Re: FUTEX deadlock in ping?

[Joern Nettingsmeier]

hi bert!

thanks for your reply.

bert hubert wrote:
> On Thu, Feb 24, 2005 at 11:14:45AM +0100, J?rn Nettingsmeier wrote:
>
>
> > 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
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
>
> Try ping -n. This is most likely something else.

hmm. ping -n would still have to look up the hostname, and indeed the 
strace is identical (hanging). but when i ping the ip (this is probably 
what you had in mind), it works as expected.

anyway, why would a process block endlessly in a futex?


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/