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Date: Mon, 26 Nov 2001 17:13:00 -0600 (CST)
From: Eduardo R Larranaga <Eduardo DOT R DOT Larranaga AT syntegra DOT com>
To: cygwin AT cygwin DOT com
Subject: sshd and tcsh STATUS_ACCESS_VIOLATION stackdump
Message-Id: <Pine.GSO.3.96.1011126170924.27476K-100000@minnesota.arh.ms.cdc.com>
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I am seeing sporadic stacktrace dumps from sshd and tcsh.  I can reproduce
the tcsh problem more or less at will (fails about 30% of the time) by
executing:

  % tcsh -c "ls /"

The sshd dumps occur sporadically when ssh-ing into the system - also
about 30% of the time.

I have gotten strace outputs but don't know how to read them.

Facts:

- cygwin  : 1.3.5-2
- openssh : 3.0.1p1-1
- tcsh    : 6.10.00-3

- OS: NT 4.0 SP6
- %SYSTEMDRIVE% is M: - "M:\" mounted on "/"

Observations:

- Once I get an sshd/tcsh session running it stays up and looks normal - it
  seems to be an issue at "initialization" time.

- Since both sshd and tcsh are failing it seems to point to cygwin1.dll.

- Problem did not occur with cygwin 1.3.2.

- It seems like this is load or concurrency dependent - if I run multiple
  copies of tcsh like this it happens much more often:

    % tcsh -c "ls /" & ; tcsh -c "ls /"

Trace:

Exception: STATUS_ACCESS_VIOLATION at eip=6106483A
eax=7FFDE000 ebx=00000000 ecx=00000000 edx=00000004 esi=00000000 edi=02461A94
ebp=024615F8 esp=024615E0 program=M:\EMC\bin\tcsh.exe
cs=001B ds=0023 es=0023 fs=0038 gs=0000 ss=0023
Stack trace:
Frame     Function  Args
024615F8  6106483A  (02461AF4, 00000001, 000000C8, 00000000)
02461AA4  6102721C  (02461C34, 02461C38, 02461C3C, 02461ACC)
02461C44  61027AA6  (0043B6C4, 0A01B128, 0A01B0E8, 0A01B128)
02461C74  00418E55  (0A01B128, FFFFFFFF, 00000002, 00000000)
02462124  0041970B  (0A01B128, FFFFFFFF, 00000000, 02462164)
024625D4  00419922  (0A01B108, FFFFFFFF, 00000000, 00000000)
02462A84  00419A14  (0A01B0E8, FFFFFFFF, 00000000, 00000000)
02465B04  0041078E  (0A012F88, 00000000, 0246AB44, 0041055A)
0246AB44  00410575  (0A01C008, 00000000, 00000078, 0246ABAC)
0246CB94  0040FAAD  (0246CBD0, 00464D4C, 0A01B80A, 00000000)
0246CBD4  00410068  (0A01C008, 00000002, 0246CC34, 00410053)
0246CC34  0040BB5B  (0246D16C, 00000000, 61696C61, 5F5F2073)
0246CC94  0040B8B8  (0246D16C, 00000000, 25647763, 0A272220)
0246CCD4  0040B70B  (0246D16C, 00000000, 0246CD14, 0041562F)
0246CD14  0040B630  (0246D16C, 00000000, 0246CD4C, 58452E46)
0246CD44  0040B55D  (0246D16C, 00000000, 0246CD74, 004109DC)

****

Is there anything I can do in this reproducible environment to help isolate
the problem?

--Ed


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