Best way to repair cygwin?

["Ronald Fischer" <ynnor at mm dot st>]

Cygwin worked well so far. However, starting with today, I get the
following error - for example when invoking bash:

MUCNL3E6880:~ 2 23 $ bash --norc
    163 [main] bash 5788 exception::handle: Exception:
    STATUS_ACCESS_VIOLATION
   1958 [main] bash 5788 open_stackdumpfile: Dumping stack trace to
   bash.exe.stackdup

When doing a

   zsh -f

this works at first, but as soon as I do a

  man man

in the shell, I get

9420794 [main] sh 8004 exception::handle: Exception:
STATUS_ACCESS_VIOLATION
Exception: STATUS_ACCESS_VIOLATION at eip=6102048B
eax=009DD298 ebx=61246414 ecx=758E7B6E edx=003F51F8 esi=00000000
edi=0022FA10
ebp=61020C00 esp=0022C7E0 program=C:\cygwin\bin\sh.exe, pid 8004, thread
main
cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
Stack trace:
Frame     Function  Args
End of stack trace
9455844 [main] sh 5776 exception::handle: Exception:
STATUS_ACCESS_VIOLATION
9458931 [main] sh 5776 open_stackdumpfile: Dumping stack trace to
sh.exe.stackdump
9487143 [main] sh 348 exception::handle: Exception:
STATUS_ACCESS_VIOLATION
9490092 [main] sh 348 open_stackdumpfile: Dumping stack trace to
sh.exe.stackdump
9494562 [main] sh 1860 fork: child -1 - died waiting for longjmp before
initializatio
n, retry 0, exit code 0x8B00, errno 11
sh: fork: retry: Resource temporarily unavailable
... 
(and so on, in a endless loop).

I wonder why zsh is invoking "sh.exe" implicitly, when I just call
"man", but in any case the error message suggests that bash.exe / sh.exe
is broken.

I had run setup again yesterday evening, in order to install wcd (found
in the util section). The setup run to the end without error message,
and I switched off the PC. Today I found bash broken. Since wcd utility
is an extension to the chdir command, it is conceivable that it fiddled
around with bash somehow, but I consider it unlikely that this would
cause the effect I am observing: Such an obvious bug would not have been
unnoticed.

I wonder whether there is an easy way to "repair" Cygwin (maybe a
procedure to automatically re-install everything). I searched on the Net
but didn't find anything in this direction. Any other idea what I could
do?

Ronald
-- 
Ronald Fischer <ronaldf@eml.cc>
+  If a packet hits a pocket on a socket on a port, 
+  and the bus is interrupted and the interrupt's not caught,
+  then the socket packet pocket has an error to report.
+		(cited after Peter van der Linden)


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