FUTEX deadlock in ping?

["Jörn Nettingsmeier" <pol-admin@uni-duisburg.de>]

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,

jörn


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.