[Bug 15206] New: Trouble with symbolic stack dumps and Chromium

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=15206

           Summary: Trouble with symbolic stack dumps and Chromium
           Product: Wine
           Version: CVS/GIT
          Platform: Other
               URL:  http://build.chromium.org/buildbot/snapshots/chromium-
                    rel-xp/
        OS/Version: other
            Status: NEW
          Keywords: download, source
          Severity: normal
          Priority: P2
         Component: dbghelp
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: dank at kegel.com


Chromium has nightly builds with pdb files at
http://build.chromium.org/buildbot/snapshots/chromium-rel-xp/
and if you install corefonts, then current wine can install
and run (though for me chromium hangs when loading web page).

However, getting symbolic stack dumps (sometimes?) fails.
To get wine to find the symbol files, put them in the current 
directory (or the directory they were in when they were built,
or a directory on Wine's PATH).
But wine complains

trace:dbghelp_msc:pdb_init
PDB(Z:\home\dank\snapshots\1712\chrome-win32-syms\chrome_dll.pdb): "Microsoft
C/C++ MSF 7.00\r\n\x1aDS\x00\
trace:dbghelp_msc:pdb_init found DS/f for
Z:\home\dank\snapshots\1712\chrome-win32-syms\chrome_dll.pdb: age=30
guid={c007e080-dbde-4fd9-a8dd-ae84cd0524a9}
warn:dbghelp:module_find_cb Found
L"Z:\\home\\dank\\snapshots\\1712\\chrome-win32-syms\\chrome_dll.pdb", but
wrong age: 00000030 0000002c

(Does that mean the .pdb files are mismatched, or is this a wine bug?)

This patch disables the "age" check and seems to let symbolic
stacks to be produced:

--- a/dlls/dbghelp/path.c
+++ b/dlls/dbghelp/path.c
@@ -560,7 +560,7 @@ static BOOL CALLBACK module_find_cb(PCWSTR buffer, PVOID
use
             }
             if (pdb_lookup.age != mf->dw2)
             {
-                matched--;
+                //matched--;
                 WARN("Found %s, but wrong age: %08x %08x\n",
                      debugstr_w(buffer), pdb_lookup.age, mf->dw2);
             }

although now I don't seem to need the patch, so maybe I'm smoking crack.

Also, after about 12 lines of backtrace, winedbg seems to get
stuck in an infinite loop.  And before the backtrace there are
hundreds of thousands of lines like
fixme:dbghelp_msc:codeview_snarf Unsupported symbol id 1012

FWIW, here's my script to reproduce:

#!/bin/sh
set -xe
# This snapshot crashed for me; normally you'll want the latest one
SNAPSHOT=1712

export WINE=$HOME/wine-git/wine
export WINEPREFIX=$HOME/.wine
cd $HOME
mkdir -p pdb-bug
cd pdb-bug

# Grab and unpack a snapshot of Chromium including debugging symbols
wget -c
http://build.chromium.org/buildbot/snapshots/chromium-rel-xp/$SNAPSHOT/chrome-win32.zip
test -d chrome-win32 || unzip chrome-win32.zip
wget -c
http://build.chromium.org/buildbot/snapshots/chromium-rel-xp/$SNAPSHOT/chrome-win32-syms.zip
test -f chrome_exe.pdb || unzip -j chrome-win32-syms.zip

# Clean up .wine and install corefonts
rm -rf $WINEPREFIX
rm -f winetricks
wget http://kegel.com/wine/winetricks
sh winetricks -q corefonts

$WINE chrome-win32/chrome.exe --no-sandbox --single-process --disable-breakpad
http://www.kegel.com 2>&1 | tee wine.log
echo 'Now look at $PWD/wine.log to see whether a symbolic backtrace was
produced.'
echo 'Without the patch, it (sometimes?) fails with WARN "Found %s, but wrong
age".'


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