rxvt & emacs runs, but bash and others fail with STATUS_ACCESS_VIOLATION

[David M. Karr]

uname -a: CYGWIN_NT-6.1 Wondark 1.7.9(0.237/5/3) 2011-03-29 10:10 i686 
Cygwin

I'm now in a situation where rxvt and Emacs runs, but the bash that rxvt 
runs fails with something like this:
---------------
       0 [main] bash 7844 exception::handle: Exception: 
STATUS_ACCESS_VIOLATION
     394 [main] bash 7844 open_stackdumpfile: Dumping stack trace to 
bash.exe.stackdump
       1 [main] bash 6052 fork: child -1 - died waiting for longjmp 
before initialization, retry 0, exit code 0x8B00, errno 11
bash: fork: retry: Resource temporarily unavailable
1024231 [main] bash 7196 exception::handle: Exception: 
STATUS_ACCESS_VIOLATION
1025315 [main] bash 7196 open_stackdumpfile: Dumping stack trace to 
bash.exe.stackdump
---------------

When I try to run "shell" in Emacs, it sometimes starts up, but doing 
anything in the shell fails with a similar error.  Sometimes I simply 
get "Doing vfork: resource temporarily unavailable", and the shell 
refuses to start.

When I ran "cygcheck -s -v -r > cygcheck.out", I saw this on stderr:

/usr/bin/cygrunsrv: warning: OpenService failed for 'DcomLaunch': Win32 
error 5
Access is denied.
/usr/bin/cygrunsrv: warning: OpenService failed for 'pla': Win32 error 5
Access is denied.
/usr/bin/cygrunsrv: warning: OpenService failed for 'QWAVE': Win32 error 5
Access is denied.
/usr/bin/cygrunsrv: warning: OpenService failed for 'RpcEptMapper': 
Win32 error 5
Access is denied.
/usr/bin/cygrunsrv: warning: OpenService failed for 'RpcSs': Win32 error 5
Access is denied.

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