/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 07:23:20,142 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 07:23:20,144 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 07:23:20,180 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 07:23:20,201 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 07:23:20,201 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 07:23:20,202 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 07:23:20,203 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 07:23:20,203 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 07:23:20,204 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 07:23:20,205 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 07:23:20,206 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 07:23:20,207 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 07:23:20,221 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 07:23:20,222 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 07:23:20,223 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 07:23:20,224 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 07:23:20,230 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 07:23:20,230 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 07:23:20,231 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 07:23:20,232 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 07:23:20,240 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 07:23:20,241 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 07:23:20,241 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 07:23:20,276 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 07:23:20,276 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 07:23:20,276 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 07:23:20,276 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 07:23:20,276 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 07:23:20,276 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 07:23:20,277 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 07:23:20,277 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 07:23:20,277 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 07:23:20,277 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 07:23:20,277 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 07:23:20,277 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 07:23:20,277 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 07:23:20,277 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 07:23:20,277 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 07:23:20,277 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 07:23:20,278 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 07:23:20,278 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 07:23:20,279 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 07:23:20,279 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 07:23:20,594 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 07:23:20,612 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 07:23:20,614 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 07:23:20,615 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 07:23:20,629 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 07:23:20,630 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound20.c [2021-05-06 07:23:20,678 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76b063438/ee7ab9dca29143cf920921ec9a402eb1/FLAGbded82005 [2021-05-06 07:23:21,030 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 07:23:21,031 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound20.c [2021-05-06 07:23:21,036 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76b063438/ee7ab9dca29143cf920921ec9a402eb1/FLAGbded82005 [2021-05-06 07:23:21,052 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76b063438/ee7ab9dca29143cf920921ec9a402eb1 [2021-05-06 07:23:21,054 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 07:23:21,055 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 07:23:21,058 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 07:23:21,058 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 07:23:21,061 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 07:23:21,061 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,062 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17bca2d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21, skipping insertion in model container [2021-05-06 07:23:21,063 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,068 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 07:23:21,079 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 07:23:21,192 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound20.c[576,589] [2021-05-06 07:23:21,205 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 07:23:21,212 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 07:23:21,221 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound20.c[576,589] [2021-05-06 07:23:21,235 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 07:23:21,257 INFO L208 MainTranslator]: Completed translation [2021-05-06 07:23:21,257 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21 WrapperNode [2021-05-06 07:23:21,258 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 07:23:21,260 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 07:23:21,260 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 07:23:21,260 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 07:23:21,268 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,270 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,287 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,287 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,297 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,300 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,304 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,308 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 07:23:21,308 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 07:23:21,309 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 07:23:21,309 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 07:23:21,310 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21" (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 07:23:21,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 07:23:21,362 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 07:23:21,362 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 07:23:21,362 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 07:23:21,362 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 07:23:21,362 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 07:23:21,362 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 07:23:21,362 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 07:23:21,363 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 07:23:21,363 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 07:23:21,363 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 07:23:21,363 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 07:23:21,363 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 07:23:21,363 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 07:23:21,364 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 07:23:21,364 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 07:23:21,364 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 07:23:21,364 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 07:23:21,364 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 07:23:21,365 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 07:23:21,644 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 07:23:21,645 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 07:23:21,646 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:23:21 BoogieIcfgContainer [2021-05-06 07:23:21,646 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 07:23:21,646 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 07:23:21,646 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 07:23:21,647 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 07:23:21,648 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:23:21" (1/1) ... [2021-05-06 07:23:21,674 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 07:23:21 BasicIcfg [2021-05-06 07:23:21,674 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 07:23:21,675 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 07:23:21,675 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 07:23:21,677 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 07:23:21,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 07:23:21" (1/4) ... [2021-05-06 07:23:21,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fa1b486 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 07:23:21, skipping insertion in model container [2021-05-06 07:23:21,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:23:21" (2/4) ... [2021-05-06 07:23:21,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fa1b486 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 07:23:21, skipping insertion in model container [2021-05-06 07:23:21,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:23:21" (3/4) ... [2021-05-06 07:23:21,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fa1b486 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 07:23:21, skipping insertion in model container [2021-05-06 07:23:21,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 07:23:21" (4/4) ... [2021-05-06 07:23:21,679 INFO L111 eAbstractionObserver]: Analyzing ICFG cohendiv-ll_unwindbound20.cJordan [2021-05-06 07:23:21,682 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 07:23:21,692 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 07:23:21,702 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 07:23:21,723 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 07:23:21,723 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 07:23:21,723 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 07:23:21,724 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 07:23:21,724 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 07:23:21,724 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 07:23:21,724 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 07:23:21,724 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 07:23:21,738 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 23 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 07:23:21,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 07:23:21,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:21,743 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:21,744 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:21,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:21,747 INFO L82 PathProgramCache]: Analyzing trace with hash 1213541379, now seen corresponding path program 1 times [2021-05-06 07:23:21,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:21,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400971201] [2021-05-06 07:23:21,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:21,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:21,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 07:23:21,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:21,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 