[Bug 37962] New: WebMon occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

Bug ID: 37962
           Summary: WebMon occasionally crashes when checking web pages
                    for updates
           Product: Wine
           Version: 1.7.33
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 50576
  --> https://bugs.winehq.org/attachment.cgi?id=50576
Crash backtrace

Wine occasionally crashes when WebMon (http://www.cmcode.co.uk/webmon/) is
checking web pages for updates. The crash happens with Wine 1.7.33 and the
stable version 1.6.2.

You can download the WebMon executable from
http://dump.bitcheese.net/files/ylysado/WebMon.exe

$ sha1sum WebMon.exe 
280e00a1fe77ca88c9dfe2080caf9689aad2ffe1  WebMon.exe

I have attached the backtrace. If you need more information, please let me
know.

[Bug 37962] WebMon occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

Sebastian Lackner  changed:

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

--- Comment #1 from Sebastian Lackner  ---
Could you please attach the full terminal output? Take a look here for more
information:
http://wiki.winehq.org/FAQ#get_log

[Bug 37962] WebMon occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

--- Comment #2 from [e-mail] ---
Created attachment 50581
  --> https://bugs.winehq.org/attachment.cgi?id=50581
Full terminal output

Here's the output produced by
$ wine /usr/local/bin/WebMon.exe &> log.txt

I don't see any names of C source files in it. Can you tell me how to install
the debugging symbols on Gentoo?

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

Anastasius Focht  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |download
                URL|                            |http://dump.bitcheese.net/f
                   |                            |iles/ylysado/WebMon.exe
                 CC|                            |[e-mail]
            Summary|WebMon occasionally crashes |WebMon 1.0 occasionally
                   |when checking web pages for |crashes when checking web
                   |updates                     |pages for updates

--- Comment #3 from Anastasius Focht  ---
Hello folks,

if you're on Gentoo (as your handle implies) 'FEATURES=splitdebug' and rebuild
of Wine might do it.

Anyway, even without any symbol info my guess would be the async DNS resolver
being the culprit here.
Something is broken with your host network config.

The app works fine for me using 'http://news.google.com' (which changes almost
every second).

--- snip ---
Z:\usr\local\bin\WebMon.exe
--- snip ---

Putting/mixing Win32 PE binaries in path shared with native Linux binaries is
kinda strange. Even if this works (app doesn't need write permissions in same
folder) it's not really advised. That's what a separate WINEPREFIX is for.

$ du -sh WebMon.exe 
360K    WebMon.exe

$ sha1sum WebMon.exe 
280e00a1fe77ca88c9dfe2080caf9689aad2ffe1  WebMon.exe

$ wine --version
wine-1.7.34-159-g7b45103

Regards

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

[e-mail] changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #50581|0                           |1
        is obsolete|                            |

--- Comment #4 from [e-mail] ---
Created attachment 50584
  --> https://bugs.winehq.org/attachment.cgi?id=50584
Full terminal output with debug info

(In reply to Anastasius Focht from comment #3)
> if you're on Gentoo (as your handle implies) 'FEATURES=splitdebug' and
> rebuild of Wine might do it.

Thanks, re-emerging Wine with FEATURES=splitdebug didn't change anything but
FEATURES=nostrip did the trick. I have attached the log with the debug info.
> Anyway, even without any symbol info my guess would be the async DNS
> resolver being the culprit here.

Looks, like your guess was right.
> Something is broken with your host network config.

There is nothing special with my network config. I also observed the crash on
another machine attached to a completely different network.
Even if my network connection was faulty, I don't think Wine should crash or is
WebMon poorly programmed?
> The app works fine for me using 'http://news.google.com' (which changes
> almost every second).

In most cases WebMon works fine for my too. The crash happens rarely and is
hard to reproduce. I have about one hundred websites I am monitoring and I had
to start the check up to ten times for the crash to happen.
> Putting/mixing Win32 PE binaries in path shared with native Linux binaries
> is kinda strange. Even if this works (app doesn't need write permissions in
> same folder) it's not really advised. That's what a separate WINEPREFIX is
> for.

