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Type: Bug
Resolution: Fixed
Priority: High
Fix Version/s: 9.4.1, 9.2.4, 8.5.22
Affects Version/s: 8.2.1, 7.19.12, 8.6.1
Component/s: Page - Export / Import
Labels:

Support reference count:
32
Symptom Severity:
Severity 3 - Minor
UIS:
60

An unordered list created with excessive <ul><li> tags causes PDF generation to fail for the page

Sandbox crashes if sandbox process generation is enabled
OOM issue observed in the logs
CPU utilization> 100

Recreation Steps

Create a new page
Create an unordered list by pressing Tab multiple Times (storage format attached for sample page)
Create a PDF export
Issue can be reproduced irrespective of whether sandbox generation is enabled or disabled

Storage Format

<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li>Test Page</li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul>

Expected Results

PDF export successful without issues

Actual Results

PDF generation fails with below error

CPU spikes

Error in the logs

 -- url: /confluence/spaces/flyingpdf/pdfpageexport.action | userName: admin | referer: https://linux-56273.prod.atl-cd.net/confluence/display/PD/Test | traceId: 5b093dbebd82045c
2023-11-05 09:47:34,167 ERROR [http-nio-8090-exec-3 url: /confluence/spaces/flyingpdf/pdfpageexport.action; user: admin] [apache.struts2.dispatcher.DefaultDispatcherErrorHandler] sendErrorResponse Exception occurred during processing request: co
m.atlassian.confluence.importexport.ImportExportException: We couldn't complete your export. There was an error converting the page \"Test\". <a href=\"https://docs.atlassian.com/confluence/docs-86/PDF+export+in+Confluence+Data+Center\">Learn mo
re</a>
 -- url: /confluence/spaces/flyingpdf/pdfpageexport.action | userName: admin | referer: https://linux-56273.prod.atl-cd.net/confluence/display/PD/Test | traceId: 5b093dbebd82045c
java.lang.RuntimeException: com.atlassian.confluence.importexport.ImportExportException: We couldn't complete your export. There was an error converting the page "Test". <a href="https://docs.atlassian.com/confluence/docs-86/PDF+export+in+Confluence+Data+Center">Learn more</a>
        at com.atlassian.confluence.extra.flyingpdf.impl.ExportPageAsPdfAction.doExecute(ExportPageAsPdfAction.java:62)
        at com.atlassian.confluence.extra.flyingpdf.impl.PdfExportSemaphore.run(PdfExportSemaphore.java:28)
        at com.atlassian.confluence.extra.flyingpdf.impl.ExportPageAsPdfAction.execute(ExportPageAsPdfAction.java:34)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at ognl.OgnlRuntime.invokeMethodInsideSandbox(OgnlRuntime.java:1245)
        at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:1230)
        at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1958)
        at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
        at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:98)
        at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:90)
        at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:2034)
        at ognl.ASTMethod.getValueBody(ASTMethod.java:97)
        at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
        at ognl.SimpleNode.getValue(SimpleNode.java:258)
        at ognl.Ognl.getValue(Ognl.java:586)
        at com.opensymphony.xwork2.ognl.OgnlUtil.ognlGet(OgnlUtil.java:602)
        at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:578)
        at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:434)
        at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:307)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:259)
        at com.atlassian.xwork.interceptors.XWorkProfilingInterceptor.intercept(XWorkProfilingInterceptor.java:16)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:256)
        at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:179)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
        at com.atlassian.confluence.core.ConfluenceWorkflowInterceptor.intercept(ConfluenceWorkflowInterceptor.java:25)
        at com.opensymphony.xwork2.DefaultActionInvocation.executeConditional(DefaultActionInvocation.java:299)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:253)
        at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
        at com.opensymphony.xwork2.DefaultActionInvocation.executeConditional(DefaultActionInvocation.java:299)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:253)
        at com.atlassian.confluence.security.interceptors.CaptchaInterceptor.intercept(CaptchaInterceptor.java:44)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:256)
        at com.atlassian.xwork.interceptors.XWorkProfilingInterceptor.intercept(XWorkProfilingInterceptor.java:16)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:256)
        at com.atlassian.xwork.interceptors.XsrfTokenInterceptor.intercept(XsrfTokenInterceptor.java:117)
        at com.atlassian.confluence.xwork.ConfluenceXsrfTokenInterceptor.intercept(ConfluenceXsrfTokenInterceptor.java:30)
.
.
.
Caused by: com.atlassian.confluence.importexport.ImportExportException: We couldn't complete your export. There was an error converting the page "Test". <a href="https://docs.atlassian.com/confluence/docs-86/PDF+export+in+Confluence+Data+Center"
>Learn more</a>
        at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxXmlToPdfConverter.convertXhtmlToPdf(SandboxXmlToPdfConverter.java:95)
        at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxPdfExporterService.renderPdf(SandboxPdfExporterService.java:354)
        at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxPdfExporterService.createPdf(SandboxPdfExporterService.java:340)
        at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxPdfExporterService.createPdfForPage(SandboxPdfExporterService.java:230)
        at com.atlassian.confluence.extra.flyingpdf.impl.DelegatingPdfExporterService.createPdfForPage(DelegatingPdfExporterService.java:54)
        at com.atlassian.confluence.extra.flyingpdf.impl.BigBrotherPdfExporterService.createPdfForPage(BigBrotherPdfExporterService.java:122)
        at com.atlassian.confluence.extra.flyingpdf.impl.ExportPageAsPdfAction.doExecute(ExportPageAsPdfAction.java:41)
        ... 459 more
Caused by: com.atlassian.confluence.util.sandbox.SandboxCrashedException: Sandbox has crashed while serving the request
        at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.tryToThrowSpecificException(SandboxProcess.java:174)
        at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.execute(SandboxProcess.java:139)
        at com.atlassian.confluence.impl.util.sandbox.SandboxLocalProcessPool.execute(SandboxLocalProcessPool.java:107)
        at com.atlassian.confluence.impl.util.sandbox.ConfluenceSandboxPoolFactory$LazySandbox.execute(ConfluenceSandboxPoolFactory.java:70)
        at com.atlassian.confluence.impl.util.sandbox.DefaultSandbox.execute(DefaultSandbox.java:36)
        at com.atlassian.confluence.extra.flyingpdf.sandbox.PdfExportSandbox.execute(PdfExportSandbox.java:49)
        at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxXmlToPdfConverter.convertXhtmlToPdf(SandboxXmlToPdfConverter.java:83)
        ... 465 more
Caused by: java.io.EOFException
        at java.base/java.io.DataInputStream.readInt(DataInputStream.java:397)
        at com.atlassian.confluence.impl.util.sandbox.SandboxMessage.receiveMessage(SandboxMessage.java:43)
        at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.receiveMessage(SandboxProcess.java:227)
        at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.execute(SandboxProcess.java:136)
        ... 470 more

Workaround

Install Confluence Source Code Editor
- https://marketplace.atlassian.com/plugins/com.atlassian.confluence.plugins.editor.confluence-source-editor/server/overview
Edit the page, then click the Source Editor icon to edit the page source
Search for the stack of <ul><li></ui></li> tags
Once identified, remove all nested <ul><li></ui></li> tags
Save Page
Generate PDF

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Details

Description

Recreation Steps

Storage Format

Expected Results

Actual Results

PDF generation fails with below error

CPU spikes

Error in the logs

Workaround

Attachments

Attachments

Issue Links

Activity

People

Dates