On Oct 21 08:24, Barry Roberts wrote: > Attached is the strace output. Thanks. The culprit are apparently some weird User and Group SIDs. 34 22501 [main] ls 3428 build_fh_pc: fh 0x180329B20, dev 000000C3 26 22527 [main] ls 3428 stat_worker: (\??\M:\install, 0x600039B40, 0x180329B20), file_attributes 16 539 23066 [main] ls 3428 cygpsid::debug_print: get_sids_info: owner SID = S-1-81-0-0 39 23105 [main] ls 3428 cygpsid::debug_print: get_sids_info: group SID = S-1-0 227 23332 [main] ls 3428 pwdgrp::fetch_account_from_windows: LookupAccountSid(S-1-81-0-0), Win32 error 1332 36 23368 [main] ls 3428 pwdgrp::fetch_account_from_windows: line: 198 23566 [main] ls 3428 pwdgrp::fetch_account_from_windows: LookupAccountSid(S-1-0), Win32 error 1332 34 23600 [main] ls 3428 pwdgrp::fetch_account_from_windows: line: --- Process 3428, exception c0000005 at 00007FFA1856A774 Granted, it's not nice of Cygwin to SEGV here, but I do wonder where the SIDs S-1-81-0-0 and S-1-0 are coming from. They are both invalid as far as I can see. Hmm. The problem is to reproduce this to find out where this happens. The exception address is inside a Windows DLL :-P Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat