/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/hard-ll_valuebound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 08:52:50,758 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 08:52:50,760 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 08:52:50,782 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 08:52:50,782 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 08:52:50,783 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 08:52:50,784 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 08:52:50,790 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 08:52:50,791 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 08:52:50,791 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 08:52:50,792 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 08:52:50,793 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 08:52:50,793 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 08:52:50,794 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 08:52:50,794 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 08:52:50,795 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 08:52:50,795 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 08:52:50,796 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 08:52:50,797 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 08:52:50,815 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 08:52:50,816 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 08:52:50,819 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 08:52:50,819 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 08:52:50,820 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 08:52:50,821 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 08:52:50,826 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 08:52:50,826 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 08:52:50,827 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 08:52:50,833 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 08:52:50,845 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 08:52:50,845 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 08:52:50,846 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 08:52:50,846 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 08:52:50,846 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 08:52:50,846 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 08:52:50,846 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 08:52:50,846 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 08:52:50,846 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 08:52:50,846 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 08:52:50,847 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 08:52:50,847 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 08:52:50,847 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 08:52:50,847 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 08:52:50,847 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 08:52:50,847 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 08:52:50,847 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 08:52:50,847 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 08:52:50,847 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 08:52:50,848 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 08:52:50,848 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 08:52:50,848 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 08:52:50,848 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 08:52:51,083 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 08:52:51,098 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 08:52:51,099 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 08:52:51,100 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 08:52:51,100 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 08:52:51,101 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound100.c [2021-05-06 08:52:51,140 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fb00690c/eceb789efbb043728288085a58354eb1/FLAGa927e997b [2021-05-06 08:52:51,451 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 08:52:51,452 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound100.c [2021-05-06 08:52:51,456 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fb00690c/eceb789efbb043728288085a58354eb1/FLAGa927e997b [2021-05-06 08:52:51,877 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fb00690c/eceb789efbb043728288085a58354eb1 [2021-05-06 08:52:51,878 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 08:52:51,879 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 08:52:51,882 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 08:52:51,882 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 08:52:51,884 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 08:52:51,885 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 08:52:51" (1/1) ... [2021-05-06 08:52:51,885 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@395e309b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:51, skipping insertion in model container [2021-05-06 08:52:51,886 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 08:52:51" (1/1) ... [2021-05-06 08:52:51,890 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 08:52:51,902 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 08:52:51,986 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/hard-ll_valuebound100.c[546,559] [2021-05-06 08:52:51,999 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 08:52:52,004 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 08:52:52,023 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/hard-ll_valuebound100.c[546,559] [2021-05-06 08:52:52,039 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 08:52:52,047 INFO L208 MainTranslator]: Completed translation [2021-05-06 08:52:52,047 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52 WrapperNode [2021-05-06 08:52:52,047 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 08:52:52,048 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 08:52:52,048 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 08:52:52,048 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 08:52:52,054 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52" (1/1) ... [2021-05-06 08:52:52,054 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52" (1/1) ... [2021-05-06 08:52:52,058 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52" (1/1) ... [2021-05-06 08:52:52,058 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52" (1/1) ... [2021-05-06 08:52:52,061 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52" (1/1) ... [2021-05-06 08:52:52,063 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52" (1/1) ... [2021-05-06 08:52:52,064 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52" (1/1) ... [2021-05-06 08:52:52,065 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 08:52:52,067 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 08:52:52,067 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 08:52:52,067 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 08:52:52,067 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 08:52:52,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 08:52:52,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 08:52:52,123 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 08:52:52,123 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 08:52:52,123 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 08:52:52,123 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 08:52:52,123 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 08:52:52,123 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 08:52:52,123 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 08:52:52,124 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 08:52:52,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-06 08:52:52,124 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 08:52:52,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 08:52:52,124 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 08:52:52,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 08:52:52,125 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 08:52:52,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 08:52:52,125 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 08:52:52,125 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 08:52:52,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 08:52:52,310 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 08:52:52,310 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 08:52:52,311 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 08:52:52 BoogieIcfgContainer [2021-05-06 08:52:52,311 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 08:52:52,312 