Re: sshd fork failure

[Christopher Faylor <cgf-use-the-mailinglist-please@cygwin.com>]

On Sat, Oct 13, 2012 at 06:10:23PM +0200, marco atzeri wrote:
>On 10/13/2012 5:39 PM, Christopher Faylor wrote:
>> On Thu, Aug 30, 2012 at 06:44:39PM +0200, marco atzeri wrote:
>>> Hi,
>>> tracing the sshd process on latest cygwin shapshot ,
>>> I see that the fork is failing due to exception C0000005
>>>
>>>      1       1 [main] sshd (4644)
>>> **********************************************
>>>   5921    5922 [main] sshd (4644) Program name:
>>> E:\cygwin\usr\sbin\sshd.exe (windows pid 4644)
>>>     30    5952 [main] sshd (4644) OS version:   Windows NT-6.1
>>>     25    5977 [main] sshd (4644)
>>> **********************************************
>>>    636    6613 [main] sshd (4644) sigprocmask: 0 = sigprocmask (0,
>>> 0x6123D428, 0x610FBB30)
>>>    122    6735 [main] sshd 4644 child_copy: cygheap - hp 0x20C low
>>> 0x612708D0, high 0x61277640, res 1
>>>   1368    8103 [main] sshd 4644 child_copy: done
>>> --- Process 4644, exception C0000005 at 61137277
>>>
>>>
>>>
>>> $ addr2line.exe 61137277 -e /usr/bin/cygwin1.dll
>>> /netrel/src/cygwin-snapshot-20120827-1/newlib/libc/stdlib/mbtowc_r.c:323
>>>
>>> that should be:
>>>
>>>   ch = (state->__count == 1) ? t[i++] : state->__value.__wchb[1];
>>>
>>> inside __utf8_mbtowc .
>>> It looks a strange place for a fork failure, but it is used in
>>> winsup/cygwin/cygheap.cc so it could make sense.
>>>
>>> Any suggestion how to follow/debug the child portion of fork ?
>>
>> Is this still failing?  We're looking to release 1.7.17 soon.
>
>on  20121012 similar but in another location.
>
>--- Process 6280, exception C0000005 at 61137DC8
>   427  147466 [main] sshd 6280 exception::handle: In 
>cygwin_except_handler exception 0xC0000005 at 0x61137DC8 sp 0x289270
>    67  147533 [main] sshd 6280 exception::handle: In 
>cygwin_except_handler signal 11 at 0x61137DC8
>    38  147571 [main] sshd 6280 exception::handle: In 
>cygwin_except_handler calling 0x0
>    37  147608 [main] sshd 6280 exception::handle: Exception: 
>STATUS_ACCESS_VIOLATION
>
>  addr2line.exe 61137DC8 -e /usr/bin/cygwin1.dll
>/netrel/src/cygwin-snapshot-20121012-1/newlib/libc/stdio/findfp.c:296

You seem to be the only person reporting this problem.  Everyone else
updates to a snapshot to cure ssh problems.  FWIW, that instruction
shouldn't even be executed.

cgf

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