New subject: [Bug 47782] Segmentation fault and exceptions using ManagementClass

19 Sep 2019


      https://bugs.winehq.org/show_bug.cgi?id=47782
Bug ID: 47782
           Summary: Segmentation fault and exceptions using
                    ManagementClass
           Product: Wine
           Version: 4.15
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs@winehq.org
          Reporter: dridi.boukelmoune@gmail.com
      Distribution: ---
Originally reported on Fedora's bugzilla for Wine 4.12 (Fedora includes
wine-staging) and still happening with Wine 4.15, I'm now throwing the towel as
I failed to debug this by myself. I'm interested in commit hashes if a fix is
merged, and general pointers on how to deal with this in the future. For
example I couldn't get a full back trace when building the master branch and
never managed to print arguments up the stack with WineDbg.
https://bugzilla.redhat.com/show_bug.cgi?id=1734794
I can reliably reproduce the C# exceptions and the segfault on my system
(either using Fedora packages or building the master branch with or without
wine-staging):
$ cat test.cs
using System;
using System.Management;
class Test {
        static void Main(string[] args) {
                ManagementClass mc = new ManagementClass(args[0]);
                ManagementObjectCollection moc = mc.GetInstances();
                foreach (ManagementObject mo in moc) {
                        Console.Write("{0}\n", mo);
                        foreach (PropertyData pd in mo.Properties)
                                Console.Write("\t{0} => {1}\n", pd.Name,
pd.Value);
                }
                moc.Dispose();
                mc.Dispose();
        }
}
$ mcs /reference:System.Management.dll test.cs
$ ./test.exe Win32_OperatingSystem # OK
$ ./test.exe Win32_PhysicalMemory # OK
$ ./test.exe Win32_SoundDevice # OK
$ ./test.exe Win32_Processor # System.InvalidCastException
$ ./test.exe Win32_VideoController # System.InvalidCastException
$ ./test.exe Win32_DesktopMonitor # System.InvalidCastException
$ ./test.exe Win32_DisplayControllerConfiguration # SIGSEGV
The problem on the current master branch is the same as when I first reported
the segfault to Fedora, except that things moved around a bit:
0x0000000067753b3e build_relpath+0x37 [dlls\wbemprox\query.c:866] in wbemprox:
movq    (%rax),%rax
866        struct table *table = view->table[table_index];
Again, view->table is null when test.exe is run with
Win32_DisplayControllerConfiguration, and for other paths the results are the
same (no regression nor improvement).
Obviously my testing is not comprehensive, there may be other problematic
management paths but those are the ones I came across. I will happily test
patches if requested.
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[Bug 47782] New: Segmentation fault and exceptions using ManagementClass