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 08:52:52,312 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 08:52:52,313 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 08:52:52,314 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 08:52:52" (1/1) ... [2021-05-06 08:52:52,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 08:52:52 BasicIcfg [2021-05-06 08:52:52,341 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 08:52:52,342 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 08:52:52,343 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 08:52:52,344 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 08:52:52,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 08:52:51" (1/4) ... [2021-05-06 08:52:52,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8175416 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 08:52:52, skipping insertion in model container [2021-05-06 08:52:52,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:52:52" (2/4) ... [2021-05-06 08:52:52,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8175416 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 08:52:52, skipping insertion in model container [2021-05-06 08:52:52,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 08:52:52" (3/4) ... [2021-05-06 08:52:52,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8175416 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 08:52:52, skipping insertion in model container [2021-05-06 08:52:52,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 08:52:52" (4/4) ... [2021-05-06 08:52:52,346 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_valuebound100.cJordan [2021-05-06 08:52:52,349 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 08:52:52,352 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 08:52:52,362 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 08:52:52,375 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 08:52:52,375 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 08:52:52,375 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 08:52:52,375 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 08:52:52,375 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 08:52:52,375 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 08:52:52,375 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 08:52:52,375 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 08:52:52,384 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 08:52:52,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 08:52:52,388 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:52,388 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:52:52,389 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:52,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:52,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1011787902, now seen corresponding path program 1 times [2021-05-06 08:52:52,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:52,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009231663] [2021-05-06 08:52:52,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:52,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 08:52:52,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 08:52:52,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-06 08:52:52,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 08:52:52,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,579 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 08:52:52,580 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:52,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009231663] [2021-05-06 08:52:52,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009231663] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:52:52,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:52:52,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 08:52:52,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135578769] [2021-05-06 08:52:52,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 08:52:52,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:52,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 08:52:52,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 08:52:52,593 INFO L87 Difference]: Start difference. First operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 08:52:52,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:52,706 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2021-05-06 08:52:52,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 08:52:52,708 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2021-05-06 08:52:52,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:52,714 INFO L225 Difference]: With dead ends: 38 [2021-05-06 08:52:52,714 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 08:52:52,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 08:52:52,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 08:52:52,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-06 08:52:52,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 08:52:52,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2021-05-06 08:52:52,743 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 28 [2021-05-06 08:52:52,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:52,743 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2021-05-06 08:52:52,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 08:52:52,744 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2021-05-06 08:52:52,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 08:52:52,745 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:52,745 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:52:52,745 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 08:52:52,745 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:52,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:52,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1710049411, now seen corresponding path program 1 times [2021-05-06 08:52:52,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:52,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531497478] [2021-05-06 08:52:52,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:52,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 08:52:52,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 08:52:52,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-06 08:52:52,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 08:52:52,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:52,882 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 08:52:52,882 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:52,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531497478] [2021-05-06 08:52:52,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531497478] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:52:52,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:52:52,883 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 08:52:52,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709090902] [2021-05-06 08:52:52,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 08:52:52,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:52,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 08:52:52,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:52:52,884 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 08:52:53,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:53,113 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2021-05-06 08:52:53,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 08:52:53,114 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2021-05-06 08:52:53,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:53,116 INFO L225 Difference]: With dead ends: 44 [2021-05-06 08:52:53,116 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 08:52:53,117 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 111.0ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:52:53,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 08:52:53,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2021-05-06 08:52:53,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 12 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 08:52:53,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2021-05-06 08:52:53,131 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 28 [2021-05-06 08:52:53,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:53,132 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2021-05-06 08:52:53,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 08:52:53,133 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2021-05-06 08:52:53,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 08:52:53,138 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:53,138 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:52:53,138 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 