[Switching to thread 1568.0x6a4]
(gdb) bt
#0  0x78477705 in ntdll!DbgUiConnectToDbg ()
   from /cygdrive/c/WINNT/System32/NTDLL.DLL
#1  0x77e91982 in KERNEL32!GetThreadContext ()
   from /cygdrive/c/WINNT/system32/KERNEL32.DLL
#2  0x78462b95 in vsnprintf () from /cygdrive/c/WINNT/System32/NTDLL.DLL
#3  0x77e787dd in KERNEL32!GetModuleFileNameA ()
   from /cygdrive/c/WINNT/system32/KERNEL32.DLL
(gdb) thread 
[Current thread is 3 (thread 1568.0x6a4)]
(gdb) thread 1
[Switching to thread 1 (thread 1568.0x630)]#0  0x7846376e in ntdll!ZwClose ()
   from /cygdrive/c/WINNT/System32/NTDLL.DLL
(gdb) bt
#0  0x7846376e in ntdll!ZwClose () from /cygdrive/c/WINNT/System32/NTDLL.DLL
#1  0x77e77738 in KERNEL32!CloseHandle ()
   from /cygdrive/c/WINNT/system32/KERNEL32.DLL
#2  0x61014fa7 in cygwin_internal () from /usr/bin/cygwin1.dll
#3  0x61056a77 in cygwin_winpid_to_pid () from /usr/bin/cygwin1.dll
#4  0x61079f46 in cygwin1!close () from /usr/bin/cygwin1.dll
#5  0x00425921 in ?? ()
#6  0x00000003 in ?? ()
#7  0x00000001 in ?? ()
#8  0x0022f96c in ?? ()
#9  0x00000001 in ?? ()
#10 0x00000001 in ?? ()
#11 0x00000002 in ?? ()
#12 0x00000001 in ?? ()
(gdb) thread 2
[Switching to thread 2 (thread 1568.0x4ec)]#0  0x784637b2 in ntdll!ZwWaitForMultipleObjects () from /cygdrive/c/WINNT/System32/NTDLL.DLL
(gdb) bt
#0  0x784637b2 in ntdll!ZwWaitForMultipleObjects ()
   from /cygdrive/c/WINNT/System32/NTDLL.DLL
#1  0x77e77ab7 in WaitForMultipleObjectsEx ()
   from /cygdrive/c/WINNT/system32/KERNEL32.DLL
#2  0x77e7a31d in WaitForMultipleObjects ()
   from /cygdrive/c/WINNT/system32/KERNEL32.DLL
#3  0x00adfe84 in ?? ()
#4  0x00000001 in ?? ()
(gdb)