Message-Id: <20060909112724.a214197b.akpm@osdl.org>
Date:	Sat, 9 Sep 2006 11:27:24 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Magnus Määttä <novell@...una.se>
Cc:	linux-kernel@...r.kernel.org, Neil Brown <neilb@....unsw.edu.au>
Subject: Re: 2.6.18-rc6-mm1

On Sat, 9 Sep 2006 14:45:32 +0200
Magnus Määttä <novell@...una.se> wrote:

> Hi Andrew,
> 
> Sorry, forgot to CC lkml when I sent the first one.
> 
> Andrew Morton wrote:
> > 
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc6/2.6.18-rc6-mm1/
> > 
> > - autofs4 mounting of NFS is still sick.
> 
> I got this oops on my machine when I ran df on another one which have 
> mounted a few NFS shares from my machine. I got 5 more pretty much 
> identical ones within 10 seconds after the first one (haven't seen 
> any more after these though). Also, dmesg is filled with, about a 
> gazillion of these:
> [15164.017991] RPC request reserved 9136 but used 9268
> [15164.037431] RPC request reserved 9136 but used 9268
> [15164.052988] RPC request reserved 9136 but used 9268
> 
> Files are also getting corrupted when transfered from my machine, but 
> using my machine as client works fine.

OK, so the NFS server isn't happy.

> oops here:
> 
> Error (regular_file): read_ksyms stat /proc/ksyms failed

You don't need to run ksymoops at all in 2.6 - simply enable
CONFIG_KALLSYMS and the kernel does the rest.

> No modules in ksyms, skipping objects
> No ksyms, skipping lsmod
> BUG: unable to handle kernel NULL pointer dereference at virtual 
> address 00000000
> c04ad300
> *pde = 00000000
> Oops: 0000 [#1]
> CPU:    0
> EIP:    0060:[<c04ad300>]    Tainted: P      VLI

What caused the taint?

> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00210212   (2.6.18-rc6-mm1 #1)
> eax: 00000000   ebx: e5299000   ecx: 00000000   edx: e8843620
> esi: e5299070   edi: ffff84de   ebp: e52a0fb0   esp: e52a0f70
> ds: 007b   es: 007b   ss: 0068
> Stack: 00200046 eb499aa0 00000001 eb499a84 00000000 e52a0f9c c04eaa1b 
> eb499a84
>        00000001 e8843620 e529904c e52a0fb0 c012d70b 00000002 ffff84de 
> ffff84de
>        e52a0fe0 c02784ba e5299000 e52a0fc4 00000000 fffffeff ffffffff 
> fffffef8
> Call Trace:
>  [<c01041bf>] show_trace_log_lvl+0x2f/0x50
>  [<c01042a7>] show_stack_log_lvl+0x97/0xc0
>  [<c0104532>] show_registers+0x1f2/0x2a0
>  [<c01047dd>] die+0x12d/0x240
>  [<c011735c>] do_page_fault+0x3ac/0x650
>  [<c04eaeef>] error_code+0x3f/0x44
>  [<c02784ba>] nfsd+0x18a/0x2b0
>  [<c0103fb7>] kernel_thread_helper+0x7/0x10
> Code: 89 45 e8 8b 52 28 83 c6 70 89 55 e4 8b 40 04 83 f8 17 0f 86 6d 
> 04 00 00 8b 5d 08 8b 83 9c 04 00 00 c7 83 a0 04 00 00 01 00 00 00 
> <8b> 00 89 04 24 e8 06 d4 ca ff c7 46 04 00 00 00 00 89 c1 89 43
> 
> 
> >>EIP; c04ad300 <svc_process+40/6a0>   <=====
> 
> Trace; c01041bf <show_trace_log_lvl+2f/50>
> Trace; c01042a7 <show_stack_log_lvl+97/c0>
> Trace; c0104532 <show_registers+1f2/2a0>
> Trace; c01047dd <die+12d/240>
> Trace; c011735c <do_page_fault+3ac/650>
> Trace; c04eaeef <error_code+3f/44>
> Trace; c02784ba <nfsd+18a/2b0>
> Trace; c0103fb7 <kernel_thread_helper+7/10>
> 
> This architecture has variable length instructions, decoding before 
> eip
> is unreliable, take these instructions with a pinch of salt.
> 
> Code;  c04ad2d5 <svc_process+15/6a0>
> 00000000 <_EIP>:
> Code;  c04ad2d5 <svc_process+15/6a0>
>    0:   89 45 e8                  mov    %eax,0xffffffe8(%ebp)
> Code;  c04ad2d8 <svc_process+18/6a0>
>    3:   8b 52 28                  mov    0x28(%edx),%edx
> Code;  c04ad2db <svc_process+1b/6a0>
>    6:   83 c6 70                  add    $0x70,%esi
> Code;  c04ad2de <svc_process+1e/6a0>
>    9:   89 55 e4                  mov    %edx,0xffffffe4(%ebp)
> Code;  c04ad2e1 <svc_process+21/6a0>
>    c:   8b 40 04                  mov    0x4(%eax),%eax
> Code;  c04ad2e4 <svc_process+24/6a0>
>    f:   83 f8 17                  cmp    $0x17,%eax
> Code;  c04ad2e7 <svc_process+27/6a0>
>   12:   0f 86 6d 04 00 00         jbe    485 <_EIP+0x485>
> Code;  c04ad2ed <svc_process+2d/6a0>
>   18:   8b 5d 08                  mov    0x8(%ebp),%ebx
> Code;  c04ad2f0 <svc_process+30/6a0>
>   1b:   8b 83 9c 04 00 00         mov    0x49c(%ebx),%eax
> Code;  c04ad2f6 <svc_process+36/6a0>
>   21:   c7 83 a0 04 00 00 01      movl   $0x1,0x4a0(%ebx)
> Code;  c04ad2fd <svc_process+3d/6a0>
>   28:   00 00 00 
> 
> This decode from eip onwards should be reliable
> 
> Code;  c04ad300 <svc_process+40/6a0>
> 00000000 <_EIP>:
> Code;  c04ad300 <svc_process+40/6a0>   <=====
>    0:   8b 00                     mov    (%eax),%eax   <=====
> Code;  c04ad302 <svc_process+42/6a0>
>    2:   89 04 24                  mov    %eax,(%esp)
> Code;  c04ad305 <svc_process+45/6a0>
>    5:   e8 06 d4 ca ff            call   ffcad410 <_EIP+0xffcad410>
> Code;  c04ad30a <svc_process+4a/6a0>
>    a:   c7 46 04 00 00 00 00      movl   $0x0,0x4(%esi)
> Code;  c04ad311 <svc_process+51/6a0>
>   11:   89 c1                     mov    %eax,%ecx
> Code;  c04ad313 <svc_process+53/6a0>
>   13:   89                        .byte 0x89
> Code;  c04ad314 <svc_process+54/6a0>
>   14:   43                        inc    %ebx
> 
> EIP: [<c04ad300>] svc_process+0x40/0x6a0 SS:ESP 0068:e52a0f70
> Warning (Oops_read): Code line not seen, dumping what data is 
> available
> 
> 
> >>EIP; c04ad300 <svc_process+40/6a0>   <=====
> 
> 
> 2 warnings and 1 error issued.  Results may not be reliable.
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