[Bug 59803] New: Program crash on debugger interrupt in wow64 mode

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59803

            Bug ID: 59803
           Summary: Program crash on debugger interrupt in wow64 mode
           Product: Wine
           Version: 11.9
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winedbg
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 81045
  --> http://bugs.winehq.org/attachment.cgi?id=81045
backtrace

Distro: CachyOS

When debugging a 32-bit program in wow64 mode, trying to interrupt its
execution with Ctrl+C causes it to crash.

As an example, let's take wine's `notepad.exe` as it has both 64 and 32 bit
versions.

Steps to reproduce:
1. change directory to <wine_prefix>/drive_c/windows
2. launch 32bit version: `winedbg syswow64/notepad.exe`
3. continue program execution (with `c`)
4. interrupt the program (with `Ctrl+C`)
5. the program crashes. The window still exists, but is not responsive.
6. Exit debugger (with `quit`)

Repeating the same steps but with 64 bit version does not result in a crash
2. launch 64bit version: `winedbg system32/notepad.exe`

Interestingly, when launching e.g. `syswow64/regedit.exe`, the UI doesn't
become unresponsive after the crash and continues to work. Maybe its related to
multithreading?

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[Bug 59803] Program crash on debugger interrupt in wow64 mode

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59803

Eric Pouech <[e-mail]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|winedbg                     |ntdll
     Ever confirmed|0                           |1
                 CC|                            |[e-mail],
                   |                            |[e-mail]
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Eric Pouech <[e-mail]> ---
confirming

issue lies in fact in ntdll's NtCreateThreadEx implementation (hence change in
component for this ticket)

DbgUiIssueRemoteBreakin calls NtCreateThreadEx with a 64bit thread start
address, which gets incorrectly cropped to 32bit when starting the thread.
AFAICT this call is supported by native.

cc:ing Alexandre to check if either he wants to take care of it (otherwise, we
could pass the 32bit version of the start address, but that would be uglier)

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[Bug 59803] Program crash on debugger interrupt in wow64 mode

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59803

Eric Pouech <[e-mail]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

--- Comment #2 from Eric Pouech <[e-mail]> ---
*** Bug 59827 has been marked as a duplicate of this bug. ***

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