You're right. But it shouldn't interfere with Linux because I haven't set the
executable bit. I simply put the program in /usr/local/bin because the path is
covered by my backup script. But I will think of placing it somewhere else.

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

--- Comment #5 from [e-mail] ---
Created attachment 50585
  --> https://bugs.winehq.org/attachment.cgi?id=50585
Additional debug info

I also compiled wine-1.7.33 from source and tried to reproduce the crash. This
log also contains the names of the source files with the corresponding line
numbers.

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

--- Comment #6 from Bruno Jesus  ---
A +winsock lock would be useful then, please read
http://wiki.winehq.org/FAQ#get_log (10.1 and 10.2).

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

--- Comment #7 from Bruno Jesus  ---
(In reply to Bruno Jesus from comment #6)
> A +winsock lock would be useful then, please read
> http://wiki.winehq.org/FAQ#get_log (10.1 and 10.2).

I mean log, not lock =)

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

--- Comment #8 from [e-mail] ---
Created attachment 50590
  --> https://bugs.winehq.org/attachment.cgi?id=50590
debug log with +winsock

Here's the (shortened) log created with

$ WINEDEBUG=+winsock ./wine /usr/local/bin/WebMon.exe >> /tmp/output.txt 2>&1

using wine-1.7.33 compiled from source. The log only contains the last three
queries. I think this is sufficient, if not please drop me a line.

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

--- Comment #9 from Sebastian Lackner  ---
--- snip ---
trace:winsock:DllMain 0x7da30000 0x0 (nil)
wine: Unhandled page fault on read access to 0x7da338c5 at address 0x7da338c5
(thread 0025), starting debugger...
trace:winsock:DllMain 0x7da30000 0x1 (nil)
trace:winsock:WSAStartup verReq=101
--- snip ---

ws2_32 is unloaded while there is still an async callback pending. I assume we
have to hold a reference to the library while callbacks are still active (if it
doesn't crash on Windows).

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

--- Comment #10 from Nikolay Sivov  ---
(In reply to Sebastian Lackner from comment #9)
> ws2_32 is unloaded while there is still an async callback pending. I assume
> we have to hold a reference to the library while callbacks are still active
> (if it doesn't crash on Windows).

Easy way to check is to block unloading for it. Is there a clean way to check
if it's possible to actually load/unload/load again on Windows?

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates

https://bugs.winehq.org/show_bug.cgi?id=37962

--- Comment #11 from [e-mail] ---
(In reply to Sebastian Lackner from comment #9)
> ws2_32 is unloaded while there is still an async callback pending. I assume
> we have to hold a reference to the library while callbacks are still active
> (if it doesn't crash on Windows).

I used WebMon a couple of years ago on Windows and didn't see any crash. Today
I tested it thoroughly again and I can confirm that it works fine on Windows.

If I should check something else on Windows or test a patch for Wine, please
let me know.

[Bug 37962] WebMon 1.0 occasionally crashes when checking web pages for updates (ws2_32.dll unloaded while async DNS resolver callbacks still pending)

https://bugs.winehq.org/show_bug.cgi?id=37962

Anastasius Focht  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
          Component|-unknown                    |winsock
            Summary|WebMon 1.0 occasionally     |WebMon 1.0 occasionally
                   |crashes when checking web   |crashes when checking web
                   |pages for updates           |pages for updates
                   |                            |(ws2_32.dll unloaded while
                   |                            |async DNS resolver
                   |                            |callbacks still pending)
     Ever confirmed|0                           |1

--- Comment #12 from Anastasius Focht  ---
Hello folks,

refining summary and confirming on behalf of OP.
Likely still present.

$ wine --version
wine-1.7.48-74-gb3fe96a

Regards