/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/ps4-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 07:07:31,351 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 07:07:31,353 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 07:07:31,379 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 07:07:31,388 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 07:07:31,389 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 07:07:31,389 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 07:07:31,390 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 07:07:31,391 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 07:07:31,392 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 07:07:31,393 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 07:07:31,395 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 07:07:31,396 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 07:07:31,402 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 07:07:31,403 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 07:07:31,403 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 07:07:31,405 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 07:07:31,412 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 07:07:31,415 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 07:07:31,417 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 07:07:31,421 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 07:07:31,438 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 07:07:31,438 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 07:07:31,441 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 07:07:31,441 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 07:07:31,441 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 07:07:31,441 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 07:07:31,442 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 07:07:31,442 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 07:07:31,442 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 07:07:31,442 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 07:07:31,443 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 07:07:31,443 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 07:07:31,443 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 07:07:31,443 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 07:07:31,443 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 07:07:31,444 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 07:07:31,444 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 07:07:31,444 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 07:07:31,444 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 07:07:31,444 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 07:07:31,444 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 07:07:31,446 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 07:07:31,446 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 07:07:31,729 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 07:07:31,748 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 07:07:31,751 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 07:07:31,752 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 07:07:31,753 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 07:07:31,753 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps4-ll.c [2021-05-06 07:07:31,823 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fce0b342b/433ed1a4470d410e899370b9fd1a2d34/FLAG13132db69 [2021-05-06 07:07:32,311 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 07:07:32,311 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps4-ll.c [2021-05-06 07:07:32,317 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fce0b342b/433ed1a4470d410e899370b9fd1a2d34/FLAG13132db69 [2021-05-06 07:07:32,807 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fce0b342b/433ed1a4470d410e899370b9fd1a2d34 [2021-05-06 07:07:32,812 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 07:07:32,813 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 07:07:32,816 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 07:07:32,816 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 07:07:32,819 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 07:07:32,820 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 07:07:32" (1/1) ... [2021-05-06 07:07:32,821 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@92650ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:32, skipping insertion in model container [2021-05-06 07:07:32,821 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 07:07:32" (1/1) ... [2021-05-06 07:07:32,828 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 07:07:32,842 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 07:07:32,940 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/ps4-ll.c[458,471] [2021-05-06 07:07:32,951 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 07:07:32,957 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 07:07:33,017 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/ps4-ll.c[458,471] [2021-05-06 07:07:33,028 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 07:07:33,044 INFO L208 MainTranslator]: Completed translation [2021-05-06 07:07:33,044 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33 WrapperNode [2021-05-06 07:07:33,045 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 07:07:33,047 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 07:07:33,047 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 07:07:33,047 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 07:07:33,057 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33" (1/1) ... [2021-05-06 07:07:33,058 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33" (1/1) ... [2021-05-06 07:07:33,063 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33" (1/1) ... [2021-05-06 07:07:33,063 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33" (1/1) ... [2021-05-06 07:07:33,066 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33" (1/1) ... [2021-05-06 07:07:33,070 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33" (1/1) ... [2021-05-06 07:07:33,071 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33" (1/1) ... [2021-05-06 07:07:33,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 07:07:33,073 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 07:07:33,073 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 07:07:33,073 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 07:07:33,074 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33" (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 07:07:33,133 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 07:07:33,133 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 07:07:33,133 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 07:07:33,133 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 07:07:33,133 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 07:07:33,134 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 07:07:33,134 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 07:07:33,135 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 07:07:33,135 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 07:07:33,135 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 07:07:33,135 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 07:07:33,402 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 07:07:33,402 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 07:07:33,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:07:33 BoogieIcfgContainer [2021-05-06 07:07:33,404 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 07:07:33,404 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 07:07:33,404 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 07:07:33,405 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 07:07:33,408 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:07:33" (1/1) ... [2021-05-06 07:07:33,441 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 07:07:33 BasicIcfg [2021-05-06 07:07:33,441 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 07:07:33,443 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 07:07:33,443 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 07:07:33,445 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 07:07:33,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 07:07:32" (1/4) ... [2021-05-06 07:07:33,446 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61432f82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 07:07:33, skipping insertion in model container [2021-05-06 07:07:33,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:33" (2/4) ... [2021-05-06 07:07:33,446 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61432f82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 07:07:33, skipping insertion in model container [2021-05-06 07:07:33,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:07:33" (3/4) ... [2021-05-06 07:07:33,447 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61432f82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 07:07:33, skipping insertion in model container [2021-05-06 07:07:33,447 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 07:07:33" (4/4) ... [2021-05-06 07:07:33,448 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll.cJordan [2021-05-06 07:07:33,452 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 07:07:33,456 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 07:07:33,488 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 07:07:33,527 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 07:07:33,528 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 07:07:33,528 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 07:07:33,528 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 07:07:33,528 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 07:07:33,528 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 07:07:33,528 