Re: 2.6.10 devfs oops without devfs mounted at all

["Sergey S. Kostyliov" <rathamahata@ehouse.ru>]

On Thursday 10 February 2005 12:49, Sergey S. Kostyliov wrote:
> On Thursday 10 February 2005 03:36, Andrew Morton wrote:
> > "Sergey S. Kostyliov" <rathamahata@ehouse.ru> wrote:
> > >
> > > Here is an oops I've just get on my smp system:
> > > 
> > > Unable to handle kernel NULL pointer dereference at virtual address 0000001c
> > >  printing eip:
> > > c01afe5b
> > > *pde = 00000000
> > > Oops: 0000 [#1]
> > > PREEMPT SMP
> > > Modules linked in: ipt_REJECT ipt_state ip_conntrack iptable_filter
> > > CPU:    2
> > > EIP:    0060:[<c01afe5b>]    Not tainted VLI
> > > EFLAGS: 00010286   (2.6.10)
> > > EIP is at devfsd_close+0x1b/0xc8
> > > eax: f7440a00   ebx: 00000000   ecx: c01afe40   edx: ed395280
> > > esi: 00000000   edi: f7f17800   ebp: f74f96c8   esp: cdc70f84
> > > ds: 007b   es: 007b   ss: 0068
> > > Process megamgr.bin (pid: 12844, threadinfo=cdc70000 task=dd81e520)
> > > Stack: ed395280 ed395280 00000000 f7f17800 c0150c76 ee9e87f8 ed395280 00000000
> > >        f1985c80 cdc70000 c014f50f 00000003 00000003 080caa60 00000000 c01024df
> > >        00000003 080cc700 bfffe4f8 080caa60 00000000 bfffe4fc 00000006 0000007b
> > > Call Trace:
> > >  [<c0150c76>] __fput+0x106/0x120
> > >  [<c014f50f>] filp_close+0x4f/0x80
> > >  [<c01024df>] syscall_call+0x7/0xb
> > 
> > Can you work out what file is being closed?  One way of doing that would be
> > to work out how megamgr.bin is being invoked and to then run it by hand:
> > 
> >  strace -f -o log megamgr.bin <args>
> > 
> > and we can then use the strace output to work out the pathname of the
> > offending file.
> 
> rathamahata@terror rathamahata $ grep 'open(' mg.log
> 5255  open("/usr/share/terminfo/l/linux", O_RDONLY) = 3
> 5255  open("/dev/megadev0", O_RDONLY)   = 3
> rathamahata@terror rathamahata $
Sorry, I forgot this part:
rathamahata@terror rathamahata $ grep 'close(' mg.log
5255  close(3)                          = 0
rathamahata@terror rathamahata $

> 
> I guess it's /dev/megadev0 (manually created character device)
> 
> rathamahata@terror rathamahata $ ls -la /dev/megadev0
> crw-r--r--  1 root root 253, 0 Feb  8 16:26 /dev/megadev0
> rathamahata@terror rathamahata 
> 

-- 
Sergey S. Kostyliov <rathamahata@ehouse.ru>
Jabber ID: rathamahata@jabber.org