./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version d790fecc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/config/KojakReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/config/svcomp-Reach-32bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 8cf9a91c8f1111f4616406dfb4a7fdeef392d21e591ff8d6357140f3015668db --- Real Ultimate output --- This is Ultimate 0.3.0-dev-d790fec [2024-12-06 01:34:41,492 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-12-06 01:34:41,550 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/config/svcomp-Reach-32bit-Kojak_Default.epf [2024-12-06 01:34:41,554 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-12-06 01:34:41,554 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck.Interpolating solver [2024-12-06 01:34:41,574 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-12-06 01:34:41,575 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-12-06 01:34:41,575 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2024-12-06 01:34:41,575 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-12-06 01:34:41,575 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-12-06 01:34:41,575 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-12-06 01:34:41,575 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-12-06 01:34:41,575 INFO L153 SettingsManager]: * sizeof long=4 [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * sizeof long double=12 [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * Behaviour of calls to undefined functions=OVERAPPROXIMATE_BEHAVIOUR [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * Use constant arrays=true [2024-12-06 01:34:41,576 INFO L151 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2024-12-06 01:34:41,576 INFO L153 SettingsManager]: * Timeout in seconds=1000000 [2024-12-06 01:34:41,577 INFO L153 SettingsManager]: * Theory for external solver=ALL [2024-12-06 01:34:41,577 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-12-06 01:34:41,577 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-12-06 01:34:41,577 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-12-06 01:34:41,577 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-12-06 01:34:41,577 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-12-06 01:34:41,577 INFO L153 SettingsManager]: * Trace refinement strategy=PENGUIN [2024-12-06 01:34:41,577 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-12-06 01:34:41,577 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8cf9a91c8f1111f4616406dfb4a7fdeef392d21e591ff8d6357140f3015668db [2024-12-06 01:34:41,835 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-12-06 01:34:41,843 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-12-06 01:34:41,846 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-12-06 01:34:41,847 INFO L270 PluginConnector]: Initializing CDTParser... [2024-12-06 01:34:41,847 INFO L274 PluginConnector]: CDTParser initialized [2024-12-06 01:34:41,848 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c [2024-12-06 01:34:44,512 INFO L533 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/data/0d12e2cd1/d0c8b60c5f724869a9ab4326a301a2f4/FLAG68b9979f0 [2024-12-06 01:34:44,716 INFO L384 CDTParser]: Found 1 translation units. [2024-12-06 01:34:44,716 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c [2024-12-06 01:34:44,724 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/data/0d12e2cd1/d0c8b60c5f724869a9ab4326a301a2f4/FLAG68b9979f0 [2024-12-06 01:34:44,737 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/data/0d12e2cd1/d0c8b60c5f724869a9ab4326a301a2f4 [2024-12-06 01:34:44,739 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-12-06 01:34:44,740 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-12-06 01:34:44,741 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-12-06 01:34:44,741 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-12-06 01:34:44,744 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-12-06 01:34:44,745 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.12 01:34:44" (1/1) ... [2024-12-06 01:34:44,746 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49ba0af9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:44, skipping insertion in model container [2024-12-06 01:34:44,746 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.12 01:34:44" (1/1) ... [2024-12-06 01:34:44,765 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-12-06 01:34:44,958 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c[8379,8392] [2024-12-06 01:34:44,961 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-12-06 01:34:44,972 INFO L200 MainTranslator]: Completed pre-run [2024-12-06 01:34:45,015 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c[8379,8392] [2024-12-06 01:34:45,015 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-12-06 01:34:45,031 INFO L204 MainTranslator]: Completed translation [2024-12-06 01:34:45,031 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45 WrapperNode [2024-12-06 01:34:45,031 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-12-06 01:34:45,033 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-12-06 01:34:45,033 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-12-06 01:34:45,033 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-12-06 01:34:45,039 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,045 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,066 INFO L138 Inliner]: procedures = 24, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 275 [2024-12-06 01:34:45,066 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-12-06 01:34:45,067 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-12-06 01:34:45,067 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-12-06 01:34:45,067 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-12-06 01:34:45,075 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,075 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,078 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,078 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,084 INFO L184 PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,085 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,090 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,092 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,094 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,096 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-12-06 01:34:45,097 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-12-06 01:34:45,097 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-12-06 01:34:45,097 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-12-06 01:34:45,098 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2024-12-06 01:34:45,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/z3 [2024-12-06 01:34:45,133 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) [2024-12-06 01:34:45,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_943ea9cf-6a7d-4159-9037-b6931a0752f7/bin/ukojak-verify-CZk0znPC7b/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Waiting until timeout for monitored process [2024-12-06 01:34:45,161 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-12-06 01:34:45,162 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-12-06 01:34:45,162 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-12-06 01:34:45,162 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-12-06 01:34:45,233 INFO L234 CfgBuilder]: Building ICFG [2024-12-06 01:34:45,235 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2024-12-06 01:34:45,561 INFO L? ?]: Removed 35 outVars from TransFormulas that were not