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 07:07:33,528 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 07:07:33,551 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 07:07:33,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 07:07:33,560 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:33,560 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:33,561 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:33,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:33,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1382868560, now seen corresponding path program 1 times [2021-05-06 07:07:33,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:33,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227233592] [2021-05-06 07:07:33,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:33,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:33,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 07:07:33,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:33,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 07:07:33,825 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:33,825 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227233592] [2021-05-06 07:07:33,826 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227233592] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:07:33,826 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:07:33,827 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 07:07:33,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043599342] [2021-05-06 07:07:33,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 07:07:33,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:33,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 07:07:33,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 07:07:33,849 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 07:07:33,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:33,925 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-06 07:07:33,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 07:07:33,927 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 07:07:33,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:33,934 INFO L225 Difference]: With dead ends: 22 [2021-05-06 07:07:33,934 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 07:07:33,936 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 50.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 07:07:33,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 07:07:33,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 07:07:33,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 10 states have internal predecessors, (11), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 07:07:33,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 07:07:33,968 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-06 07:07:33,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:33,968 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 07:07:33,968 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 07:07:33,968 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 07:07:33,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 07:07:33,969 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:33,969 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:33,970 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 07:07:33,970 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:33,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:33,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1384745393, now seen corresponding path program 1 times [2021-05-06 07:07:33,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:33,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492612516] [2021-05-06 07:07:33,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:34,002 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:34,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2102837723] [2021-05-06 07:07:34,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:34,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:34,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 07:07:34,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:34,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:34,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 07:07:34,171 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:34,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492612516] [2021-05-06 07:07:34,172 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:34,172 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102837723] [2021-05-06 07:07:34,172 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102837723] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:07:34,172 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:07:34,172 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 07:07:34,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93837544] [2021-05-06 07:07:34,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 07:07:34,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:34,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 07:07:34,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 07:07:34,175 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 07:07:34,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:34,215 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-05-06 07:07:34,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 07:07:34,216 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 07:07:34,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:34,217 INFO L225 Difference]: With dead ends: 26 [2021-05-06 07:07:34,217 INFO L226 Difference]: Without dead ends: 24 [2021-05-06 07:07:34,218 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.4ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 07:07:34,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-06 07:07:34,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-06 07:07:34,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 07:07:34,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-05-06 07:07:34,224 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 11 [2021-05-06 07:07:34,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:34,224 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-05-06 07:07:34,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 07:07:34,225 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-05-06 07:07:34,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 07:07:34,225 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:34,225 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:34,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 07:07:34,449 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:34,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:34,450 INFO L82 PathProgramCache]: Analyzing trace with hash -803685984, now seen corresponding path program 1 times [2021-05-06 07:07:34,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:34,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523317888] [2021-05-06 07:07:34,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:34,459 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:34,460 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2123365180] [2021-05-06 07:07:34,460 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 07:07:34,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:34,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 07:07:34,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:34,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:34,639 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 07:07:34,639 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:34,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523317888] [2021-05-06 07:07:34,639 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:34,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123365180] [2021-05-06 07:07:34,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123365180] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:34,640 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:34,640 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 07:07:34,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38411832] [2021-05-06 07:07:34,640 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 07:07:34,641 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:34,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 07:07:34,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 07:07:34,642 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 07:07:34,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:34,698 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-05-06 07:07:34,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 07:07:34,699 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-06 07:07:34,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:34,701 INFO L225 Difference]: With dead ends: 33 [2021-05-06 07:07:34,702 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 07:07:34,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.5ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:07:34,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 07:07:34,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 07:07:34,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 21 states have internal predecessors, (22), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 07:07:34,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-06 07:07:34,712 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-05-06 07:07:34,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:34,713 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-06 07:07:34,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 07:07:34,713 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-06 07:07:34,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 07:07:34,714 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:34,715 