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Re: CVS problem with ssh


From: Alexander Taler
Subject: Re: CVS problem with ssh
Date: Tue, 19 Jul 2005 23:26:03 -0400

>>>>> "Paul" == Paul Eggert <address@hidden> writes:
  Paul> To: Derek Price <address@hidden>
  Paul> Subject: Re: CVS problem with ssh
  Paul> Date: Sat, 16 Jul 2005 18:13:03 -0700

  Paul> OK, here's a proposed patch to CVS 1.12.12 for the CVS + ssh problem.
  Paul> It uses a pipe, but leaves stdio alone.

Hello,

I intermittently receive a failure in the test sshstdio-6 from sanity.sh on my
OpenBSD 3.6 sparc64 machine.  Am I correct in believing that this is the bug
under discussion?

In any case, I tried your patch Paul, but it did not correct the bug, instead
CVS just hangs.  I obtained stack traces from both the parent and child
processes, in a somewhat unorthodox way.  gdb would hang when I attempted to
attach it to the processes, so instead I sent SIGBUS to generate core files
(SIGABRT didn't work).  I am somewhat mystified by the stack traces, which is
why I haven't tried further debugging, but I am no system programmer.

I applied the patch to the HEAD of CVS, not to the 1.12.12 release itself, so
the line numbers may be slightly off.

Here's the stack trace from the parent:

(gdb) where
#0  0x0000000040c5b4c8 in vfork () from /usr/lib/libc.so.34.1
#1  0x0000000000156720 in piped_child (command=0xffffffffffffa010, 
tofdp=0xffffffffffffa00c, fromfdp=0xffffffffffffa008, fix_stderr=true) at 
run.c:558
#2  0x0000000000155638 in start_rsh_server (root=0x7d2000, 
to_server_p=0x7c49c8, from_server_p=0x7c49d0) at rsh-client.c:187
#3  0x0000000000113238 in open_connection_to_server (root=0x7d2000, 
to_server_p=0x7c49c8, from_server_p=0x7c49d0) at client.c:3906
#4  0x00000000001132ec in start_server () at client.c:3967
#5  0x000000000011aa44 in diff (argc=1, argv=0x7c8248) at diff.c:410
#6  0x0000000000139a04 in main (argc=10, argv=0x7c8200) at main.c:1066


And from the child:

(gdb) where
#0  0x00000000435ddc28 in read () from /usr/lib/libc.so.34.1
#1  0x00000000001563ac in work_around_openssh_glitch () at run.c:482
#2  0x0000000000156874 in piped_child (command=0xffffffffffffaac0, 
tofdp=0xffffffffffffaabc, fromfdp=0xffffffffffffaab8, fix_stderr=true) at 
run.c:576
#3  0x0000000000155638 in start_rsh_server (root=0x7d2000, 
to_server_p=0x7c49c8, from_server_p=0x7c49d0) at rsh-client.c:187
#4  0x0000000000113238 in open_connection_to_server (root=0x7d2000, 
to_server_p=0x7c49c8, from_server_p=0x7c49d0) at client.c:3906
#5  0x00000000001132ec in start_server () at client.c:3967
#6  0x000000000011aa44 in diff (argc=1, argv=0x7c8248) at diff.c:410
#7  0x0000000000139a04 in main (argc=10, argv=0x7c8200) at main.c:1066


Also, I may not be responding to email for the next week, but I will certainly
do what I can when I can get to the network.

Alex

-- 
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