07:23:21,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:22,002 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 07:23:22,002 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:22,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400971201] [2021-05-06 07:23:22,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400971201] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:23:22,003 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:23:22,004 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 07:23:22,004 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545618543] [2021-05-06 07:23:22,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 07:23:22,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:22,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 07:23:22,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 07:23:22,020 INFO L87 Difference]: Start difference. First operand has 38 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 23 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:23:22,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:22,202 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2021-05-06 07:23:22,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 07:23:22,203 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 07:23:22,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:22,209 INFO L225 Difference]: With dead ends: 39 [2021-05-06 07:23:22,209 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 07:23:22,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 07:23:22,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 07:23:22,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-06 07:23:22,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 07:23:22,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2021-05-06 07:23:22,249 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 17 [2021-05-06 07:23:22,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:22,250 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2021-05-06 07:23:22,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:23:22,250 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2021-05-06 07:23:22,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 07:23:22,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:22,250 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:22,251 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 07:23:22,251 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:22,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:22,251 INFO L82 PathProgramCache]: Analyzing trace with hash -1202035559, now seen corresponding path program 1 times [2021-05-06 07:23:22,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:22,252 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308829501] [2021-05-06 07:23:22,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:22,287 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:22,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1006326953] [2021-05-06 07:23:22,287 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 07:23:22,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:22,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 07:23:22,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:22,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:22,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:22,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:22,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:22,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:22,500 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 07:23:22,500 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:22,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308829501] [2021-05-06 07:23:22,516 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:22,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006326953] [2021-05-06 07:23:22,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1006326953] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:23:22,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:23:22,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 07:23:22,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701379967] [2021-05-06 07:23:22,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 07:23:22,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:22,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 07:23:22,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 07:23:22,518 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 07:23:22,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:22,535 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2021-05-06 07:23:22,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 07:23:22,537 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-06 07:23:22,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:22,537 INFO L225 Difference]: With dead ends: 35 [2021-05-06 07:23:22,537 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 07:23:22,538 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 07:23:22,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 07:23:22,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 07:23:22,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 07:23:22,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2021-05-06 07:23:22,542 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 18 [2021-05-06 07:23:22,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:22,542 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2021-05-06 07:23:22,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 07:23:22,543 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2021-05-06 07:23:22,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 07:23:22,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:22,543 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:22,763 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 07:23:22,764 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:22,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:22,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1200933292, now seen corresponding path program 1 times [2021-05-06 07:23:22,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:22,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491694969] [2021-05-06 07:23:22,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:22,773 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:22,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1787864832] [2021-05-06 07:23:22,773 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 07:23:22,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:22,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 07:23:22,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:22,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:22,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:22,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:22,961 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 07:23:22,961 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:22,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491694969] [2021-05-06 07:23:22,961 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:22,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787864832] [2021-05-06 07:23:22,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787864832] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:23:22,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:23:22,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 07:23:22,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438035469] [2021-05-06 07:23:22,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 07:23:22,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:22,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 07:23:22,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:23:22,963 INFO L87 Difference]: Start difference. First operand 35 states and 44 transitions. Second operand has 8 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:23:23,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:23,072 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2021-05-06 07:23:23,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 07:23:23,072 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-06 07:23:23,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:23,073 INFO L225 Difference]: With dead ends: 43 [2021-05-06 07:23:23,073 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 07:23:23,073 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 53.7ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 07:23:23,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 07:23:23,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-05-06 07:23:23,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 26 states have internal predecessors, (29), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 07:23:23,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2021-05-06 07:23:23,079 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 18 [2021-05-06 07:23:23,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:23,080 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2021-05-06 07:23:23,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:23:23,080 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2021-05-06 07:23:23,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 07:23:23,100 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:23,100 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:23,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:23,313 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:23,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:23,313 INFO L82 PathProgramCache]: Analyzing trace with hash -944097291, now seen corresponding path program 1 times [2021-05-06 07:23:23,314 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:23,314 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372506307] [2021-05-06 07:23:23,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:23,334 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:23,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [795874739] [2021-05-06 07:23:23,334 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 07:23:23,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:23,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 07:23:23,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:23,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:23,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:23,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:23,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:23,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:23,510 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 07:23:23,510 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:23,510 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372506307] [2021-05-06 07:23:23,511 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:23,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795874739] [2021-05-06 07:23:23,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795874739] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:23:23,511 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:23:23,511 