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:34,933 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:34,933 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:34,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:34,934 INFO L82 PathProgramCache]: Analyzing trace with hash 842365436, now seen corresponding path program 1 times [2021-05-06 07:07:34,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:34,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628914082] [2021-05-06 07:07:34,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:34,943 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:34,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [466835956] [2021-05-06 07:07:34,944 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 07:07:34,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:34,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 07:07:34,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:35,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,142 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 07:07:35,142 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:35,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628914082] [2021-05-06 07:07:35,142 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:35,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466835956] [2021-05-06 07:07:35,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466835956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:35,143 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:35,143 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 07:07:35,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950601086] [2021-05-06 07:07:35,143 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 07:07:35,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:35,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 07:07:35,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:07:35,144 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 07:07:35,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:35,195 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-05-06 07:07:35,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 07:07:35,195 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 24 [2021-05-06 07:07:35,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:35,196 INFO L225 Difference]: With dead ends: 36 [2021-05-06 07:07:35,196 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 07:07:35,197 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 51.8ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 07:07:35,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 07:07:35,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-06 07:07:35,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 19 states have (on average 1.105263157894737) internal successors, (21), 20 states have internal predecessors, (21), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 07:07:35,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-05-06 07:07:35,210 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 24 [2021-05-06 07:07:35,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:35,211 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-05-06 07:07:35,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 07:07:35,211 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-05-06 07:07:35,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 07:07:35,212 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:35,212 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:35,436 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:35,437 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:35,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:35,437 INFO L82 PathProgramCache]: Analyzing trace with hash 371166929, now seen corresponding path program 2 times [2021-05-06 07:07:35,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:35,438 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807313882] [2021-05-06 07:07:35,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:35,453 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:35,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [390836870] [2021-05-06 07:07:35,453 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 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 07:07:35,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 07:07:35,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:35,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 07:07:35,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:35,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:35,652 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 07:07:35,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:35,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807313882] [2021-05-06 07:07:35,652 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:35,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390836870] [2021-05-06 07:07:35,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390836870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:35,653 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:35,653 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 07:07:35,653 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951337025] [2021-05-06 07:07:35,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 07:07:35,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:35,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 07:07:35,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:07:35,659 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 07:07:35,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:35,719 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2021-05-06 07:07:35,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 07:07:35,720 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 25 [2021-05-06 07:07:35,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:35,722 INFO L225 Difference]: With dead ends: 40 [2021-05-06 07:07:35,722 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 07:07:35,724 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.0ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:07:35,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 07:07:35,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-06 07:07:35,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 24 states have (on average 1.125) internal successors, (27), 26 states have internal predecessors, (27), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 07:07:35,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-05-06 07:07:35,735 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 25 [2021-05-06 07:07:35,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:35,735 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-05-06 07:07:35,735 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 07:07:35,735 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-05-06 07:07:35,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 07:07:35,736 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:35,736 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:35,958 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:35,959 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:35,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:35,959 INFO L82 PathProgramCache]: Analyzing trace with hash 186246765, now seen corresponding path program 2 times [2021-05-06 07:07:35,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:35,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289876631] [2021-05-06 07:07:35,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:35,967 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:35,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [659456691] [2021-05-06 07:07:35,968 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 07:07:36,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 07:07:36,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:36,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 07:07:36,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:36,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,184 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 07:07:36,184 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:36,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289876631] [2021-05-06 07:07:36,185 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:36,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659456691] [2021-05-06 07:07:36,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659456691] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:36,185 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:36,185 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 07:07:36,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688763120] [2021-05-06 07:07:36,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 07:07:36,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:36,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 07:07:36,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:07:36,187 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 07:07:36,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:36,252 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-05-06 07:07:36,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 07:07:36,253 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 31 [2021-05-06 07:07:36,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:36,254 INFO L225 Difference]: With dead ends: 43 [2021-05-06 07:07:36,254 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 07:07:36,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 74.0ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-06 07:07:36,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 07:07:36,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-06 07:07:36,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 25 states have internal