linux-kernel - Re: futex hang with rpm in 2.6.17.1-2174

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Date:	Sat, 21 Oct 2006 10:45:02 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Dave Jones <davej@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: futex hang with rpm in 2.6.17.1-2174_FC5

Dave Jones wrote:
> On Fri, Oct 20, 2006 at 11:38:58AM -0700, Ben Greear wrote:
>  > I had a dead nfs server that was causing some programs to pause,
>  > in particular 'yum install foo' was paused.  I kill -9'd the
>  > yum related processes.
>  > 
>  > I fixed up the nfs server and was able to un-mount the file system.
>  > I subsequently killed many backed up updatedb and similar processes.
>  > 
>  > Now, there are no rpm processes, but if I try 'rpm [anything]' it
>  > hangs trying to open a futex:
>  > 
>  > open("/var/lib/rpm/Packages", O_RDONLY|O_LARGEFILE) = 4
>  > fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
>  > fstat64(4, {st_mode=S_IFREG|0644, st_size=41390080, ...}) = 0
>  > futex(0xb7ba178c, FUTEX_WAIT, 1, NULL <unfinished ...>
>  > 
>  > Is there any way to figure out what is causing this futex-wait?
>
> The dead rpm you killed left behind locks in its databases.
> rm -f /var/lib/rpm/__db* and it should work again.
>   
I'll give that a try, but shouldn't these locks clean themselves up when the
process is killed or shouldn't rpm notice the previous process is dead and
clean it up itself?

Thanks,
Ben

> 	Dave
>
>   


-- 
Ben Greear <greearb@...delatech.com> 
Candela Technologies Inc  http://www.candelatech.com


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