29.5ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:38:05,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-05-02 20:38:05,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 237. [2021-05-02 20:38:05,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 172 states have (on average 1.3255813953488371) internal successors, (228), 184 states have internal predecessors, (228), 50 states have call successors, (50), 15 states have call predecessors, (50), 14 states have return successors, (48), 37 states have call predecessors, (48), 48 states have call successors, (48) [2021-05-02 20:38:05,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 326 transitions. [2021-05-02 20:38:05,826 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 326 transitions. Word has length 55 [2021-05-02 20:38:05,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:38:05,827 INFO L480 AbstractCegarLoop]: Abstraction has 237 states and 326 transitions. [2021-05-02 20:38:05,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 20:38:05,827 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 326 transitions. [2021-05-02 20:38:05,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 20:38:05,827 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:38:05,828 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:38:06,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:38:06,029 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:38:06,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:38:06,029 INFO L82 PathProgramCache]: Analyzing trace with hash -764146297, now seen corresponding path program 2 times [2021-05-02 20:38:06,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:38:06,029 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073547138] [2021-05-02 20:38:06,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:38:06,034 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:38:06,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1712270056] [2021-05-02 20:38:06,034 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 20:38:06,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:38:06,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:38:06,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 20:38:06,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:38:06,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:06,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:06,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:06,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:18,466 WARN L205 SmtUtils]: Spent 10.12 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 20:38:18,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:18,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:18,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:18,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:34,666 WARN L205 SmtUtils]: Spent 7.96 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 20:38:34,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:38:34,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:39:35,654 WARN L205 SmtUtils]: Spent 35.43 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 20:39:35,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:39:35,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:39:37,876 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 12 proven. 11 refuted. 10 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 20:39:37,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:39:37,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073547138] [2021-05-02 20:39:37,877 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:39:37,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712270056] [2021-05-02 20:39:37,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712270056] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:39:37,877 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:39:37,877 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 20:39:37,877 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670042758] [2021-05-02 20:39:37,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 20:39:37,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:39:37,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 20:39:37,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=120, Unknown=11, NotChecked=0, Total=156 [2021-05-02 20:39:37,878 INFO L87 Difference]: Start difference. First operand 237 states and 326 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 20:40:37,330 WARN L205 SmtUtils]: Spent 8.22 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 20:42:06,770 WARN L205 SmtUtils]: Spent 6.06 s on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 20:43:01,559 WARN L205 SmtUtils]: Spent 11.36 s on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 20:44:42,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:44:42,875 INFO L93 Difference]: Finished difference Result 248 states and 339 transitions. [2021-05-02 20:44:42,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 20:44:42,876 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7) Word has length 55 [2021-05-02 20:44:42,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:44:42,877 INFO L225 Difference]: With dead ends: 248 [2021-05-02 20:44:42,877 INFO L226 Difference]: Without dead ends: 248 [2021-05-02 20:44:42,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 165306.5ms TimeCoverageRelationStatistics Valid=58, Invalid=296, Unknown=26, NotChecked=0, Total=380 [2021-05-02 20:44:42,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-02 20:44:42,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 245. [2021-05-02 20:44:42,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 178 states have (on average 1.3202247191011236) internal successors, (235), 190 states have internal predecessors, (235), 51 states have call successors, (51), 16 states have call predecessors, (51), 15 states have return successors, (49), 38 states have call predecessors, (49), 49 states have call successors, (49) [2021-05-02 20:44:42,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 335 transitions. [2021-05-02 20:44:42,883 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 335 transitions. Word has length 55 [2021-05-02 20:44:42,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:44:42,883 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 335 transitions. [2021-05-02 20:44:42,883 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 20:44:42,884 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 335 transitions. [2021-05-02 20:44:42,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 20:44:42,884 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:44:42,884 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:44:43,097 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 20:44:43,097 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:44:43,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:44:43,098 INFO L82 PathProgramCache]: Analyzing trace with hash -314671741, now seen corresponding path program 1 times [2021-05-02 20:44:43,098 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:44:43,098 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487362581] [2021-05-02 20:44:43,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:44:43,104 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:44:43,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [207190987] [2021-05-02 20:44:43,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:44:43,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:44:43,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 20:44:43,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:44:43,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,251 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 20:44:43,251 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:44:43,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487362581] [2021-05-02 20:44:43,251 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:44:43,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207190987] [2021-05-02 20:44:43,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [207190987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:44:43,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:44:43,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2021-05-02 20:44:43,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505027448] [2021-05-02 20:44:43,252 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 20:44:43,252 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:44:43,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 20:44:43,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 20:44:43,252 INFO L87 Difference]: Start difference. First operand 245 states and 335 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 