predecessors, (26), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 07:07:36,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-06 07:07:36,257 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 31 [2021-05-06 07:07:36,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:36,258 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-06 07:07:36,258 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 07:07:36,258 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-06 07:07:36,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-06 07:07:36,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:36,259 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:36,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 07:07:36,459 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:36,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:36,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1506324608, now seen corresponding path program 3 times [2021-05-06 07:07:36,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:36,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615287134] [2021-05-06 07:07:36,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:36,470 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:36,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [103362098] [2021-05-06 07:07:36,470 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 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 07:07:36,680 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 07:07:36,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:36,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 07:07:36,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:36,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:36,795 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-06 07:07:36,795 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:36,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615287134] [2021-05-06 07:07:36,795 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:36,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103362098] [2021-05-06 07:07:36,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103362098] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:36,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:36,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 07:07:36,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067172991] [2021-05-06 07:07:36,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 07:07:36,796 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:36,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 07:07:36,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:07:36,797 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 07:07:36,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:36,858 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2021-05-06 07:07:36,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 07:07:36,859 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 32 [2021-05-06 07:07:36,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:36,860 INFO L225 Difference]: With dead ends: 42 [2021-05-06 07:07:36,860 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 07:07:36,860 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 36.1ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 07:07:36,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 07:07:36,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-06 07:07:36,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 07:07:36,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2021-05-06 07:07:36,863 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 32 [2021-05-06 07:07:36,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:36,863 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2021-05-06 07:07:36,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 07:07:36,864 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2021-05-06 07:07:36,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 07:07:36,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:36,864 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:37,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:37,069 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:37,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:37,069 INFO L82 PathProgramCache]: Analyzing trace with hash 50907356, now seen corresponding path program 3 times [2021-05-06 07:07:37,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:37,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089281450] [2021-05-06 07:07:37,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:37,076 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:37,076 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [554603449] [2021-05-06 07:07:37,076 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:37,183 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 07:07:37,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:37,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-06 07:07:37,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:37,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:37,388 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 16 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-06 07:07:37,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:37,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089281450] [2021-05-06 07:07:37,389 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:37,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554603449] [2021-05-06 07:07:37,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554603449] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:37,389 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:37,389 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 07:07:37,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811624061] [2021-05-06 07:07:37,390 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 07:07:37,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:37,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 07:07:37,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-06 07:07:37,390 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 11 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 07:07:37,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:37,518 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2021-05-06 07:07:37,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 07:07:37,519 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 38 [2021-05-06 07:07:37,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:37,521 INFO L225 Difference]: With dead ends: 45 [2021-05-06 07:07:37,522 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 07:07:37,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 106.8ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 07:07:37,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 07:07:37,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-06 07:07:37,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 07:07:37,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-05-06 07:07:37,534 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 38 [2021-05-06 07:07:37,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:37,534 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-05-06 07:07:37,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 07:07:37,534 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-05-06 07:07:37,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 07:07:37,535 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:37,535 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:37,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 07:07:37,745 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:37,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:37,746 INFO L82 PathProgramCache]: Analyzing trace with hash -1214637171, now seen corresponding path program 4 times [2021-05-06 07:07:37,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:37,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700228613] [2021-05-06 07:07:37,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:37,758 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:37,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1284771123] [2021-05-06 07:07:37,758 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 07:07:38,008 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 07:07:38,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:38,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 07:07:38,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:38,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,181 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 07:07:38,181 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:38,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700228613] [2021-05-06 07:07:38,181 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:38,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284771123] [2021-05-06 07:07:38,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284771123] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:38,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:38,182 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 07:07:38,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431646446] [2021-05-06 07:07:38,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 07:07:38,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:38,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 07:07:38,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-06 07:07:38,183 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 07:07:38,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:38,286 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-05-06 07:07:38,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 07:07:38,286 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 45 [2021-05-06 07:07:38,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:38,287 INFO