Mail Archives: cygwin-developers/2002/08/05/13:40:49
On Mon, Aug 05, 2002 at 12:17:01PM -0400, Chris Faylor wrote:
> Nevermind. I checked in a fix, I hope. The moral of the story is that
> auto-reset events always seem to ensure a race. I keep trying to use
> them but every time I do, a race results.
I have still a situation which fails. I just tried a ssh localhost
which immediately died with a `connection reset by peer' message.
I tried the same with sshd started in debug mode on the command line.
ssh'ing to that sshd worked. But when logging out again, the sshd
suddenly hangs for a while (just a few seconds) and then it crashes
which starts gdb on my box. Unfortunately it's not visible what
exactly has happened.
The process has 10 threads, from which I can identify #1 as main thread,
#2 to #9 are threads[0-7] and #10 is unidentifiable.
#1, main, is just in start_thread_socket(), calling another `new cygthread'.
#2 == threads[0] is "sig", wait_sig()
#3 == threads[1] is "proc", wait_subproc()
#4 == threads[2] is "select_socket", thread_socket()
#5 == threads[3] has __name==NULL, thread_socket().
#6-#9 are in SuspendThread state in cygthread::stub.
#10 ??? The backtrace only contains two addresses in the system,
nothing else. I have no idea what it does.
Of course, the effect is not reproducible under strace. :-P
I removed the "error_start=..." from $CYGWIN and created an strace
that way:
Exception: STATUS_ACCESS_VIOLATION at eip=6106F16B
eax=00000010 ebx=610CA1F0 ecx=00C9FF64 edx=00000010 esi=7FFDD000 edi=00000000
ebp=00C9FF74 esp=00C9FF5C program=C:\cygwin\usr\sbin\sshd.exe
cs=001B ds=0023 es=0023 fs=0038 gs=0000 ss=0023
Stack trace:
Frame Function Args
00C9FF74 6106F16B (100C37D0, 00000000, 00000000, 00000001)
00C9FFB4 61004645 (610CA1F0, 00000000, 7FFDD000, 610CA1F0)
3 [select_socket] sshd 3080 handle_exceptions: Error while dumping state (probably corrupted stack)
addr2line gives:
6106F16B = select.cc:530
61004645 = cygthread.cc:45
Do you have a spontaneous inspiration what happens?
I'm now going to return to using gdb to see if I can figure out what happens.
Corinna
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