20:44:43,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:44:43,293 INFO L93 Difference]: Finished difference Result 319 states and 442 transitions. [2021-05-02 20:44:43,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:44:43,294 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 55 [2021-05-02 20:44:43,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:44:43,295 INFO L225 Difference]: With dead ends: 319 [2021-05-02 20:44:43,295 INFO L226 Difference]: Without dead ends: 312 [2021-05-02 20:44:43,295 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:44:43,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-05-02 20:44:43,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 299. [2021-05-02 20:44:43,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 220 states have (on average 1.3136363636363637) internal successors, (289), 232 states have internal predecessors, (289), 63 states have call successors, (63), 16 states have call predecessors, (63), 15 states have return successors, (61), 50 states have call predecessors, (61), 61 states have call successors, (61) [2021-05-02 20:44:43,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 413 transitions. [2021-05-02 20:44:43,307 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 413 transitions. Word has length 55 [2021-05-02 20:44:43,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:44:43,307 INFO L480 AbstractCegarLoop]: Abstraction has 299 states and 413 transitions. [2021-05-02 20:44:43,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 20:44:43,307 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 413 transitions. [2021-05-02 20:44:43,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 20:44:43,308 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:44:43,308 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 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 20:44:43,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 20:44:43,521 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:44:43,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:44:43,521 INFO L82 PathProgramCache]: Analyzing trace with hash 254685725, now seen corresponding path program 3 times [2021-05-02 20:44:43,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:44:43,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825300073] [2021-05-02 20:44:43,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:44:43,535 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:44:43,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1670694732] [2021-05-02 20:44:43,536 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 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 20:44:43,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:44:43,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:44:43,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 20:44:43,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:44:43,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:43,778 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-05-02 20:44:43,778 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:44:43,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825300073] [2021-05-02 20:44:43,779 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:44:43,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670694732] [2021-05-02 20:44:43,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670694732] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:44:43,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:44:43,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:44:43,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346603056] [2021-05-02 20:44:43,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:44:43,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:44:43,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:44:43,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:44:43,780 INFO L87 Difference]: Start difference. First operand 299 states and 413 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 20:44:50,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:44:50,879 INFO L93 Difference]: Finished difference Result 310 states and 427 transitions. [2021-05-02 20:44:50,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 20:44:50,879 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) Word has length 55 [2021-05-02 20:44:50,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:44:50,880 INFO L225 Difference]: With dead ends: 310 [2021-05-02 20:44:50,881 INFO L226 Difference]: Without dead ends: 310 [2021-05-02 20:44:50,881 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 52.3ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:44:50,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-05-02 20:44:50,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 309. [2021-05-02 20:44:50,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 227 states have (on average 1.3127753303964758) internal successors, (298), 241 states have internal predecessors, (298), 65 states have call successors, (65), 17 states have call predecessors, (65), 16 states have return successors, (63), 50 states have call predecessors, (63), 63 states have call successors, (63) [2021-05-02 20:44:50,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 426 transitions. [2021-05-02 20:44:50,900 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 426 transitions. Word has length 55 [2021-05-02 20:44:50,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:44:50,901 INFO L480 AbstractCegarLoop]: Abstraction has 309 states and 426 transitions. [2021-05-02 20:44:50,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 20:44:50,901 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 426 transitions. [2021-05-02 20:44:50,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 20:44:50,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:44:50,901 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:44:51,102 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 20:44:51,102 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:44:51,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:44:51,102 INFO L82 PathProgramCache]: Analyzing trace with hash -1625914620, now seen corresponding path program 2 times [2021-05-02 20:44:51,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:44:51,103 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240730434] [2021-05-02 20:44:51,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:44:51,106 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:44:51,106 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1994638500] [2021-05-02 20:44:51,106 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 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 20:44:51,142 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:44:51,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:44:51,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 20:44:51,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:44:51,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,288 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:44:51,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:44:51,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240730434] [2021-05-02 20:44:51,289 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:44:51,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994638500] [2021-05-02 20:44:51,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994638500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:44:51,289 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:44:51,289 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:44:51,289 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073266994] [2021-05-02 20:44:51,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:44:51,289 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:44:51,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:44:51,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:44:51,290 INFO L87 Difference]: Start difference. First operand 309 states and 426 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 20:44:51,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:44:51,385 INFO L93 Difference]: Finished difference Result 313 states and 430 transitions. [2021-05-02 20:44:51,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:44:51,386 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 57 [2021-05-02 20:44:51,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:44:51,387 INFO L225 Difference]: With dead ends: 313 [2021-05-02 20:44:51,387 INFO L226 Difference]: Without dead ends: 313 [2021-05-02 20:44:51,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 48.3ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:44:51,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2021-05-02 20:44:51,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 