L225 Difference]: With dead ends: 48 [2021-05-06 07:07:38,287 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 07:07:38,288 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 80.2ms TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-06 07:07:38,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 07:07:38,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 07:07:38,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 07:07:38,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-06 07:07:38,294 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 45 [2021-05-06 07:07:38,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:38,294 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-06 07:07:38,295 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 07:07:38,295 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-06 07:07:38,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 07:07:38,295 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:38,295 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:38,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-06 07:07:38,496 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:38,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:38,497 INFO L82 PathProgramCache]: Analyzing trace with hash -520581188, now seen corresponding path program 5 times [2021-05-06 07:07:38,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:38,497 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592748209] [2021-05-06 07:07:38,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:38,504 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:38,504 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2050739551] [2021-05-06 07:07:38,505 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 07:07:38,684 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-06 07:07:38,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:38,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 07:07:38,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:38,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:38,935 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 07:07:38,935 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:38,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592748209] [2021-05-06 07:07:38,935 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:38,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050739551] [2021-05-06 07:07:38,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050739551] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:38,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:38,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 07:07:38,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682631983] [2021-05-06 07:07:38,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 07:07:38,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:38,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 07:07:38,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-05-06 07:07:38,937 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 07:07:39,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:39,054 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2021-05-06 07:07:39,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 07:07:39,055 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 52 [2021-05-06 07:07:39,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:39,056 INFO L225 Difference]: With dead ends: 51 [2021-05-06 07:07:39,056 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 07:07:39,056 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 94.0ms TimeCoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-05-06 07:07:39,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 07:07:39,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-06 07:07:39,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 07:07:39,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2021-05-06 07:07:39,060 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 52 [2021-05-06 07:07:39,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:39,060 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2021-05-06 07:07:39,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 07:07:39,060 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2021-05-06 07:07:39,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 07:07:39,061 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:39,061 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:39,273 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:39,274 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:39,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:39,274 INFO L82 PathProgramCache]: Analyzing trace with hash 747034797, now seen corresponding path program 6 times [2021-05-06 07:07:39,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:39,274 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063291328] [2021-05-06 07:07:39,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:39,280 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:39,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1269352370] [2021-05-06 07:07:39,281 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:39,557 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-06 07:07:39,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:39,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-06 07:07:39,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:39,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:39,813 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 63 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-05-06 07:07:39,813 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:39,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063291328] [2021-05-06 07:07:39,814 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:39,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269352370] [2021-05-06 07:07:39,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269352370] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:39,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:39,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 07:07:39,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128369059] [2021-05-06 07:07:39,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 07:07:39,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:39,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 07:07:39,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-05-06 07:07:39,816 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 07:07:39,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:39,948 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2021-05-06 07:07:39,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 07:07:39,949 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 59 [2021-05-06 07:07:39,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:39,950 INFO L225 Difference]: With dead ends: 54 [2021-05-06 07:07:39,950 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 07:07:39,950 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 111.6ms TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-05-06 07:07:39,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 07:07:39,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-06 07:07:39,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 11 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 07:07:39,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2021-05-06 07:07:39,953 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 59 [2021-05-06 07:07:39,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:39,954 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2021-05-06 07:07:39,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 07:07:39,954 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2021-05-06 07:07:39,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 07:07:39,961 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:39,962 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:40,162 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 07:07:40,163 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:40,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:40,163 INFO L82 PathProgramCache]: Analyzing trace with hash -2066559332, now seen corresponding path program 7 times [2021-05-06 07:07:40,163 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:40,163 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324680950] [2021-05-06 07:07:40,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:40,169 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:40,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1888890789] [2021-05-06 07:07:40,170 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:40,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:40,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-06 07:07:40,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:40,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:40,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:40,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:40,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:40,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:40,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:40,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:40,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:40,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:40,859 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 07:07:40,859 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:40,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324680950] [2021-05-06 07:07:40,859 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:40,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888890789] [2021-05-06 07:07:40,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888890789] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:40,860 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:40,860 