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From: Mikael Pettersson <mikpe@csd.uu.se>
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Date: Fri, 17 Jan 2003 14:49:02 +0100
To: Brian Gerst <bgerst@didntduck.org>
Cc: kai@tp1.ruhr-uni-bochum.de, rusty@rustcorp.com.au,
       linux-kernel@vger.kernel.org
Subject: Re: 2.5.59 vmlinux.lds.S change broke modules
In-Reply-To: <3E2808D4.3030200@quark.didntduck.org>
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	<3E2808D4.3030200@quark.didntduck.org>
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Brian Gerst writes:
 > Mikael Pettersson wrote:
 > > Previously today I wrote:
 > >  > 2.5.59 with CONFIG_PACKET=m oopes when af_packet.ko is insmodded:
 > >  > 
 > >  > Unable to handle kernel paging request at virtual address 2220c021
 > >  >  printing eip:
 > >  > c0124011
 > >  > *pde = 00000000
 > >  > Oops: 0000
 > >  > CPU:    0
 > >  > EIP:    0060:[<c0124011>]    Not tainted
 > >  > EFLAGS: 00010097
 > >  > EIP is at __find_symbol+0x3d/0x7c
 > >  > eax: c020f70e   ebx: 00000536   ecx: 00000000   edx: c028b600
 > >  > esi: 2220c021   edi: e8889558   ebp: e8889558   esp: e67c5ecc
 > >  > ds: 007b   es: 007b   ss: 0068
 > >  > Process insmod (pid: 482, threadinfo=e67c4000 task=e6c80ce0)
 > >  > Stack: e8888f34 e8889a40 00000038 e8883f50 c0124960 e8889558 e67c5ef4 00000001 
 > >  >        e8888f34 e8889374 e67c5f28 c0124b2a e8883f50 00000016 e8889374 e8889558 
 > >  >        e8889a40 e8883f50 0000000c 00000017 e8889a40 00000000 0000007c c01253a4 
 > >  > Call Trace:
 > >  >  [<c0124960>] resolve_symbol+0x20/0x4c
 > >  >  [<c0124b2a>] simplify_symbols+0x82/0xe4
 > >  >  [<c01253a4>] load_module+0x5c4/0x7ec
 > >  >  [<c012562b>] sys_init_module+0x5f/0x194
 > >  >  [<c0108887>] syscall_call+0x7/0xb
 > > 
 > > This oops occurs for every module, not just af_packet.ko, at
 > > resolve_symbol()'s first call to __find_symbol().
 > > 
 > > What happens is that __find_symbol() oopses because the kernel's
 > > symbol table is in la-la land. (Note the bogus kernel adress
 > > 2220c021 it tried to dereference above.)
 > > 
 > > Reverting 2.5.59's patch to arch/i386/vmlinux.lds.S cured the
 > > problem and modules now load correctly for me.
 > > 
 > > I don't know if this is a problem also for non-i386 archs.
 > > 
 > > /Mikael
 > 
 > What version of ld are you using?

2.13.90.0.2, as included in RH8.0.

/Mikael
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