08:52:53,139 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:53,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:53,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1042498848, now seen corresponding path program 1 times [2021-05-06 08:52:53,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:53,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [221586955] [2021-05-06 08:52:53,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:53,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:53,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 08:52:53,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:53,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 08:52:53,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:53,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-06 08:52:53,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:53,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 08:52:53,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:53,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-06 08:52:53,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:53,260 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 08:52:53,260 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:53,260 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [221586955] [2021-05-06 08:52:53,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [221586955] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:52:53,260 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:52:53,261 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 08:52:53,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433060189] [2021-05-06 08:52:53,261 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 08:52:53,261 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:53,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 08:52:53,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:52:53,262 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 08:52:53,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:53,485 INFO L93 Difference]: Finished difference Result 48 states and 61 transitions. [2021-05-06 08:52:53,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 08:52:53,485 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 33 [2021-05-06 08:52:53,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:53,486 INFO L225 Difference]: With dead ends: 48 [2021-05-06 08:52:53,487 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 08:52:53,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 109.7ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:52:53,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 08:52:53,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2021-05-06 08:52:53,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 12 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 08:52:53,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2021-05-06 08:52:53,498 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2021-05-06 08:52:53,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:53,499 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2021-05-06 08:52:53,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 08:52:53,499 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2021-05-06 08:52:53,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 08:52:53,500 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:53,500 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:52:53,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 08:52:53,501 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:53,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:53,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1436069466, now seen corresponding path program 1 times [2021-05-06 08:52:53,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:53,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061663610] [2021-05-06 08:52:53,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:53,520 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:52:53,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1506304302] [2021-05-06 08:52:53,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:53,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:53,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 08:52:53,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:52:53,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:53,702 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 08:52:53,702 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:53,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061663610] [2021-05-06 08:52:53,703 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:52:53,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506304302] [2021-05-06 08:52:53,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506304302] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:52:53,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:52:53,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 08:52:53,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616523356] [2021-05-06 08:52:53,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 08:52:53,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:53,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 08:52:53,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 08:52:53,704 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-05-06 08:52:53,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:53,741 INFO L93 Difference]: Finished difference Result 56 states and 70 transitions. [2021-05-06 08:52:53,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 08:52:53,741 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 38 [2021-05-06 08:52:53,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:53,742 INFO L225 Difference]: With dead ends: 56 [2021-05-06 08:52:53,742 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 08:52:53,742 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.4ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:52:53,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 08:52:53,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-06 08:52:53,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 18 states have call successors, (18), 7 states have call predecessors, (18), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 08:52:53,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2021-05-06 08:52:53,746 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 38 [2021-05-06 08:52:53,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:53,746 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2021-05-06 08:52:53,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-05-06 08:52:53,746 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2021-05-06 08:52:53,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 08:52:53,747 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:53,747 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 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] [2021-05-06 08:52:53,963 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:53,963 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:53,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:53,964 INFO L82 PathProgramCache]: Analyzing trace with hash 5711864, now seen corresponding path program 1 times [2021-05-06 08:52:53,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:53,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931980400] [2021-05-06 08:52:53,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:53,970 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:52:53,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2035634056] [2021-05-06 08:52:53,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:54,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:54,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-06 08:52:54,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:52:54,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,273 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-06 08:52:54,274 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:54,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931980400] [2021-05-06 08:52:54,275 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:52:54,275 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035634056] [2021-05-06 08:52:54,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035634056] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:52:54,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:52:54,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 08:52:54,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003630419] [2021-05-06 08:52:54,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 