future-live. [2024-12-06 01:34:45,562 INFO L283 CfgBuilder]: Performing block encoding [2024-12-06 01:34:45,881 INFO L307 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-12-06 01:34:45,882 INFO L312 CfgBuilder]: Removed 2 assume(true) statements. [2024-12-06 01:34:45,882 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.12 01:34:45 BoogieIcfgContainer [2024-12-06 01:34:45,882 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-12-06 01:34:45,882 INFO L112 PluginConnector]: ------------------------CodeCheck---------------------------- [2024-12-06 01:34:45,883 INFO L270 PluginConnector]: Initializing CodeCheck... [2024-12-06 01:34:45,890 INFO L274 PluginConnector]: CodeCheck initialized [2024-12-06 01:34:45,890 INFO L184 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.12 01:34:45" (1/1) ... [2024-12-06 01:34:45,896 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-12-06 01:34:45,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:34:45,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 12 states and 16 transitions. [2024-12-06 01:34:45,933 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2024-12-06 01:34:45,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2024-12-06 01:34:45,935 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:34:45,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:34:46,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:34:47,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:34:47,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:34:47,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 13 states and 18 transitions. [2024-12-06 01:34:47,117 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 18 transitions. [2024-12-06 01:34:47,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2024-12-06 01:34:47,117 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:34:47,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:34:47,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:34:47,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:34:47,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:34:47,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 16 states and 24 transitions. [2024-12-06 01:34:47,798 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 24 transitions. [2024-12-06 01:34:47,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2024-12-06 01:34:47,799 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:34:47,799 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:34:47,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:34:48,419 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:34:48,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:34:48,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 20 states and 31 transitions. [2024-12-06 01:34:48,887 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 31 transitions. [2024-12-06 01:34:48,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-12-06 01:34:48,889 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:34:48,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:34:48,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:34:49,094 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:34:49,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:34:49,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 23 states and 36 transitions. [2024-12-06 01:34:49,358 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 36 transitions. [2024-12-06 01:34:49,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2024-12-06 01:34:49,358 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:34:49,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:34:49,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:34:52,590 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:34:55,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:34:55,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 33 states and 55 transitions. [2024-12-06 01:34:55,611 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 55 transitions. [2024-12-06 01:34:55,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2024-12-06 01:34:55,612 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:34:55,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:34:55,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:34:56,068 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:34:58,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:34:58,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 41 states and 71 transitions. [2024-12-06 01:34:58,124 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 71 transitions. [2024-12-06 01:34:58,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2024-12-06 01:34:58,124 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:34:58,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:34:58,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:00,569 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:35:05,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:35:05,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 52 states and 93 transitions. [2024-12-06 01:35:05,185 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 93 transitions. [2024-12-06 01:35:05,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2024-12-06 01:35:05,185 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:35:05,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:35:05,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:05,462 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:35:05,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:35:05,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 53 states and 95 transitions. [2024-12-06 01:35:05,724 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 95 transitions. [2024-12-06 01:35:05,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2024-12-06 01:35:05,724 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:35:05,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:35:05,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:07,038 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:35:12,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:35:12,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 64 states and 126 transitions. [2024-12-06 01:35:12,286 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 126 transitions. [2024-12-06 01:35:12,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-12-06 01:35:12,287 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:35:12,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:35:12,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:13,519 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:35:16,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:35:16,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 71 states and 143 transitions. [2024-12-06 01:35:16,304 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 143 transitions. [2024-12-06 01:35:16,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-12-06 01:35:16,305 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:35:16,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:35:16,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:17,453 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:35:22,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:35:22,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 83 states and 171 transitions. [2024-12-06 01:35:22,587 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 171 transitions. [2024-12-06 01:35:22,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-12-06 01:35:22,588 