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 07:23:23,511 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090875026] [2021-05-06 07:23:23,511 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 07:23:23,511 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:23,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 07:23:23,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:23:23,512 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 07:23:23,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:23,639 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2021-05-06 07:23:23,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 07:23:23,640 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-06 07:23:23,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:23,644 INFO L225 Difference]: With dead ends: 56 [2021-05-06 07:23:23,644 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 07:23:23,646 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 57.8ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 07:23:23,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 07:23:23,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-06 07:23:23,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 32 states have (on average 1.21875) internal successors, (39), 33 states have internal predecessors, (39), 16 states have call successors, (16), 6 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 07:23:23,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-05-06 07:23:23,659 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 23 [2021-05-06 07:23:23,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:23,660 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-05-06 07:23:23,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 07:23:23,660 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-05-06 07:23:23,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 07:23:23,661 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:23,661 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:23,877 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:23,878 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:23,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:23,878 INFO L82 PathProgramCache]: Analyzing trace with hash -653220550, now seen corresponding path program 1 times [2021-05-06 07:23:23,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:23,879 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517382036] [2021-05-06 07:23:23,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:23,887 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:23,887 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1068536243] [2021-05-06 07:23:23,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:23,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:23,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 07:23:23,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:24,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,019 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 07:23:24,019 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:24,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517382036] [2021-05-06 07:23:24,020 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:24,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068536243] [2021-05-06 07:23:24,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068536243] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:23:24,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:23:24,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 07:23:24,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073626664] [2021-05-06 07:23:24,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 07:23:24,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:24,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 07:23:24,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 07:23:24,021 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 07:23:24,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:24,075 INFO L93 Difference]: Finished difference Result 81 states and 111 transitions. [2021-05-06 07:23:24,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 07:23:24,076 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 31 [2021-05-06 07:23:24,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:24,077 INFO L225 Difference]: With dead ends: 81 [2021-05-06 07:23:24,077 INFO L226 Difference]: Without dead ends: 81 [2021-05-06 07:23:24,077 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 07:23:24,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-06 07:23:24,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 74. [2021-05-06 07:23:24,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 44 states have (on average 1.2727272727272727) internal successors, (56), 46 states have internal predecessors, (56), 23 states have call successors, (23), 7 states have call predecessors, (23), 6 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 07:23:24,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 100 transitions. [2021-05-06 07:23:24,084 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 100 transitions. Word has length 31 [2021-05-06 07:23:24,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:24,085 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 100 transitions. [2021-05-06 07:23:24,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 07:23:24,085 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 100 transitions. [2021-05-06 07:23:24,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 07:23:24,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:24,086 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:24,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:24,288 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:24,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:24,290 INFO L82 PathProgramCache]: Analyzing trace with hash -830156892, now seen corresponding path program 1 times [2021-05-06 07:23:24,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:24,291 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767576776] [2021-05-06 07:23:24,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:24,307 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:24,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1235084567] [2021-05-06 07:23:24,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:24,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:24,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 07:23:24,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:24,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,484 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 07:23:24,484 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:24,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767576776] [2021-05-06 07:23:24,484 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:24,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235084567] [2021-05-06 07:23:24,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235084567] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:23:24,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:23:24,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 07:23:24,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372710649] [2021-05-06 07:23:24,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 07:23:24,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:24,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 07:23:24,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 07:23:24,486 INFO L87 Difference]: Start difference. First operand 74 states and 100 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 07:23:24,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:24,516 INFO L93 Difference]: Finished difference Result 78 states and 102 transitions. [2021-05-06 07:23:24,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 07:23:24,517 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 34 [2021-05-06 07:23:24,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:24,518 INFO L225 Difference]: With dead ends: 78 [2021-05-06 07:23:24,518 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 07:23:24,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 10.1ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 07:23:24,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 07:23:24,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-06 07:23:24,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 49 states have internal predecessors, (58), 23 states have call successors, (23), 8 states have call predecessors, (23), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 07:23:24,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 102 transitions. [2021-05-06 07:23:24,524 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 102 transitions. Word has length 34 [2021-05-06 07:23:24,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:24,524 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 102 transitions. [2021-05-06 07:23:24,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 07:23:24,524 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 102 transitions. [2021-05-06 07:23:24,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 07:23:24,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:24,525 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:24,739 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-06 07:23:24,739 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:24,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:24,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1527688582, now seen corresponding path program 1 times [2021-05-06 07:23:24,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:24,740 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75730923] [2021-05-06 07:23:24,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:24,748 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:24,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [638855454] [2021-05-06 07:23:24,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:24,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:24,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 07:23:24,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:24,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:24,890 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-06 07:23:24,890 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:24,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75730923] [2021-05-06 07:23:24,891 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:24,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638855454] [2021-05-06 07:23:24,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638855454] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:23:24,891 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:23:24,891 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 07:23:24,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101821621] [2021-05-06 07:23:24,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 07:23:24,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:24,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 