Unmanaged crash in CefSharp

[demirkaric]

Is there an existing issue for this?

• I have searched both open/closed issues, no issue already exists.

CefSharp Version

133.4.21

Operating System

Windows 10

Architecture

x86

.Net Version

Net 4.8.1

Implementation

WinForms

Reproduction Steps

Description

I have a C# WinForms email client that uses CefSharp as a browser to render emails from a Roundcube Webmail interface.

The application crashes when a user opens a specific email containing a PDF attachment or embedded PDF. The error logged is:
Render process terminated. Status: ProcessCrashed, ErrorCode: -1073741571 ErrorMessage: STATUS_STACK_OVERFLOW

Other emails open fine, including those with different types of attachments. This issue occurs only with emails from one specific sender that include a PDF file.

Observed Debugging Behavior

• Attached a debugger to CefSharp.BrowserSubprocess.exe.

• The crash occurs inside SubProcess.h in the Run() method at this line:

  return CefExecuteProcess(cefMainArgs, (CefApp*)_cefApp.get(), nullptr);
  

The issue only affects certain emails with PDF attachments.
Other emails, including those with different attachments, open without issues.

I have attached cefsharp log in actual behavior.

Expected behavior

The email should load normally, without crashing the application.

Actual behavior

The application crashes with a stack overflow when opening a specific email containing a PDF.

[2084:23268:0314/110129.460:VERBOSE1:script_context.cc(149)] Created context:
extension id: (none)
frame: 0x9d36b00
URL:
context_type: WEB_PAGE
effective extension id: (none)
effective context type: WEB_PAGE
[2084:23268:0314/110129.460:VERBOSE1:script_context.cc(149)] Created context:
extension id: (none)
frame: (nil)
URL:
context_type: UNSPECIFIED
effective extension id: (none)
effective context type: UNSPECIFIED
[2084:23268:0314/110129.460:VERBOSE1:dispatcher.cc(541)] Num tracked contexts: 3
[37676:32188:0314/110129.461:VERBOSE1:browser_info_manager.cc(587)] frame 5-0408F23F68B22D0F088A56A158BB8807, pdf_process=0, browser_process_guest=0, print_preview_dialog=0, main=0
[2084:23268:0314/110129.461:VERBOSE1:script_context.cc(149)] Created context:
extension id: (none)
frame: 0x9d36b00
URL:
context_type: UNSPECIFIED
effective extension id: (none)
effective context type: UNSPECIFIED
[2084:23268:0314/110129.461:VERBOSE1:script_context.cc(149)] Created context:
extension id: (none)
frame: (nil)
URL:
context_type: UNSPECIFIED
effective extension id: (none)
effective context type: UNSPECIFIED
[2084:23268:0314/110129.461:VERBOSE1:dispatcher.cc(541)] Num tracked contexts: 4
[2084:23268:0314/110129.465:VERBOSE1:script_context.cc(149)] Created context:
extension id: (none)
frame: 0x9d36b00
URL:
context_type: UNSPECIFIED
effective extension id: (none)
effective context type: UNSPECIFIED
[2084:23268:0314/110129.465:VERBOSE1:script_context.cc(149)] Created context:
extension id: (none)
frame: (nil)
URL:
context_type: UNSPECIFIED
effective extension id: (none)
effective context type: UNSPECIFIED
[2084:23268:0314/110129.465:VERBOSE1:dispatcher.cc(541)] Num tracked contexts: 5
[20400:37172:0314/110129.470:VERBOSE1:network_delegate.cc(37)] NetworkDelegate::NotifyBeforeURLRequest: https://webmail.domain.com/?_task=addressbook&_action=photo&_email=email@domain.com&_error=1&_bgcolor=transparent
[20400:37172:0314/110129.471:VERBOSE1:network_delegate.cc(37)] NetworkDelegate::NotifyBeforeURLRequest: https://webmail.domain.com/?_task=mail&_action=get&_mbox=INBOX.Sent&_uid=114763&_token=P8gdOtevIUp0bzWUmrL2VleFG6VjYD5Z&_part=1.2.2&_embed=1&_mimeclass=image
[20400:37172:0314/110129.472:VERBOSE1:url_loader.cc(2111)] Will sniff content for mime type: https://webmail.domain.com/?_task=addressbook&_action=photo&_email=email@domain.com&_error=1&_bgcolor=transparent
[2084:23268:0314/110129.475:VERBOSE1:script_context.cc(162)] Destroyed context for extension
extension id:
effective extension id:
[2084:23268:0314/110129.475:VERBOSE1:script_context.cc(162)] Destroyed context for extension
extension id:
effective extension id:
[2084:23268:0314/110129.475:VERBOSE1:script_context.cc(162)] Destroyed context for extension
extension id:
effective extension id:
[2084:23268:0314/110129.475:VERBOSE1:script_context.cc(162)] Destroyed context for extension
extension id:
effective extension id:
[37676:32188:0314/110129.475:VERBOSE1:browser_info_manager.cc(587)] frame 5-0408F23F68B22D0F088A56A158BB8807, pdf_process=0, browser_process_guest=0, print_preview_dialog=0, main=0
[37676:32188:0314/110129.476:VERBOSE1:browser_info_manager.cc(587)] frame 5-0408F23F68B22D0F088A56A158BB8807, pdf_process=0, browser_process_guest=0, print_preview_dialog=0, main=0
[37676:32188:0314/110129.476:VERBOSE1:browser_info_manager.cc(587)] frame 5-0408F23F68B22D0F088A56A158BB8807, pdf_process=0, browser_process_guest=0, print_preview_dialog=0, main=0

Regression?

No response

Known Workarounds

No response

Does this problem also occur in the CEF Sample Application

Not Tested

Other information

No response

[amaitland]

Does this problem also occur in the CEF Sample Application

Not Tested

Please test with the sample application linked in the issue template.