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:35:22,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:35:22,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:23,039 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:35:25,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:35:25,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 89 states and 181 transitions. [2024-12-06 01:35:25,215 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 181 transitions. [2024-12-06 01:35:25,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-12-06 01:35:25,216 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:35:25,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:35:25,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:25,866 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:35:26,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:35:26,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 90 states and 187 transitions. [2024-12-06 01:35:26,362 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 187 transitions. [2024-12-06 01:35:26,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-12-06 01:35:26,363 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:35:26,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:35:26,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:27,512 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:35:29,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:35:29,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 92 states and 193 transitions. [2024-12-06 01:35:29,102 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 193 transitions. [2024-12-06 01:35:29,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-12-06 01:35:29,103 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:35:29,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:35:29,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:29,470 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:35:30,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:35:30,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 93 states and 194 transitions. [2024-12-06 01:35:30,009 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 194 transitions. [2024-12-06 01:35:30,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2024-12-06 01:35:30,009 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:35:30,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:35:30,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:35:51,434 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:36:34,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:36:34,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 118 states and 271 transitions. [2024-12-06 01:36:34,547 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 271 transitions. [2024-12-06 01:36:34,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2024-12-06 01:36:34,548 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:36:34,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:36:34,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:36:58,673 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:38:16,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:38:16,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 143 states and 344 transitions. [2024-12-06 01:38:16,990 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 344 transitions. [2024-12-06 01:38:16,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2024-12-06 01:38:16,990 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:38:16,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:38:17,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:38:58,469 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:40:55,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:40:55,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 168 states and 424 transitions. [2024-12-06 01:40:55,435 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 424 transitions. [2024-12-06 01:40:55,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-12-06 01:40:55,435 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:40:55,435 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:40:55,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:42:23,872 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:43:03,098 WARN L286 SmtUtils]: Spent 6.14s on a formula simplification. DAG size of input: 524 DAG size of output: 482 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:43:15,494 WARN L286 SmtUtils]: Spent 5.33s on a formula simplification. DAG size of input: 529 DAG size of output: 389 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:44:38,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:44:38,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 192 states and 489 transitions. [2024-12-06 01:44:38,400 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 489 transitions. [2024-12-06 01:44:38,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-12-06 01:44:38,401 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:44:38,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:44:38,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:45:54,454 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-12-06 01:46:48,595 WARN L286 SmtUtils]: Spent 6.08s on a formula simplification. DAG size of input: 574 DAG size of output: 426 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:46:57,865 WARN L286 SmtUtils]: Spent 6.05s on a formula simplification. DAG size of input: 576 DAG size of output: 452 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:47:14,737 WARN L286 SmtUtils]: Spent 6.05s on a formula simplification. DAG size of input: 579 DAG size of output: 434 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:47:22,654 WARN L286 SmtUtils]: Spent 6.90s on a formula simplification. DAG size of input: 581 DAG size of output: 458 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:47:46,930 WARN L286 SmtUtils]: Spent 7.43s on a formula simplification. DAG size of input: 579 DAG size of output: 446 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:47:53,697 WARN L286 SmtUtils]: Spent 5.69s on a formula simplification. DAG size of input: 581 DAG size of output: 453 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:48:11,817 WARN L286 SmtUtils]: Spent 6.89s on a formula simplification. DAG size of input: 581 DAG size of output: 448 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:48:18,844 WARN L286 SmtUtils]: Spent 5.86s on a formula simplification. DAG size of input: 583 DAG size of output: 455 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:48:37,194 WARN L286 SmtUtils]: Spent 5.20s on a formula simplification. DAG size of input: 469 DAG size of output: 374 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:48:43,430 WARN L286 SmtUtils]: Spent 5.34s on a formula simplification. DAG size of input: 471 DAG size of output: 400 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-12-06 01:49:20,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2024-12-06 01:49:20,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 565 states to 217 states and 565 transitions. [2024-12-06 01:49:20,884 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 565 transitions. [2024-12-06 01:49:20,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-12-06 01:49:20,884 INFO L420 CodeCheckObserver]: Error Path is FOUND. [2024-12-06 01:49:20,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-12-06 01:49:21,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-12-06 01:49:23,479 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 9 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.