07:23:24,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:23:24,893 INFO L87 Difference]: Start difference. First operand 78 states and 102 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 07:23:24,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:24,957 INFO L93 Difference]: Finished difference Result 82 states and 105 transitions. [2021-05-06 07:23:24,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 07:23:24,957 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 41 [2021-05-06 07:23:24,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:24,958 INFO L225 Difference]: With dead ends: 82 [2021-05-06 07:23:24,958 INFO L226 Difference]: Without dead ends: 82 [2021-05-06 07:23:24,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 37.3ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-06 07:23:24,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-06 07:23:24,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-06 07:23:24,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 50 states have (on average 1.22) internal successors, (61), 52 states have internal predecessors, (61), 23 states have call successors, (23), 9 states have call predecessors, (23), 8 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 07:23:24,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 105 transitions. [2021-05-06 07:23:24,963 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 105 transitions. Word has length 41 [2021-05-06 07:23:24,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:24,964 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 105 transitions. [2021-05-06 07:23:24,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 07:23:24,964 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 105 transitions. [2021-05-06 07:23:24,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 07:23:24,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:24,965 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:25,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:25,182 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:25,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:25,182 INFO L82 PathProgramCache]: Analyzing trace with hash 800232443, now seen corresponding path program 1 times [2021-05-06 07:23:25,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:25,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659467474] [2021-05-06 07:23:25,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:25,190 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:25,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1518724231] [2021-05-06 07:23:25,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:25,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:25,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 07:23:25,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:25,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,412 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-06 07:23:25,412 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:25,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659467474] [2021-05-06 07:23:25,413 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:25,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518724231] [2021-05-06 07:23:25,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518724231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:25,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:25,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 07:23:25,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462088263] [2021-05-06 07:23:25,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 07:23:25,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:25,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 07:23:25,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:23:25,414 INFO L87 Difference]: Start difference. First operand 82 states and 105 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-06 07:23:25,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:25,517 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2021-05-06 07:23:25,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 07:23:25,518 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2021-05-06 07:23:25,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:25,519 INFO L225 Difference]: With dead ends: 86 [2021-05-06 07:23:25,519 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 07:23:25,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 52.7ms TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-06 07:23:25,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 07:23:25,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-05-06 07:23:25,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 55 states have internal predecessors, (64), 23 states have call successors, (23), 10 states have call predecessors, (23), 9 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 07:23:25,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 108 transitions. [2021-05-06 07:23:25,525 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 108 transitions. Word has length 47 [2021-05-06 07:23:25,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:25,525 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 108 transitions. [2021-05-06 07:23:25,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-06 07:23:25,526 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 108 transitions. [2021-05-06 07:23:25,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 07:23:25,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:25,527 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:25,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:25,748 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:25,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:25,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1984817020, now seen corresponding path program 1 times [2021-05-06 07:23:25,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:25,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333870112] [2021-05-06 07:23:25,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:25,758 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:25,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1324255019] [2021-05-06 07:23:25,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:25,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:25,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 07:23:25,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:25,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:25,982 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 07:23:25,982 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:25,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333870112] [2021-05-06 07:23:25,982 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:25,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324255019] [2021-05-06 07:23:25,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324255019] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:25,982 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:25,982 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 07:23:25,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376831291] [2021-05-06 07:23:25,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 07:23:25,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:25,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 07:23:25,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 07:23:25,984 INFO L87 Difference]: Start difference. First operand 86 states and 108 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-06 07:23:26,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:26,057 INFO L93 Difference]: Finished difference Result 108 states and 127 transitions. [2021-05-06 07:23:26,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 07:23:26,057 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 50 [2021-05-06 07:23:26,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:26,058 INFO L225 Difference]: With dead ends: 108 [2021-05-06 07:23:26,058 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 07:23:26,059 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 15.5ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:23:26,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 07:23:26,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2021-05-06 07:23:26,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 68 states have (on average 1.161764705882353) internal successors, (79), 71 states have internal predecessors, (79), 24 states have call successors, (24), 14 states have call predecessors, (24), 13 states have return successors, (22), 20 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-06 07:23:26,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 125 transitions. [2021-05-06 07:23:26,074 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 125 transitions. Word has length 50 [2021-05-06 07:23:26,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:26,075 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 125 transitions. [2021-05-06 07:23:26,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-06 07:23:26,075 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 125 transitions. [2021-05-06 07:23:26,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 07:23:26,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:26,076 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:26,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-06 07:23:26,276 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:26,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:26,277 INFO L82 PathProgramCache]: Analyzing trace with hash 960315114, now seen corresponding path program 1 times [2021-05-06 07:23:26,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:26,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594707325] [2021-05-06 07:23:26,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:26,284 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:26,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [430799615] [2021-05-06 07:23:26,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:26,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:26,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 07:23:26,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:26,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,454 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 07:23:26,455 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:26,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594707325] [2021-05-06 07:23:26,455 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:26,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430799615] [2021-05-06 07:23:26,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430799615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:26,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:26,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 07:23:26,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320553270] [2021-05-06 07:23:26,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 07:23:26,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:26,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 07:23:26,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:23:26,456 