08:52:54,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:54,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 08:52:54,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 08:52:54,277 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 08:52:54,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:54,382 INFO L93 Difference]: Finished difference Result 67 states and 77 transitions. [2021-05-06 08:52:54,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 08:52:54,382 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-05-06 08:52:54,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:54,386 INFO L225 Difference]: With dead ends: 67 [2021-05-06 08:52:54,386 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 08:52:54,386 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 54.7ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-06 08:52:54,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 08:52:54,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-06 08:52:54,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 08:52:54,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-06 08:52:54,397 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 45 [2021-05-06 08:52:54,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:54,397 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-06 08:52:54,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 08:52:54,398 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-06 08:52:54,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 08:52:54,401 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:54,401 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 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] [2021-05-06 08:52:54,608 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:54,609 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:54,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:54,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1597443315, now seen corresponding path program 1 times [2021-05-06 08:52:54,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:54,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986475121] [2021-05-06 08:52:54,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:54,616 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:52:54,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [889433992] [2021-05-06 08:52:54,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:54,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:54,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-06 08:52:54,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:52:54,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:54,833 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-05-06 08:52:54,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:54,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986475121] [2021-05-06 08:52:54,833 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:52:54,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889433992] [2021-05-06 08:52:54,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889433992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:52:54,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:52:54,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 08:52:54,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328897744] [2021-05-06 08:52:54,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 08:52:54,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:54,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 08:52:54,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 08:52:54,835 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 08:52:54,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:54,976 INFO L93 Difference]: Finished difference Result 78 states and 95 transitions. [2021-05-06 08:52:54,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 08:52:54,978 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 3 states have call successors, (9) Word has length 55 [2021-05-06 08:52:54,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:54,978 INFO L225 Difference]: With dead ends: 78 [2021-05-06 08:52:54,978 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 08:52:54,979 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 50.0ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-06 08:52:54,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 08:52:54,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-06 08:52:54,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 46 states have internal predecessors, (50), 23 states have call successors, (23), 10 states have call predecessors, (23), 9 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 08:52:54,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 93 transitions. [2021-05-06 08:52:54,982 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 93 transitions. Word has length 55 [2021-05-06 08:52:54,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:54,982 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 93 transitions. [2021-05-06 08:52:54,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 08:52:54,983 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 93 transitions. [2021-05-06 08:52:54,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 08:52:54,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:54,983 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 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] [2021-05-06 08:52:55,192 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:55,193 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:55,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:55,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1292294975, now seen corresponding path program 1 times [2021-05-06 08:52:55,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:55,195 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139372260] [2021-05-06 08:52:55,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:55,202 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:52:55,202 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [176729769] [2021-05-06 08:52:55,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:55,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:55,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 08:52:55,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:52:55,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,512 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 12 proven. 11 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-06 08:52:55,512 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:55,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139372260] [2021-05-06 08:52:55,512 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:52:55,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176729769] [2021-05-06 08:52:55,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176729769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:52:55,512 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:52:55,512 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 08:52:55,512 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169579330] [2021-05-06 08:52:55,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 08:52:55,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:55,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 08:52:55,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:52:55,513 INFO L87 Difference]: Start difference. First operand 77 states and 93 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 08:52:55,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:55,668 INFO L93 Difference]: Finished difference Result 94 states and 109 transitions. [2021-05-06 08:52:55,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 08:52:55,668 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 62 [2021-05-06 08:52:55,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:55,669 INFO L225 Difference]: With dead ends: 94 [2021-05-06 08:52:55,669 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 08:52:55,669 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 70.2ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-06 08:52:55,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 08:52:55,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-05-06 08:52:55,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 55 states have internal predecessors, (58), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 08:52:55,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2021-05-06 08:52:55,673 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 62 [2021-05-06 08:52:55,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:55,674 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2021-05-06 08:52:55,674 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 08:52:55,674 