312. [2021-05-02 20:44:51,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 230 states have (on average 1.308695652173913) internal successors, (301), 243 states have internal predecessors, (301), 65 states have call successors, (65), 17 states have call predecessors, (65), 16 states have return successors, (63), 51 states have call predecessors, (63), 63 states have call successors, (63) [2021-05-02 20:44:51,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 429 transitions. [2021-05-02 20:44:51,400 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 429 transitions. Word has length 57 [2021-05-02 20:44:51,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:44:51,401 INFO L480 AbstractCegarLoop]: Abstraction has 312 states and 429 transitions. [2021-05-02 20:44:51,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 20:44:51,402 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 429 transitions. [2021-05-02 20:44:51,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 20:44:51,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:44:51,402 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:44:51,617 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 20:44:51,618 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:44:51,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:44:51,618 INFO L82 PathProgramCache]: Analyzing trace with hash 1635475232, now seen corresponding path program 3 times [2021-05-02 20:44:51,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:44:51,618 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240839550] [2021-05-02 20:44:51,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:44:51,622 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:44:51,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1705452543] [2021-05-02 20:44:51,622 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 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 20:44:51,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 20:44:51,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:44:51,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 20:44:51,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:44:51,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:51,940 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:44:51,940 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:44:51,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240839550] [2021-05-02 20:44:51,940 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:44:51,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705452543] [2021-05-02 20:44:51,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705452543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:44:51,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:44:51,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:44:51,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800936160] [2021-05-02 20:44:51,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:44:51,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:44:51,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:44:51,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:44:51,942 INFO L87 Difference]: Start difference. First operand 312 states and 429 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 20:44:52,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:44:52,100 INFO L93 Difference]: Finished difference Result 314 states and 431 transitions. [2021-05-02 20:44:52,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:44:52,101 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 59 [2021-05-02 20:44:52,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:44:52,102 INFO L225 Difference]: With dead ends: 314 [2021-05-02 20:44:52,102 INFO L226 Difference]: Without dead ends: 314 [2021-05-02 20:44:52,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 90.5ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:44:52,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2021-05-02 20:44:52,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 314. [2021-05-02 20:44:52,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 232 states have (on average 1.3060344827586208) internal successors, (303), 245 states have internal predecessors, (303), 65 states have call successors, (65), 17 states have call predecessors, (65), 16 states have return successors, (63), 51 states have call predecessors, (63), 63 states have call successors, (63) [2021-05-02 20:44:52,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 431 transitions. [2021-05-02 20:44:52,112 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 431 transitions. Word has length 59 [2021-05-02 20:44:52,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:44:52,112 INFO L480 AbstractCegarLoop]: Abstraction has 314 states and 431 transitions. [2021-05-02 20:44:52,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-02 20:44:52,112 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 431 transitions. [2021-05-02 20:44:52,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 20:44:52,113 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:44:52,113 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:44:52,315 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:44:52,315 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:44:52,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:44:52,315 INFO L82 PathProgramCache]: Analyzing trace with hash -1972951801, now seen corresponding path program 2 times [2021-05-02 20:44:52,315 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:44:52,315 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378066666] [2021-05-02 20:44:52,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:44:52,324 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:44:52,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [308280940] [2021-05-02 20:44:52,325 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 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 [2021-05-02 20:44:52,366 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:44:52,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:44:52,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:44:52,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:44:52,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:52,540 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 10 proven. 54 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:44:52,540 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:44:52,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378066666] [2021-05-02 20:44:52,541 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:44:52,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308280940] [2021-05-02 20:44:52,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308280940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:44:52,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:44:52,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 20:44:52,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776969796] [2021-05-02 20:44:52,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:44:52,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:44:52,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:44:52,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:44:52,542 INFO L87 Difference]: Start difference. First operand 314 states and 431 transitions. Second operand has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-02 20:44:52,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:44:52,695 INFO L93 Difference]: Finished difference Result 345 states and 466 transitions. [2021-05-02 20:44:52,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:44:52,696 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) Word has length 63 [2021-05-02 20:44:52,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:44:52,697 INFO L225 Difference]: With dead ends: 345 [2021-05-02 20:44:52,697 INFO L226 Difference]: Without dead ends: 345 [2021-05-02 20:44:52,697 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 66.3ms TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:44:52,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2021-05-02 20:44:52,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 336. [2021-05-02 20:44:52,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 247 states have (on average 1.2955465587044535) internal successors, (320), 262 states have internal predecessors, (320), 69 states have call successors, (69), 20 states have call predecessors, (69), 19 states have return successors, (67), 53 states have call predecessors, (67), 67 states have call successors, (67) [2021-05-02 20:44:52,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 456 transitions. [2021-05-02 20:44:52,704 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 456 transitions. Word has length 63 [2021-05-02 