Preremove/postinstall scripts fail with snapshot installed

[Ken Brown]

If I run setup.exe with a cygwin snapshot installed, bash crashes while 
running all preremove and postinstall scripts.  Here's a typical error 
message in /var/log/setup.log.full:

2011/02/11 15:56:55 running: C:\cygwin\bin\bash.exe --norc --noprofile 
/etc/preremove/emacs-X11.sh
       0 [main] bash 2760 exception::handle: Exception: 
STATUS_ACCESS_VIOLATION
    1739 [main] bash 2760 open_stackdumpfile: Dumping stack trace to 
bash.exe.stackdump

I can reproduce this on two different Win7 machines, but the problem 
doesn't occur on a third machine running XP SP3.  I'm attaching cygcheck 
output from one of the Win7 machines, as well as a bash stackdump.

I've tested this on the latest snapshot (2011-02-07) as well as the 
2010-12-01 snapshot.  I haven't yet had a chance to test earlier 
snapshots to see where the problem first occurs, but I'll try to do that 
over the weekend.  The problem does not occur under cygwin 1.7.7.

Ken
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