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2021-05-06 08:52:55,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 08:52:55,674 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:55,674 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:52:55,888 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:55,889 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:55,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:55,889 INFO L82 PathProgramCache]: Analyzing trace with hash 294687610, now seen corresponding path program 2 times [2021-05-06 08:52:55,889 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:55,889 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462778137] [2021-05-06 08:52:55,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:55,897 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:52:55,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1863811004] [2021-05-06 08:52:55,897 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:55,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 08:52:55,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:52:55,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-06 08:52:55,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:52:55,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:55,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,127 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 22 proven. 13 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-05-06 08:52:56,127 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:56,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462778137] [2021-05-06 08:52:56,127 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:52:56,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863811004] [2021-05-06 08:52:56,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863811004] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:52:56,127 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:52:56,127 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 08:52:56,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824286798] [2021-05-06 08:52:56,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 08:52:56,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:56,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 08:52:56,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:52:56,128 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 4 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-06 08:52:56,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:56,306 INFO L93 Difference]: Finished difference Result 114 states and 138 transitions. [2021-05-06 08:52:56,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 08:52:56,307 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 4 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 72 [2021-05-06 08:52:56,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:56,308 INFO L225 Difference]: With dead ends: 114 [2021-05-06 08:52:56,308 INFO L226 Difference]: Without dead ends: 113 [2021-05-06 08:52:56,308 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 47.6ms TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-06 08:52:56,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-06 08:52:56,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 111. [2021-05-06 08:52:56,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 65 states have (on average 1.123076923076923) internal successors, (73), 68 states have internal predecessors, (73), 32 states have call successors, (32), 14 states have call predecessors, (32), 13 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-06 08:52:56,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 134 transitions. [2021-05-06 08:52:56,313 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 134 transitions. Word has length 72 [2021-05-06 08:52:56,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:56,313 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 134 transitions. [2021-05-06 08:52:56,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 4 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-06 08:52:56,313 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 134 transitions. [2021-05-06 08:52:56,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 08:52:56,314 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:56,314 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:52:56,524 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:56,525 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:56,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:56,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1689231171, now seen corresponding path program 1 times [2021-05-06 08:52:56,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:56,525 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225576633] [2021-05-06 08:52:56,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:56,544 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:52:56,544 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [341883426] [2021-05-06 08:52:56,544 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 [2021-05-06 08:52:56,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:56,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-06 08:52:56,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:52:56,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:56,909 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 42 proven. 8 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2021-05-06 08:52:56,909 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:56,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225576633] [2021-05-06 08:52:56,910 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:52:56,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341883426] [2021-05-06 08:52:56,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341883426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:52:56,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:52:56,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 08:52:56,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271273066] [2021-05-06 08:52:56,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 08:52:56,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:56,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 08:52:56,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-06 08:52:56,911 INFO L87 Difference]: Start difference. First operand 111 states and 134 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-06 08:52:57,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:57,127 INFO L93 Difference]: Finished difference Result 121 states and 142 transitions. [2021-05-06 08:52:57,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 08:52:57,127 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 75 [2021-05-06 08:52:57,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:57,128 INFO L225 Difference]: With dead ends: 121 [2021-05-06 08:52:57,128 INFO L226 Difference]: Without dead ends: 121 [2021-05-06 08:52:57,129 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 144.2ms TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-06 08:52:57,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-06 08:52:57,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 119. [2021-05-06 08:52:57,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 71 states have (on average 1.1126760563380282) internal successors, (79), 74 states have internal predecessors, (79), 32 states have call successors, (32), 16 states have call predecessors, (32), 15 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-06 08:52:57,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 140 transitions. [2021-05-06 08:52:57,133 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 140 transitions. Word has length 75 [2021-05-06 08:52:57,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:57,133 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 140 transitions. [2021-05-06 08:52:57,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-06 08:52:57,133 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 140 transitions. [2021-05-06 08:52:57,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 08:52:57,134 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:57,134 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:52:57,348 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:52:57,349 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:57,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:57,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1714864424, now seen corresponding path program 2 times [2021-05-06 08:52:57,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:57,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851025373] [2021-05-06 08:52:57,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:57,354 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:52:57,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [72480022] [2021-05-06 08:52:57,355 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 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 [2021-05-06 08:52:57,406 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 08:52:57,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:52:57,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 08:52:57,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:52:57,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:57,767 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 21 proven. 