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A vexing installation problem


A couple days ago, I tried to update a quite old cygwin installation
on a Windows XP SP2 box to the latest (1.5.12-1).  After the update,
all Cygwin programs exit immediately and silently.  I've tried
scrubbing the Windows registry of anything with a "Cyg" in it,
deleting the Cygwin tree, and reinstalling from scratch, with the same
result.  Running "strace" on any Cygwin program shows apparently
normal output (as far as I can tell) up to a point; and then zippo.

For example, here's the end of 'strace ls':

  149   42033 [main] ls 4072 pwdgrp::load: /etc/group
  140   42173 [main] ls 4072 pwdgrp::load: strange path_conv problem
  140   42313 [main] ls 4072 pwdgrp::load: /etc/group load failed
  152   42465 [main] ls 4072 __cygwin_lock_lock: threadcount 1.  not locking
  151   42616 [main] ls 4072 __cygwin_lock_unlock: threadcount 1.  not unlocking
  148   42764 [main] ls 4072 pwdgrp::read_group: Completing /etc/group: mkpasswd:S-1-5-21-1844237615-725345543-682003330-513:401:dhinds
  442   43206 [main] ls 4072 cygheap_user::ontherange: what 2, pw 0x10011018
  147   43353 [main] ls 4072 cygheap_user::ontherange: HOME is already in the environment /cygdrive/h
  684   44037 [main] ls 4072 sigproc_init: process/signal handling enabled(1)
  176   44213 [main] ls 4072 __cygwin_lock_lock: threadcount 1.  not locking
  167   44380 [main] ls 4072 __cygwin_lock_unlock: threadcount 1.  not unlocking

Some commands get as far as executing build_argv().  I'm not sure what
to do next: has anyone seen anything like this before?  Or, can anyone
suggest how to go about debugging this?

-- Dave

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