From: Andrea Arcangeli <andrea@suse.de>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: Hugh Dickins <hugh@veritas.com>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] anobjrmap 1/6 objrmap
Date: Sat, 20 Mar 2004 17:55:00 +0100 [thread overview]
Message-ID: <20040320165500.GW9009@dualathlon.random> (raw)
In-Reply-To: <2696880000.1079800826@[10.10.2.4]>
On Sat, Mar 20, 2004 at 08:40:27AM -0800, Martin J. Bligh wrote:
> OK, first I did the whole of -aa2, it boots OK, but panics as soon as I try
> to connect with ssh. I'll try the broken out bits next.
>
> M.
>
> Unable to handle kernel NULL pointer dereference at virtual address 00000003
> printing eip:
> c013f504
> *pde = 2e820001
> *pte = 00000000
> Oops: 0000 [#1]
> SMP
> CPU: 15
> EIP: 0060:[<c013f504>] Not tainted
> EFLAGS: 00010292 (2.6.5-rc1-aa2)
> EIP is at do_no_page+0xc4/0x45c
> eax: 00000000 ebx: 00000000 ecx: 00000000 edx: 00000000
> esi: ee5eea60 edi: ee5a3ec8 ebp: ee9c52a0 esp: ee5a3e94
> ds: 007b es: 007b ss: 0068
> Process sshd (pid: 19069, threadinfo=ee5a2000 task=ee69a870)
> Stack: 00000000 eeb43340 00000001 ee9c52a0 c3ba2820 00000000 40268000 ee5a3ec8
> ee9c52a0 ee69a870 ee5eea60 00000000 ef6a6134 00000001 c013fa0f ee9c52a0
> ee5eea60 40268000 00000001 eeb43340 eeea8008 ee9c52a0 ee69a870 ee5eea60
> Call Trace:
> [<c013fa0f>] handle_mm_fault+0xc7/0x190
> [<c0114fc3>] do_page_fault+0x13b/0x540
> [<c0114e88>] do_page_fault+0x0/0x540
> [<c0140feb>] do_mmap_pgoff+0x4b7/0x5fc
> [<c010d24b>] sys_mmap2+0x67/0x98
> [<c01075f9>] error_code+0x2d/0x38
>
> Code: 0f b6 41 03 8b 14 85 80 a9 35 c0 89 c8 2b 82 84 0b 00 00 69
this looks strange:
Code; c013f504 <filp_open+24/70>
00000000 <_EIP>:
Code; c013f504 <filp_open+24/70> <=====
0: 0f b6 41 03 movzbl 0x3(%ecx),%eax <=====
Code; c013f508 <filp_open+28/70>
4: 8b 14 85 80 a9 35 c0 mov 0xc035a980(,%eax,4),%edx
Code; c013f50f <filp_open+2f/70>
b: 89 c8 mov %ecx,%eax
Code; c013f511 <filp_open+31/70>
d: 2b 82 84 0b 00 00 sub 0xb84(%edx),%eax
Code; c013f517 <filp_open+37/70>
13: 69 00 00 00 00 00 imul $0x0,(%eax),%eax
%ecx is zero, not sure what can actually look at a 3 byte offset in
do_no_page (infact it looks like it was miscompiled), can you send me
your vmlinux privately (or just the the whole assembler for do_no_page)?
looking at my vmlinux asm (do_no_page C source is the same for both of
us) there's not a single movzbl instruction in the whole function and
I can't see any dereference at 0x3 offset either, nor I can see what
could generate that from the C code.
my compiler is:
Reading specs from /usr/lib/gcc-lib/i586-suse-linux/3.3.1/specs
Configured with: ../configure --enable-threads=posix --prefix=/usr
--with-local-prefix=/usr/local --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib
--enable-languages=c,c++,f77,objc,java,ada --disable-checking
--enable-libgcj --with-gxx-include-dir=/usr/include/g++
--with-slibdir=/lib --with-system-zlib --enable-shared
--enable-__cxa_atexit i586-suse-linux
Thread model: posix
gcc version 3.3.1 (SuSE Linux)
can you give a try with that one just in case? I made further use of
explicit regparm, old compiler miscompiles regparm.
next prev parent reply other threads:[~2004-03-20 16:54 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-18 23:21 [PATCH] anobjrmap 1/6 objrmap Hugh Dickins
2004-03-18 23:22 ` [PATCH] anobjrmap 2/6 linux/rmap.h Hugh Dickins
2004-03-18 23:23 ` [PATCH] anobjrmap 3/6 page->mapping Hugh Dickins
2004-03-18 23:25 ` [PATCH] anobjrmap 4/6 no pte_chains Hugh Dickins
2004-03-18 23:26 ` [PATCH] anobjrmap 5/6 anonmm Hugh Dickins
2004-03-19 16:15 ` Rik van Riel
2004-03-18 23:27 ` [PATCH] anobjrmap 6/6 cleanup Hugh Dickins
2004-03-19 2:42 ` [PATCH] anobjrmap 1/6 objrmap Andrea Arcangeli
2004-03-19 7:08 ` Hugh Dickins
2004-03-19 17:11 ` Martin J. Bligh
2004-03-20 12:30 ` Andrea Arcangeli
2004-03-20 14:03 ` William Lee Irwin III
2004-03-20 14:29 ` Andrea Arcangeli
2004-03-20 15:56 ` Martin J. Bligh
2004-03-20 16:19 ` Andrea Arcangeli
2004-03-20 16:40 ` Martin J. Bligh
2004-03-20 16:55 ` Andrea Arcangeli [this message]
2004-03-20 17:33 ` Martin J. Bligh
2004-03-20 18:50 ` Andrea Arcangeli
2004-03-21 16:30 ` Martin J. Bligh
2004-03-21 23:52 ` Andrea Arcangeli
2004-03-22 15:53 ` Martin J. Bligh
2004-03-24 6:19 ` Andrea Arcangeli
2004-03-24 15:56 ` Martin J. Bligh
2004-03-24 16:21 ` Andrea Arcangeli
2004-03-24 16:35 ` Martin J. Bligh
2004-03-24 17:08 ` Andrea Arcangeli
2004-03-24 20:00 ` William Lee Irwin III
2004-03-24 20:01 ` William Lee Irwin III
2004-03-24 20:17 ` William Lee Irwin III
2004-03-20 12:46 ` Andrea Arcangeli
2004-03-19 14:38 ` William Lee Irwin III
2004-03-22 20:37 ` [PATCH] anobjrmap 7/6 mremap moves Hugh Dickins
2004-03-22 21:52 ` Rajesh Venkatasubramanian
2004-03-26 14:29 ` [PATCH] anobjrmap 8/6 unmap nonlinear Hugh Dickins
2004-03-26 14:54 ` Realtek 8139too drivers Linux Kernel
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