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Date: Wed, 4 Oct 2006 08:45:40 -0700
From: Andrew Morton <akpm@osdl.org>
To: Steve Fox <drfickle@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
       Andi Kleen <ak@suse.de>, Vivek Goyal <vgoyal@in.ibm.com>
Subject: Re: 2.6.18-mm2 boot failure on x86-64
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On Wed, 04 Oct 2006 08:42:28 -0500
Steve Fox <drfickle@us.ibm.com> wrote:

> On Thu, 2006-09-28 at 14:01 -0700, Andrew Morton wrote:
> > On Thu, 28 Sep 2006 17:50:31 +0000 (UTC)
> > "Steve Fox" <drfickle@us.ibm.com> wrote:
> > 
> > > On Thu, 28 Sep 2006 01:46:23 -0700, Andrew Morton wrote:
> > > 
> > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18/2.6.18-mm2/
> > > 
> > > Panic on boot. This machine booted 2.6.18-mm1 fine. em64t machine.
> > > 
> > > TCP bic registered
> > > TCP westwood registered
> > > TCP htcp registered
> > > NET: Registered protocol family 1
> > > NET: Registered protocol family 17
> > > Unable to handle kernel paging request at ffffffffffffffff RIP: 
> > >  [<ffffffff8047ef93>] packet_notifier+0x163/0x1a0
> > > PGD 203027 PUD 2b031067 PMD 0 
> > > Oops: 0000 [1] SMP 
> > > last sysfs file: 
> > > CPU 0 
> > > Modules linked in:
> > > Pid: 1, comm: swapper Not tainted 2.6.18-mm2-autokern1 #1
> > > RIP: 0010:[<ffffffff8047ef93>]  [<ffffffff8047ef93>] packet_notifier+0x163/0x1a0
> > > RSP: 0000:ffff810bffcbde90  EFLAGS: 00010286
> > > RAX: 0000000000000000 RBX: ffff810bff4a1000 RCX: 2222222222222222
> > > RDX: ffff810bff4a1000 RSI: 0000000000000005 RDI: ffffffff8055f5e0
> > > RBP: ffffffffffffffff R08: 0000000000007616 R09: 000000000000000e
> > > R10: 0000000000000006 R11: ffffffff803373f0 R12: 0000000000000000
> > > R13: 0000000000000005 R14: ffff810bff4a1000 R15: 0000000000000000
> > > FS:  0000000000000000(0000) GS:ffffffff805d8000(0000) knlGS:0000000000000000
> > > CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> > > CR2: ffffffffffffffff CR3: 0000000000201000 CR4: 00000000000006e0
> > > Process swapper (pid: 1, threadinfo ffff810bffcbc000, task ffff810bffcbb510)
> > > Stack:  ffff810bff4a1000 ffffffff8055f4c0 0000000000000000 ffff810bffcbdef0
> > >  0000000000000000 ffffffff8042736e 0000000000000000 0000000000000000
> > >  0000000000000000 ffffffff8061c68d ffffffff806260f0 ffffffff80207182
> > > Call Trace:
> > >  [<ffffffff8042736e>] register_netdevice_notifier+0x3e/0x70
> > >  [<ffffffff8061c68d>] packet_init+0x2d/0x53
> > >  [<ffffffff80207182>] init+0x162/0x330
> > >  [<ffffffff8020a9d8>] child_rip+0xa/0x12
> > >  [<ffffffff8033c2a2>] acpi_ds_init_one_object+0x0/0x82
> > >  [<ffffffff80207020>] init+0x0/0x330
> > >  [<ffffffff8020a9ce>] child_rip+0x0/0x12
> > > 
> > > 
> > > Code: 48 8b 45 00 0f 18 08 49 83 fd 02 4c 8d 65 f8 0f 84 f8 fe ff 
> > > RIP  [<ffffffff8047ef93>] packet_notifier+0x163/0x1a0
> > >  RSP <ffff810bffcbde90>
> > > CR2: ffffffffffffffff
> > >  <0>Kernel panic - not syncing: Attempted to kill init!
> > > 
> > 
> > I'm really struggling to work out what went wrong there.  Comparing your
> > miserable 20 bytes of code to my object code makes me think that this:
> > 
> > 		struct packet_sock *po = pkt_sk(sk);
> > 
> > returned -1, perhaps in %ebp.  But it's all very crude.
> > 
> > Perhaps you could compile that kernel with CONFIG_DEBUG_INFO, rerun it (the
> > addresses might change) then have a poke around with `gdb vmlinux' (or
> > maybe just addr2line) to work out where it's really oopsing?
> > 
> > I don't see much which has changed in that area recently.
> 
> Sorry for the delay. I was finally able to perform a bisect on this. It
> turns out the patch that causes this is
> x86_64-mm-re-positioning-the-bss-segment.patch, which seems like a
> strange candidate, but sure enough I can boot to login: right up until
> that patch is applied.

hm, that patch was merged into mainline September 29.  Does mainline work?

> P.S. I had to comment usb-hubc-build-fix.patch out of the series file
> because it would not apply cleanly and caused quilt (0.45) to simply
> abort its 'push' operation.

Sorry about that.

If mainline _does_ work then perhaps it's an interaction between that patch
and something else in the -mm2 lineup (and at that point in the bisection,
it'll be one of the git trees or something else in the x86_64 tree).  Could
be that the problem remains in -mm3.
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