20:44:52,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:44:52,704 INFO L480 AbstractCegarLoop]: Abstraction has 336 states and 456 transitions. [2021-05-02 20:44:52,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-02 20:44:52,705 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 456 transitions. [2021-05-02 20:44:52,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 20:44:52,705 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:44:52,705 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:44:52,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:44:52,921 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:44:52,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:44:52,921 INFO L82 PathProgramCache]: Analyzing trace with hash -518525390, now seen corresponding path program 3 times [2021-05-02 20:44:52,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:44:52,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359233978] [2021-05-02 20:44:52,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:44:52,926 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:44:52,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1483438625] [2021-05-02 20:44:52,926 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:44:53,040 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:44:53,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:44:53,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 20:44:53,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:44:53,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:53,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:53,209 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 32 proven. 1 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 20:44:53,209 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:44:53,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359233978] [2021-05-02 20:44:53,209 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:44:53,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483438625] [2021-05-02 20:44:53,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483438625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:44:53,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:44:53,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:44:53,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657609740] [2021-05-02 20:44:53,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:44:53,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:44:53,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:44:53,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:44:53,210 INFO L87 Difference]: Start difference. First operand 336 states and 456 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 20:44:55,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:44:55,347 INFO L93 Difference]: Finished difference Result 355 states and 477 transitions. [2021-05-02 20:44:55,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:44:55,348 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) Word has length 63 [2021-05-02 20:44:55,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:44:55,349 INFO L225 Difference]: With dead ends: 355 [2021-05-02 20:44:55,349 INFO L226 Difference]: Without dead ends: 355 [2021-05-02 20:44:55,349 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 69.5ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:44:55,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2021-05-02 20:44:55,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 354. [2021-05-02 20:44:55,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 354 states, 261 states have (on average 1.2873563218390804) internal successors, (336), 276 states have internal predecessors, (336), 71 states have call successors, (71), 22 states have call predecessors, (71), 21 states have return successors, (69), 55 states have call predecessors, (69), 69 states have call successors, (69) [2021-05-02 20:44:55,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 476 transitions. [2021-05-02 20:44:55,355 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 476 transitions. Word has length 63 [2021-05-02 20:44:55,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:44:55,356 INFO L480 AbstractCegarLoop]: Abstraction has 354 states and 476 transitions. [2021-05-02 20:44:55,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 20:44:55,356 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 476 transitions. [2021-05-02 20:44:55,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 20:44:55,356 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:44:55,356 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:44:55,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 20:44:55,559 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:44:55,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:44:55,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1277891114, now seen corresponding path program 2 times [2021-05-02 20:44:55,559 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:44:55,559 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205650117] [2021-05-02 20:44:55,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:44:55,563 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:44:55,563 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [48756092] [2021-05-02 20:44:55,563 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:44:55,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:44:55,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:44:55,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 20:44:55,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:44:55,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:55,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:55,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:55,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:55,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:44:55,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:07,048 WARN L205 SmtUtils]: Spent 9.23 s on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 20:45:07,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:07,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:11,401 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification that was a NOOP. DAG size: 27 [2021-05-02 20:45:11,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:11,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:18,102 WARN L205 SmtUtils]: Spent 4.05 s on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 20:45:18,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:18,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:18,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:18,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:24,644 WARN L205 SmtUtils]: Spent 4.07 s on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 20:45:52,971 WARN L205 SmtUtils]: Spent 14.43 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 20:45:52,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:52,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:45:53,336 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 17 proven. 26 refuted. 3 times theorem prover too weak. 23 trivial. 0 not checked. [2021-05-02 20:45:53,336 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:45:53,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205650117] [2021-05-02 20:45:53,336 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:45:53,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48756092] [2021-05-02 20:45:53,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48756092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:45:53,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:45:53,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:45:53,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046018987] [2021-05-02 20:45:53,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:45:53,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:45:53,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:45:53,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=169, Unknown=8, NotChecked=0, Total=210 [2021-05-02 20:45:53,337 INFO L87 Difference]: Start difference. First operand 354 states and 476 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 12 states have internal predecessors, (36), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-05-02 20:46:42,786 WARN L205 SmtUtils]: Spent 10.11 s on a formula simplification that was a NOOP. DAG size: 38 [2021-05-02 20:46:55,031 WARN L205 SmtUtils]: Spent 4.04 s on a formula simplification that was a NOOP. DAG size: 41 [2021-05-02 20:47:31,100 WARN L205 SmtUtils]: Spent 15.73 s on a formula simplification that was a NOOP. DAG size: 42 [2021-05-02 20:47:55,243 WARN L205 SmtUtils]: Spent 8.46 s on a formula simplification that was a NOOP. DAG size: 39