INFO L87 Difference]: Start difference. First operand 106 states and 125 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 07:23:26,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:26,568 INFO L93 Difference]: Finished difference Result 132 states and 164 transitions. [2021-05-06 07:23:26,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 07:23:26,568 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 55 [2021-05-06 07:23:26,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:26,570 INFO L225 Difference]: With dead ends: 132 [2021-05-06 07:23:26,570 INFO L226 Difference]: Without dead ends: 131 [2021-05-06 07:23:26,570 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 29.1ms TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:23:26,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-06 07:23:26,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 127. [2021-05-06 07:23:26,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 79 states have (on average 1.1898734177215189) internal successors, (94), 82 states have internal predecessors, (94), 33 states have call successors, (33), 15 states have call predecessors, (33), 14 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 07:23:26,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 158 transitions. [2021-05-06 07:23:26,577 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 158 transitions. Word has length 55 [2021-05-06 07:23:26,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:26,577 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 158 transitions. [2021-05-06 07:23:26,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 07:23:26,577 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 158 transitions. [2021-05-06 07:23:26,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 07:23:26,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:26,578 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:26,799 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:26,799 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:26,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:26,799 INFO L82 PathProgramCache]: Analyzing trace with hash 1119467195, now seen corresponding path program 1 times [2021-05-06 07:23:26,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:26,800 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392411120] [2021-05-06 07:23:26,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:26,807 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:26,807 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [34025055] [2021-05-06 07:23:26,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:26,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:26,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 07:23:26,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:26,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:26,948 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 14 proven. 34 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-06 07:23:26,948 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:26,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392411120] [2021-05-06 07:23:26,948 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:26,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34025055] [2021-05-06 07:23:26,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34025055] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:26,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:26,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 07:23:26,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491002165] [2021-05-06 07:23:26,950 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 07:23:26,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:26,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 07:23:26,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 07:23:26,951 INFO L87 Difference]: Start difference. First operand 127 states and 158 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 07:23:27,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:27,015 INFO L93 Difference]: Finished difference Result 130 states and 161 transitions. [2021-05-06 07:23:27,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 07:23:27,016 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 58 [2021-05-06 07:23:27,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:27,017 INFO L225 Difference]: With dead ends: 130 [2021-05-06 07:23:27,017 INFO L226 Difference]: Without dead ends: 130 [2021-05-06 07:23:27,017 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 14.8ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:23:27,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-06 07:23:27,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2021-05-06 07:23:27,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 82 states have (on average 1.1829268292682926) internal successors, (97), 84 states have internal predecessors, (97), 33 states have call successors, (33), 15 states have call predecessors, (33), 14 states have return successors, (31), 30 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 07:23:27,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 161 transitions. [2021-05-06 07:23:27,028 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 161 transitions. Word has length 58 [2021-05-06 07:23:27,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:27,029 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 161 transitions. [2021-05-06 07:23:27,029 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 07:23:27,029 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 161 transitions. [2021-05-06 07:23:27,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 07:23:27,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:27,032 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:27,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:27,249 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:27,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:27,250 INFO L82 PathProgramCache]: Analyzing trace with hash -469414513, now seen corresponding path program 1 times [2021-05-06 07:23:27,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:27,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168026299] [2021-05-06 07:23:27,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:27,257 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:27,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1666071474] [2021-05-06 07:23:27,257 INFO L95 rtionOrderModulation]: Keeping assertion order 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 07:23:27,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:27,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-06 07:23:27,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:27,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,428 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-05-06 07:23:27,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:27,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168026299] [2021-05-06 07:23:27,428 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:27,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666071474] [2021-05-06 07:23:27,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666071474] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:23:27,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:23:27,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 07:23:27,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827416119] [2021-05-06 07:23:27,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 07:23:27,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:27,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 07:23:27,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 07:23:27,430 INFO L87 Difference]: Start difference. First operand 130 states and 161 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 07:23:27,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:27,470 INFO L93 Difference]: Finished difference Result 129 states and 154 transitions. [2021-05-06 07:23:27,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 07:23:27,471 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 66 [2021-05-06 07:23:27,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:27,471 INFO L225 Difference]: With dead ends: 129 [2021-05-06 07:23:27,471 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 07:23:27,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 14.5ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 07:23:27,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 07:23:27,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 112. [2021-05-06 07:23:27,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 72 states have (on average 1.1527777777777777) internal successors, (83), 74 states have internal predecessors, (83), 26 states have call successors, (26), 14 states have call predecessors, (26), 13 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-06 07:23:27,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 133 transitions. [2021-05-06 07:23:27,475 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 133 transitions. Word has length 66 [2021-05-06 07:23:27,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:27,476 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 133 transitions. [2021-05-06 07:23:27,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 07:23:27,476 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 133 transitions. [2021-05-06 07:23:27,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 07:23:27,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:27,477 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:27,696 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-06 07:23:27,696 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:27,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:27,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1669598821, now seen corresponding path program 1 times [2021-05-06 07:23:27,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:27,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984964815] [2021-05-06 07:23:27,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:27,703 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:27,703 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1866680643] [2021-05-06 07:23:27,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:27,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:27,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 07:23:27,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:27,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:27,876 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 18 proven. 