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From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: ls.exe hangs on inaccessible directory if ntsec is turned off
Date: Fri, 3 Mar 2006 19:39:00 -0000
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On 03 March 2006 17:13, Dave Korn wrote:

> On 03 March 2006 16:39, Christian Franke wrote:

>> Steps to reproduce on XP Prof:

>> $ CYGWIN=nontsec ls "/cygdrive/c/System Volume Information"
>> ls: /cygdrive/c/System Volume Information: Permission denied
>> # *** ls hangs with 100% CPU ***
>> 
>> Bug is present since cygwin1.dll 20050128, 20050127 was OK.

>   It appears to be running to completion and then hitting an infinite loop
> at 
> 
> (gdb) info symbol 0x61002148
> _cfree AT 4 + 40 in section .text
> 
> which is called from exit().  Can't do better than that yet, I can't seem to
> get these separate .dll/.dbg files to play together right now...


  OK, there's been an exception.  It keeps on hitting 

_cygtls::handle_exceptions(_EXCEPTION_RECORD*, _exception_list*, _CONTEXT*,
void *)

which returns 1 (EXCEPTION_EXECUTE_HANDLER).  Not quite sure what happens next
or how it got there, but the SEH chain is looping:


0:000> t
eax=00000000 ebx=0022fbb8 ecx=00000000 edx=7c9037d8 esi=0022e7f8 edi=00000001
eip=7c92aa1b esp=0022e770 ebp=0022e7e0 iopl=0         nv up ei pl zr na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000246
ntdll!RtlDispatchException+0x139:
7c92aa1b 8b1b             mov     ebx,[ebx]         ds:0023:0022fbb8=0022fbb8
0:000> t
eax=00000000 ebx=0022fbb8 ecx=00000000 edx=7c9037d8 esi=0022e7f8 edi=00000001
eip=7c92aa1d esp=0022e770 ebp=0022e7e0 iopl=0         nv up ei pl zr na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000246
ntdll!RtlDispatchException+0x13b:
7c92aa1d 83fbff           cmp     ebx,0xffffffff
0:000> t
eax=00000000 ebx=0022fbb8 ecx=00000000 edx=7c9037d8 esi=0022e7f8 edi=00000001
eip=7c92aa20 esp=0022e770 ebp=0022e7e0 iopl=0         nv up ei pl nz ac pe cy
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000213
ntdll!RtlDispatchException+0x13e:
7c92aa20 0f846cce0000   je ntdll!RtlDispatchException+0x150 (7c937892) [br=0]
0:000> t
eax=00000000 ebx=0022fbb8 ecx=00000000 edx=7c9037d8 esi=0022e7f8 edi=00000001
eip=7c92aa26 esp=0022e770 ebp=0022e7e0 iopl=0         nv up ei pl nz ac pe cy
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000213
ntdll!RtlDispatchException+0x144:
7c92aa26 e9dacd0000       jmp     ntdll!RtlDispatchException+0x49 (7c937805)
0:000> dd ebx
0022fbb8  0022fbb8 61018630 00000000 00000000

and it's running round and round calling the SEH filter over and over and over
again.  Will post more as I get it.


    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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