18 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-05-06 08:52:57,767 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:57,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851025373] [2021-05-06 08:52:57,768 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:52:57,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72480022] [2021-05-06 08:52:57,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72480022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:52:57,768 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:52:57,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 08:52:57,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33983822] [2021-05-06 08:52:57,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 08:52:57,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:57,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 08:52:57,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-06 08:52:57,769 INFO L87 Difference]: Start difference. First operand 119 states and 140 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 9 states have internal predecessors, (24), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-06 08:52:58,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:58,086 INFO L93 Difference]: Finished difference Result 141 states and 164 transitions. [2021-05-06 08:52:58,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 08:52:58,087 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 9 states have internal predecessors, (24), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 79 [2021-05-06 08:52:58,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:58,089 INFO L225 Difference]: With dead ends: 141 [2021-05-06 08:52:58,089 INFO L226 Difference]: Without dead ends: 136 [2021-05-06 08:52:58,089 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 224.9ms TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-05-06 08:52:58,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-06 08:52:58,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-05-06 08:52:58,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 86 states have internal predecessors, (91), 34 states have call successors, (34), 19 states have call predecessors, (34), 18 states have return successors, (31), 30 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 08:52:58,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 156 transitions. [2021-05-06 08:52:58,093 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 156 transitions. Word has length 79 [2021-05-06 08:52:58,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:58,094 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 156 transitions. [2021-05-06 08:52:58,094 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 9 states have internal predecessors, (24), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-06 08:52:58,094 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 156 transitions. [2021-05-06 08:52:58,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 08:52:58,094 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:58,095 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:52:58,304 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 08:52:58,304 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:58,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:58,305 INFO L82 PathProgramCache]: Analyzing trace with hash -102783885, now seen corresponding path program 1 times [2021-05-06 08:52:58,305 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:58,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946150193] [2021-05-06 08:52:58,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:58,310 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:52:58,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [740134407] [2021-05-06 08:52:58,310 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 [2021-05-06 08:52:58,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:52:58,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 08:52:58,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:52:58,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:52:58,467 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2021-05-06 08:52:58,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:52:58,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946150193] [2021-05-06 08:52:58,467 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:52:58,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740134407] [2021-05-06 08:52:58,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740134407] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:52:58,467 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:52:58,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 08:52:58,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810129306] [2021-05-06 08:52:58,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 08:52:58,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:52:58,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 08:52:58,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 08:52:58,468 INFO L87 Difference]: Start difference. First operand 136 states and 156 transitions. Second operand has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-05-06 08:52:58,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:52:58,553 INFO L93 Difference]: Finished difference Result 158 states and 188 transitions. [2021-05-06 08:52:58,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 08:52:58,553 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 86 [2021-05-06 08:52:58,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:52:58,554 INFO L225 Difference]: With dead ends: 158 [2021-05-06 08:52:58,554 INFO L226 Difference]: Without dead ends: 135 [2021-05-06 08:52:58,554 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 31.8ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 08:52:58,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-06 08:52:58,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 132. [2021-05-06 08:52:58,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 79 states have (on average 1.1265822784810127) internal successors, (89), 83 states have internal predecessors, (89), 36 states have call successors, (36), 17 states have call predecessors, (36), 16 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-06 08:52:58,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 157 transitions. [2021-05-06 08:52:58,558 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 157 transitions. Word has length 86 [2021-05-06 08:52:58,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:52:58,558 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 157 transitions. [2021-05-06 08:52:58,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-05-06 08:52:58,558 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 157 transitions. [2021-05-06 08:52:58,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 08:52:58,559 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:52:58,559 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:52:58,779 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-06 08:52:58,779 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:52:58,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:52:58,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1101138899, now seen corresponding path program 3 times [2021-05-06 08:52:58,780 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:52:58,780 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478937617] [2021-05-06 08:52:58,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:52:58,796 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:52:58,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [415881085] [2021-05-06 08:52:58,796 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 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 [2021-05-06 08:52:58,843 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-06 08:52:58,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:52:58,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 08:52:58,845 INFO L286 TraceCheckSpWp]: Computing forward predicates...