112 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 07:23:27,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:27,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984964815] [2021-05-06 07:23:27,877 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:27,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866680643] [2021-05-06 07:23:27,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866680643] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:27,877 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:27,877 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 07:23:27,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197306172] [2021-05-06 07:23:27,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 07:23:27,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:27,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 07:23:27,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:23:27,879 INFO L87 Difference]: Start difference. First operand 112 states and 133 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (13), 6 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-06 07:23:27,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:27,942 INFO L93 Difference]: Finished difference Result 134 states and 157 transitions. [2021-05-06 07:23:27,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 07:23:27,942 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (13), 6 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) Word has length 74 [2021-05-06 07:23:27,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:27,945 INFO L225 Difference]: With dead ends: 134 [2021-05-06 07:23:27,945 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 07:23:27,946 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 20.0ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:23:27,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 07:23:27,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 132. [2021-05-06 07:23:27,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 85 states have (on average 1.1411764705882352) internal successors, (97), 88 states have internal predecessors, (97), 30 states have call successors, (30), 17 states have call predecessors, (30), 16 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-06 07:23:27,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 155 transitions. [2021-05-06 07:23:27,958 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 155 transitions. Word has length 74 [2021-05-06 07:23:27,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:27,958 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 155 transitions. [2021-05-06 07:23:27,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (13), 6 states have call predecessors, (13), 4 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-06 07:23:27,959 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 155 transitions. [2021-05-06 07:23:27,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 07:23:27,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:27,960 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:28,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-06 07:23:28,182 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:28,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:28,182 INFO L82 PathProgramCache]: Analyzing trace with hash -286098381, now seen corresponding path program 1 times [2021-05-06 07:23:28,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:28,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815837381] [2021-05-06 07:23:28,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:28,195 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:28,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [373001466] [2021-05-06 07:23:28,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 07:23:28,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:28,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 07:23:28,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:28,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:28,849 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-06 07:23:28,849 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:28,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815837381] [2021-05-06 07:23:28,850 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:28,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373001466] [2021-05-06 07:23:28,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373001466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:28,850 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:28,850 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 07:23:28,850 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417987562] [2021-05-06 07:23:28,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 07:23:28,850 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:28,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 07:23:28,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-06 07:23:28,851 INFO L87 Difference]: Start difference. First operand 132 states and 155 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 9 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-06 07:23:29,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:29,025 INFO L93 Difference]: Finished difference Result 163 states and 198 transitions. [2021-05-06 07:23:29,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 07:23:29,026 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 9 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) Word has length 79 [2021-05-06 07:23:29,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:29,027 INFO L225 Difference]: With dead ends: 163 [2021-05-06 07:23:29,027 INFO L226 Difference]: Without dead ends: 162 [2021-05-06 07:23:29,027 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 65.2ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-06 07:23:29,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-06 07:23:29,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 157. [2021-05-06 07:23:29,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 99 states have (on average 1.1616161616161615) internal successors, (115), 102 states have internal predecessors, (115), 39 states have call successors, (39), 19 states have call predecessors, (39), 18 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 07:23:29,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 191 transitions. [2021-05-06 07:23:29,031 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 191 transitions. Word has length 79 [2021-05-06 07:23:29,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:29,032 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 191 transitions. [2021-05-06 07:23:29,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 9 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-06 07:23:29,032 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 191 transitions. [2021-05-06 07:23:29,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 07:23:29,032 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:29,032 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:29,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 07:23:29,252 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:29,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:29,252 INFO L82 PathProgramCache]: Analyzing trace with hash -792688430, now seen corresponding path program 2 times [2021-05-06 07:23:29,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:29,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323707538] [2021-05-06 07:23:29,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:29,258 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:29,259 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1836752357] [2021-05-06 07:23:29,259 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 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 07:23:29,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 07:23:29,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:23:29,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 07:23:29,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:29,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,428 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 140 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-05-06 07:23:29,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:29,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323707538] [2021-05-06 07:23:29,429 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:29,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836752357] [2021-05-06 07:23:29,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1836752357] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:29,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:29,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 07:23:29,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077902750] [2021-05-06 07:23:29,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 07:23:29,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:29,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 07:23:29,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:23:29,430 INFO L87 Difference]: Start difference. First operand 157 states and 191 transitions. Second operand has 7 states, 7 states have (on average 5.0) internal successors, (35), 6 states have internal predecessors, (35), 6 states have call successors, (14), 6 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-06 07:23:29,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:29,491 INFO L93 Difference]: Finished difference Result 160 states and 194 transitions. [2021-05-06 07:23:29,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 07:23:29,491 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.0) internal successors, (35), 6 states have internal predecessors, (35), 6 states have call successors, (14), 6 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) Word has length 82 [2021-05-06 07:23:29,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:29,492 INFO L225 Difference]: With dead ends: 160 [2021-05-06 07:23:29,492 INFO L226 Difference]: Without dead ends: 160 [2021-05-06 07:23:29,493 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 26.5ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 07:23:29,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-06 07:23:29,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2021-05-06 07:23:29,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 102 states have (on average 1.1568627450980393) internal successors, (118), 104 states have internal predecessors, (118), 39 states have call successors, (39), 19 states have call predecessors, (39), 18 states have return successors, (37), 36 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 07:23:29,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 194 transitions. [2021-05-06 07:23:29,498 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 194 transitions. Word has length 82 [2021-05-06 07:23:29,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:29,499 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 194 transitions. [2021-05-06 07:23:29,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.0) internal successors, (35), 6 states have internal predecessors, (35), 6 states have call successors, (14), 6 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-06 07:23:29,499 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 194 transitions. [2021-05-06 07:23:29,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-06 07:23:29,500 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:29,500 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:29,719 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:29,720 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:29,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:29,720 INFO L82 PathProgramCache]: Analyzing trace with hash -2126505818, now seen corresponding path program 1 times [2021-05-06 07:23:29,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:29,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207534289] [2021-05-06 07:23:29,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:29,725 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:29,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1392227085] [2021-05-06 07:23:29,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 07:23:29,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:23:29,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 07:23:29,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:29,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:29,933 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 27 proven. 