Re: Hanging udev process on nfs-mounted /dev

[Kay Sievers <kay.sievers@vrfy.org>]

On Sun, 2004-10-03 at 23:10 +0200, Frank Steiner wrote:
> Hi,
> 
> I got two hosts locked with those hanging udev processes. I can leave
> them in this state for at least the whole Monday.
> 
> Kay Sievers wrote
> 
> > This may be the process that blocks all the other ones. If you can find
> > one of these beasts, please attach gdb to the running process and look
> > if we find something in the backtrace. Here is a sample from my
> > "lock the whole file"-test application:
> > 
> > * [root@pim ~]# gdb -p 14727
> >   Copyright 2004 Free Software Foundation, Inc.
> >   GDB is free software, covered by the GNU General Public License, and you are
> >   welcome to change it and/or distribute copies of it under certain conditions.
> >   Type "show copying" to see the conditions.
> >   There is absolutely no warranty for GDB.  Type "show warranty" for details.
> >   Attaching to process 14727
> >   ...
> >   Reading symbols from /home/kay/src/lock...(no debugging symbols found)...done.
> >   Reading symbols from /lib/ld-linux.so.2...(no debugging symbols   found)...done.
> >   Loaded symbols for /lib/ld-linux.so.2
> >   0x0804839f in spin ()
> > * (gdb) bt
> >   #0  0x0804839f in spin ()
> >   #1  0x08048405 in main ()
> > * (gdb) q
> >   The program is running.  Quit anyway (and detach it)? (y or n) y
> >   Detaching from program: /home/kay/src/lock, process 14727
> >   [root@pim ~]# 
> 
> Unfortunately, this fails :-(
> 
> GNU gdb 5.3.92
> Copyright 2003 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i586-suse-linux".
> Attaching to process 24498
> ptrace: Operation not permitted.
> /export/localhome/root/24498: No such file or directory.
> 
> 
>  From googling I learned that this could be a problem with child processes
> that were forked or sth. similar...

Oh, bad.
It's your running strace that prevents gbd to take the control over the
process, I expect. Just try to send the strace parent-process a SIGUSR1
which may leave the udev process running.

Thanks,
Kay



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