Message-ID: <421DA915.7020209@uni-duisburg.de>
Date: Thu, 24 Feb 2005 11:14:45 +0100
From: =?ISO-8859-1?Q?J=F6rn_Nettingsmeier?= <pol-admin@uni-duisburg.de>
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To: linux-kernel@vger.kernel.org
Cc: nettings@folkwang-hochschule.de
Subject: FUTEX deadlock in ping?
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hi !


disclaimer: i'm not a kernel guy ;)

after reading the FUTEX deadlock thread 
(http://thread.gmane.org/gmane.linux.kernel/280900), i was wondering:

ever since moving to ldap for passwd/group/shadow/hosts lookup, ping to 
a non-reachable host just freezes up and never returns:

spunk:~ # strace ping herrnilsson
execve("/bin/ping", ["ping", "herrnilsson"], [/* 61 vars */]) = 0
uname({sys="Linux", node="spunk", ...}) = 0
brk(0)                                  = 0x8063000
...
...
munmap(0x40504000, 4096)                = 0
brk(0x80a5000)                          = 0x80a5000
uname({sys="Linux", node="spunk", ...}) = 0
futex(0x401540f4, FUTEX_WAIT, 2, NULL
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

is this one related to the FUTEX problem olof described?


best,

j?rn


ps: i'd appreciate being cc:ed on replies. thanks.


for the record:

spunk:~ # uname -a
Linux spunk 2.6.8-24.11-smp #1 SMP Fri Jan 14 13:01:26 UTC 2005 i686 
i686 i386 GNU/Linux

SuSE 9.2

problem happens also on ia32 UP (same version as before) and amd64 UP 
(2.6.11-rc4-bk7)

ldap lookup is ok, for instance

spunk:~ # getent hosts herrnilsson
192.168.0.3     herrnilsson.villakunterbunt.netz herrnilsson

traceroute and others work as well.

on an otherwise identical system without ldap, ping correctly gives 
"unreachable" messages.

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