191 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-06 07:23:29,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:29,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207534289] [2021-05-06 07:23:29,934 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:29,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392227085] [2021-05-06 07:23:29,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392227085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:29,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:29,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 07:23:29,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418693032] [2021-05-06 07:23:29,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 07:23:29,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:29,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 07:23:29,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:23:29,935 INFO L87 Difference]: Start difference. First operand 160 states and 194 transitions. Second operand has 8 states, 8 states have (on average 5.125) internal successors, (41), 7 states have internal predecessors, (41), 7 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) [2021-05-06 07:23:30,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:30,035 INFO L93 Difference]: Finished difference Result 186 states and 220 transitions. [2021-05-06 07:23:30,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 07:23:30,036 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 7 states have internal predecessors, (41), 7 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) Word has length 90 [2021-05-06 07:23:30,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:30,036 INFO L225 Difference]: With dead ends: 186 [2021-05-06 07:23:30,036 INFO L226 Difference]: Without dead ends: 186 [2021-05-06 07:23:30,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 35.0ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-06 07:23:30,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-05-06 07:23:30,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2021-05-06 07:23:30,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 118 states have (on average 1.1355932203389831) internal successors, (134), 120 states have internal predecessors, (134), 43 states have call successors, (43), 23 states have call predecessors, (43), 22 states have return successors, (41), 40 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-06 07:23:30,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 218 transitions. [2021-05-06 07:23:30,042 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 218 transitions. Word has length 90 [2021-05-06 07:23:30,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:30,042 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 218 transitions. [2021-05-06 07:23:30,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 7 states have internal predecessors, (41), 7 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) [2021-05-06 07:23:30,043 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 218 transitions. [2021-05-06 07:23:30,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 07:23:30,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:30,044 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:30,261 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 07:23:30,262 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:30,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:30,262 INFO L82 PathProgramCache]: Analyzing trace with hash -169757262, now seen corresponding path program 2 times [2021-05-06 07:23:30,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:30,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477721800] [2021-05-06 07:23:30,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:30,270 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:30,270 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [417232057] [2021-05-06 07:23:30,270 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:30,329 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 07:23:30,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:23:30,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 07:23:30,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:30,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:30,519 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 26 proven. 270 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-06 07:23:30,519 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:30,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477721800] [2021-05-06 07:23:30,519 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:30,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417232057] [2021-05-06 07:23:30,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417232057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:30,519 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:30,519 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 07:23:30,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68479985] [2021-05-06 07:23:30,520 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 07:23:30,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:30,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 07:23:30,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 07:23:30,520 INFO L87 Difference]: Start difference. First operand 184 states and 218 transitions. Second operand has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 7 states have call successors, (17), 7 states have call predecessors, (17), 5 states have return successors, (15), 5 states have call predecessors, (15), 6 states have call successors, (15) [2021-05-06 07:23:30,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:30,634 INFO L93 Difference]: Finished difference Result 187 states and 221 transitions. [2021-05-06 07:23:30,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 07:23:30,634 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 7 states have call successors, (17), 7 states have call predecessors, (17), 5 states have return successors, (15), 5 states have call predecessors, (15), 6 states have call successors, (15) Word has length 98 [2021-05-06 07:23:30,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:30,635 INFO L225 Difference]: With dead ends: 187 [2021-05-06 07:23:30,635 INFO L226 Difference]: Without dead ends: 187 [2021-05-06 07:23:30,635 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 43.9ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-06 07:23:30,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-06 07:23:30,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2021-05-06 07:23:30,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 121 states have (on average 1.1322314049586777) internal successors, (137), 123 states have internal predecessors, (137), 43 states have call successors, (43), 23 states have call predecessors, (43), 22 states have return successors, (41), 40 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-06 07:23:30,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 221 transitions. [2021-05-06 07:23:30,640 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 221 transitions. Word has length 98 [2021-05-06 07:23:30,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:30,640 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 221 transitions. [2021-05-06 07:23:30,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 7 states have call successors, (17), 7 states have call predecessors, (17), 5 states have return successors, (15), 5 states have call predecessors, (15), 6 states have call successors, (15) [2021-05-06 07:23:30,640 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 221 transitions. [2021-05-06 07:23:30,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 07:23:30,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:30,641 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:30,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 07:23:30,841 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:30,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:30,842 INFO L82 PathProgramCache]: Analyzing trace with hash 1237757564, now seen corresponding path program 2 times [2021-05-06 07:23:30,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:30,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978574573] [2021-05-06 07:23:30,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:30,847 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:30,847 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2109125509] [2021-05-06 07:23:30,847 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:30,905 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 07:23:30,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:23:30,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-06 07:23:30,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:31,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:31,091 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 28 proven. 