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 07:07:40,860 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147231949] [2021-05-06 07:07:40,860 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 07:07:40,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:40,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 07:07:40,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-05-06 07:07:40,861 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 10 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 07:07:41,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:41,012 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2021-05-06 07:07:41,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 07:07:41,013 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 10 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 66 [2021-05-06 07:07:41,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:41,015 INFO L225 Difference]: With dead ends: 57 [2021-05-06 07:07:41,015 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 07:07:41,016 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 116.5ms TimeCoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-06 07:07:41,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 07:07:41,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-06 07:07:41,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 12 states have call successors, (12), 7 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 07:07:41,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2021-05-06 07:07:41,021 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 66 [2021-05-06 07:07:41,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:41,021 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2021-05-06 07:07:41,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 states have internal predecessors, (25), 10 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 07:07:41,021 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2021-05-06 07:07:41,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 07:07:41,022 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:41,022 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:41,224 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 07:07:41,225 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:41,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:41,225 INFO L82 PathProgramCache]: Analyzing trace with hash -850256435, now seen corresponding path program 8 times [2021-05-06 07:07:41,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:41,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96015851] [2021-05-06 07:07:41,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:41,232 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:41,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [213793891] [2021-05-06 07:07:41,232 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:41,582 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 07:07:41,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:41,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-06 07:07:41,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:41,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:41,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:41,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:41,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:41,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:41,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:41,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:41,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:41,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:41,857 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 18 proven. 108 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 07:07:41,857 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:41,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96015851] [2021-05-06 07:07:41,857 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:41,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213793891] [2021-05-06 07:07:41,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213793891] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:41,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:41,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 07:07:41,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734771535] [2021-05-06 07:07:41,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 07:07:41,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:41,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 07:07:41,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2021-05-06 07:07:41,858 INFO L87 Difference]: Start difference. First operand 54 states and 59 transitions. Second operand has 14 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 07:07:42,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:42,032 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2021-05-06 07:07:42,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 07:07:42,033 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 73 [2021-05-06 07:07:42,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:42,034 INFO L225 Difference]: With dead ends: 60 [2021-05-06 07:07:42,034 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 07:07:42,034 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 134.6ms TimeCoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-05-06 07:07:42,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 07:07:42,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-06 07:07:42,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 13 states have call successors, (13), 7 states have call predecessors, (13), 5 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 07:07:42,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2021-05-06 07:07:42,038 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 73 [2021-05-06 07:07:42,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:42,038 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2021-05-06 07:07:42,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 07:07:42,038 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2021-05-06 07:07:42,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 07:07:42,039 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:42,039 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:42,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:42,248 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:42,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:42,249 INFO L82 PathProgramCache]: Analyzing trace with hash 652576124, now seen corresponding path program 9 times [2021-05-06 07:07:42,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:42,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288334544] [2021-05-06 07:07:42,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:42,264 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:42,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [360485827] [2021-05-06 07:07:42,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:42,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 07:07:42,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:42,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-06 07:07:42,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:42,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:42,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:42,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:42,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:42,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:42,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:42,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:42,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:42,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:42,916 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-06 07:07:42,916 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:42,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288334544] [2021-05-06 07:07:42,917 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:42,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360485827] [2021-05-06 07:07:42,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360485827] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:42,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:42,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-06 07:07:42,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189472768] [2021-05-06 07:07:42,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 07:07:42,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:42,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 07:07:42,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-05-06 07:07:42,918 INFO L87 Difference]: Start difference. First operand 57 states and 63 transitions. Second operand has 15 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 12 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 07:07:43,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:43,090 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2021-05-06 07:07:43,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 07:07:43,091 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 12 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 80 [2021-05-06 07:07:43,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:43,092 INFO L225 Difference]: With dead ends: 63 [2021-05-06 07:07:43,092 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 07:07:43,092 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 145.8ms TimeCoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2021-05-06 07:07:43,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 07:07:43,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-06 07:07:43,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 14 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 07:07:43,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2021-05-06 