Re: LoadLibrary race/deadlock

From: Jonathan Morrison [MSFT] (jonathanm_at_mindspring.com)
Date: 11/25/04 

Date: Wed, 24 Nov 2004 17:28:27 -0800

Can you include the callstack for that thread by using the 'k' command? 

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"Henry Markov" <jnhblhr@yahoo.com> wrote in message 
news:41A4EE59.70E80BD3@yahoo.com...
> Pavel and Jonathan,
> Thanks for the responses.  I've done software development for 30+ years 
> but very
> little in the Windows domain therefore most of your information was new to 
> me.
> Here is the log from my debug session:
>
> Opened log file 'c:\enclog'
> 0:000> !locks
>
> CritSec ntdll!LdrpLoaderLock+0 at 7C97C0D8
> LockCount          2
> RecursionCount     2
> OwningThread       fd4
> EntryCount         1
> ContentionCount    1
> *** Locked
>
> Scanned 145 critical sections
> 0:000> ~~[fd4]s
> eax=00000075 ebx=000000e8 ecx=00000010 edx=0007e3e2 esi=003f22c0 
> edi=000000e8
> eip=7c90eb94 esp=0012f51c ebp=0012f54c iopl=0         nv up ei pl zr na po 
> nc
> cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000 
> efl=00000246
> ntdll!KiFastSystemCallRet:
> 7c90eb94 c3               ret
> Closing open log file c:\enclog
>
> I suppose this verifies a deadlock but the information about thread ID fd4
> appears to be mostly register and condition code values that don't tell me
> much.  Is there something in this information that is clearly important?
>
> Note that I have been told that the DLL that I am invoking does not have a
> DllMain.  Does anything in the output suggest that libmmd.dll is 
> implicated in
> the deadlock?  To repeat, an earlier version of the DLL compiled with VC6 
> never
> exhibited this race/deadlock.  It started immediately after switching to 
> the
> Intel compiler which we want to use because of its Pentium-M 
> optimizations.  The
> Intel compiler, but not VC6, creates a dependency on libmmd.dll.
>
> HM
>
> Pavel Lebedinsky wrote:
>>
>> When the program hangs, attach to it with windbg/cdb and run
>> these commands:
>>
>> 0:000> .symfix c:\symbols
>> 0:000> .reload
>> 0:000> !locks
>>
>> Most likely your problem is caused by somebody holding the loader
>> lock, so you should see something like this in the output:
>>
>> CritSec ntdll!LdrpLoaderLock+0 at 7C97C0D8
>> LockCount          0
>> RecursionCount     1
>> OwningThread       a08
>> EntryCount         0
>> ContentionCount    0
>> *** Locked
>>
>> You can then switch to the thread that holds the lock (in this
>> case it's thread id 0xa08) and check what it is doing:
>>
>> 0:000> ~~[a08]s
>> 0:000> k

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