24 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-05-06 07:23:31,091 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:31,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978574573] [2021-05-06 07:23:31,092 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:31,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109125509] [2021-05-06 07:23:31,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109125509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:31,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:31,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 07:23:31,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811545630] [2021-05-06 07:23:31,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 07:23:31,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:31,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 07:23:31,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-06 07:23:31,094 INFO L87 Difference]: Start difference. First operand 187 states and 221 transitions. Second operand has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-05-06 07:23:31,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:31,268 INFO L93 Difference]: Finished difference Result 217 states and 263 transitions. [2021-05-06 07:23:31,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 07:23:31,268 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 103 [2021-05-06 07:23:31,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:31,271 INFO L225 Difference]: With dead ends: 217 [2021-05-06 07:23:31,271 INFO L226 Difference]: Without dead ends: 216 [2021-05-06 07:23:31,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 46.9ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 07:23:31,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-06 07:23:31,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 212. [2021-05-06 07:23:31,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 135 states have (on average 1.1481481481481481) internal successors, (155), 137 states have internal predecessors, (155), 52 states have call successors, (52), 25 states have call predecessors, (52), 24 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-05-06 07:23:31,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 257 transitions. [2021-05-06 07:23:31,278 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 257 transitions. Word has length 103 [2021-05-06 07:23:31,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:31,279 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 257 transitions. [2021-05-06 07:23:31,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-05-06 07:23:31,279 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 257 transitions. [2021-05-06 07:23:31,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-05-06 07:23:31,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:31,280 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:31,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 07:23:31,496 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:31,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:31,496 INFO L82 PathProgramCache]: Analyzing trace with hash 2014256518, now seen corresponding path program 3 times [2021-05-06 07:23:31,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:31,497 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423987091] [2021-05-06 07:23:31,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:31,505 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:31,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1022311494] [2021-05-06 07:23:31,505 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:31,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-06 07:23:31,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:23:31,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-06 07:23:31,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:31,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:31,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:31,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:31,747 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 86 proven. 36 refuted. 0 times theorem prover too weak. 298 trivial. 0 not checked. [2021-05-06 07:23:31,748 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:31,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423987091] [2021-05-06 07:23:31,748 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:31,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022311494] [2021-05-06 07:23:31,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1022311494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:31,748 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:31,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 07:23:31,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964464095] [2021-05-06 07:23:31,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 07:23:31,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:31,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 07:23:31,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-06 07:23:31,749 INFO L87 Difference]: Start difference. First operand 212 states and 257 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-06 07:23:32,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:32,052 INFO L93 Difference]: Finished difference Result 234 states and 287 transitions. [2021-05-06 07:23:32,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 07:23:32,052 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) Word has length 106 [2021-05-06 07:23:32,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:32,054 INFO L225 Difference]: With dead ends: 234 [2021-05-06 07:23:32,054 INFO L226 Difference]: Without dead ends: 225 [2021-05-06 07:23:32,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 87.9ms TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-05-06 07:23:32,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-05-06 07:23:32,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 194. [2021-05-06 07:23:32,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 126 states have (on average 1.0952380952380953) internal successors, (138), 129 states have internal predecessors, (138), 43 states have call successors, (43), 25 states have call predecessors, (43), 24 states have return successors, (41), 39 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-06 07:23:32,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 222 transitions. [2021-05-06 07:23:32,062 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 222 transitions. Word has length 106 [2021-05-06 07:23:32,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:32,062 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 222 transitions. [2021-05-06 07:23:32,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-06 07:23:32,063 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 222 transitions. [2021-05-06 07:23:32,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 07:23:32,063 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:32,063 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:32,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:32,280 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:32,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:32,280 INFO L82 PathProgramCache]: Analyzing trace with hash 46832061, now seen corresponding path program 2 times [2021-05-06 07:23:32,280 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:32,280 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847657277] [2021-05-06 07:23:32,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:32,288 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:32,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [593998571] [2021-05-06 07:23:32,288 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:32,349 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 07:23:32,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:23:32,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-06 07:23:32,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:32,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:32,543 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 102 proven. 18 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2021-05-06 07:23:32,543 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:23:32,543 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847657277] [2021-05-06 07:23:32,543 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:23:32,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593998571] [2021-05-06 07:23:32,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593998571] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:23:32,544 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:23:32,544 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 07:23:32,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964190899] [2021-05-06 07:23:32,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 07:23:32,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:23:32,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 07:23:32,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:23:32,545 INFO L87 Difference]: Start difference. First operand 194 states and 222 transitions. Second operand has 7 states, 7 states have (on average 5.428571428571429) internal successors, (38), 7 states have internal predecessors, (38), 6 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-06 07:23:32,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:23:32,677 INFO L93 Difference]: Finished difference Result 226 states and 266 transitions. [2021-05-06 07:23:32,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 07:23:32,678 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.428571428571429) internal successors, (38), 7 states have internal predecessors, (38), 6 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 114 [2021-05-06 07:23:32,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:23:32,679 INFO L225 Difference]: With dead ends: 226 [2021-05-06 07:23:32,679 INFO L226 Difference]: Without dead ends: 193 [2021-05-06 07:23:32,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 49.4ms TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-05-06 07:23:32,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-06 07:23:32,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 179. [2021-05-06 07:23:32,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 116 states have (on average 1.103448275862069) internal successors, (128), 120 states have internal predecessors, (128), 40 states have call successors, (40), 23 states have call predecessors, (40), 22 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 07:23:32,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 205 transitions. [2021-05-06 07:23:32,684 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 205 transitions. Word has length 114 [2021-05-06 07:23:32,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:23:32,684 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 205 transitions. [2021-05-06 07:23:32,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.428571428571429) internal successors, (38), 7 states have internal predecessors, (38), 6 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-06 07:23:32,684 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 205 transitions. [2021-05-06 07:23:32,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-06 07:23:32,685 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:23:32,685 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:23:32,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:32,901 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:23:32,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:23:32,902 INFO L82 PathProgramCache]: Analyzing trace with hash -1953340215, now seen corresponding path program 4 times [2021-05-06 07:23:32,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:23:32,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060548475] [2021-05-06 07:23:32,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:23:32,910 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:23:32,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1538233571] [2021-05-06 07:23:32,910 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:23:32,977 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 07:23:32,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:23:32,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-06 07:23:32,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:23:33,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:23:33,762 WARN L159 QuantifierPusher]: Ignoring assumption.