07:07:43,095 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 80 [2021-05-06 07:07:43,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:43,096 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2021-05-06 07:07:43,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 12 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 07:07:43,096 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2021-05-06 07:07:43,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 07:07:43,096 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:43,097 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:43,303 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 07:07:43,303 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:43,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:43,304 INFO L82 PathProgramCache]: Analyzing trace with hash 233695981, now seen corresponding path program 10 times [2021-05-06 07:07:43,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:43,304 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291720580] [2021-05-06 07:07:43,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:43,312 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:43,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1974870625] [2021-05-06 07:07:43,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:44,215 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 07:07:44,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:44,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-06 07:07:44,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:44,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:44,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:44,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:44,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:44,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:44,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:44,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:44,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:44,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:44,513 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 22 proven. 165 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-05-06 07:07:44,514 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:44,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291720580] [2021-05-06 07:07:44,514 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:44,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974870625] [2021-05-06 07:07:44,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974870625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:44,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:44,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-06 07:07:44,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020821557] [2021-05-06 07:07:44,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 07:07:44,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:44,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 07:07:44,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2021-05-06 07:07:44,516 INFO L87 Difference]: Start difference. First operand 60 states and 67 transitions. Second operand has 16 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 13 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 07:07:44,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:44,720 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2021-05-06 07:07:44,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 07:07:44,720 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 13 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 87 [2021-05-06 07:07:44,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:44,721 INFO L225 Difference]: With dead ends: 66 [2021-05-06 07:07:44,721 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 07:07:44,721 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 161.0ms TimeCoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-05-06 07:07:44,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 07:07:44,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-06 07:07:44,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 15 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 07:07:44,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-05-06 07:07:44,725 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 87 [2021-05-06 07:07:44,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:44,725 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-05-06 07:07:44,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 13 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 07:07:44,726 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-05-06 07:07:44,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 07:07:44,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:44,726 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:44,927 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:44,927 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:44,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:44,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1593750620, now seen corresponding path program 11 times [2021-05-06 07:07:44,928 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:44,928 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613091607] [2021-05-06 07:07:44,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:44,932 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:44,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1099229490] [2021-05-06 07:07:44,933 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:07:45,170 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-06 07:07:45,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:07:45,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-06 07:07:45,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:45,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:45,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:45,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:45,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:45,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:45,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:45,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:45,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:45,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:45,484 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 24 proven. 198 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-05-06 07:07:45,485 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:45,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613091607] [2021-05-06 07:07:45,485 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:45,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099229490] [2021-05-06 07:07:45,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099229490] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:45,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:45,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-06 07:07:45,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553740312] [2021-05-06 07:07:45,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 07:07:45,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:45,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 07:07:45,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2021-05-06 07:07:45,486 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 14 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 07:07:45,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:45,702 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2021-05-06 07:07:45,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 07:07:45,702 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 14 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 94 [2021-05-06 07:07:45,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:45,703 INFO L225 Difference]: With dead ends: 69 [2021-05-06 07:07:45,703 INFO L226 Difference]: Without dead ends: 66 [2021-05-06 07:07:45,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 155.1ms TimeCoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-05-06 07:07:45,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-06 07:07:45,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-05-06 07:07:45,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 16 states have call successors, (16), 7 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 07:07:45,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 75 transitions. [2021-05-06 07:07:45,707 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 75 transitions. Word has length 94 [2021-05-06 07:07:45,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:45,708 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 75 transitions. [2021-05-06 07:07:45,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 14 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 07:07:45,708 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 75 transitions. [2021-05-06 07:07:45,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 07:07:45,709 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:45,709 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:45,913 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-06 07:07:45,914 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:45,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:45,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1832108019, now seen corresponding path program 12 times [2021-05-06 07:07:45,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:45,914 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213364780] [2021-05-06 07:07:45,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:45,922 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:45,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [154275268] [2021-05-06 07:07:45,922 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true