$ ./gdb --pid 1048
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Attaching to process 1048
[New Thread 1048.0x31c]
[New Thread 1048.0x85c]
Reading symbols from C:\cygwin\home\udalrich\emacs\emacs-23.1\bin\emacs.exe...do
[Switching to Thread 1048.0x85c]
(gdb) info thread
* 2 Thread 1048.0x85c 0x7c90120f in ntdll!DbgUiConnectToDbg ()
1 Thread 1048.0x31c 0x7c90e514 in ntdll!LdrAccessResource ()
(gdb) thread 1
[Switching to thread 1 (Thread 1048.0x31c)]#0 0x7c90e514 in ntdll!LdrAccessReso
urce () from C:\WINDOWS\system32\ntdll.dll
#0 0x7c90e514 in ntdll!LdrAccessResource ()
#1 0x7c90df5a in ntdll!ZwWaitForSingleObject ()
#2 0x7c8025db in WaitForSingleObjectEx ()
#3 0x00000749 in ?? ()
#4 0x00000000 in ?? ()
I don't think that's much more useful.
If I run it from gdb, it hangs. C-c will give me a gdb prompt. From there, where gives me the same stack trace as above. I suspect the ?? in the stack trace are due to emacs not being compiled with debug info. (I assume that's how the standard distribution is built.)