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From: ebiederm@xmission.com (Eric W. Biederman)
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Whitcroft <apw@shadowen.org>, linux-kernel@vger.kernel.org,
       nfs@lists.sourceforge.net, kamalesh@linux.vnet.ibm.com,
       Alexey Dobriyan <adobriyan@gmail.com>
Subject: Re: mm snapshot broken-out-2007-11-20-01-45.tar.gz -- powerpc panic
References: <200711200953.lAK9qxjO030444@imap1.linux-foundation.org>
	<20071120144659.GC12066@shadowen.org>
	<20071120123559.d970db9e.akpm@linux-foundation.org>
Date: Tue, 20 Nov 2007 15:23:07 -0700
In-Reply-To: <20071120123559.d970db9e.akpm@linux-foundation.org> (Andrew
	Morton's message of "Tue, 20 Nov 2007 12:35:59 -0800")
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Andrew Morton <akpm@linux-foundation.org> writes:

> On Tue, 20 Nov 2007 14:46:59 +0000
> Andy Whitcroft <apw@shadowen.org> wrote:
>
>> I have one powerpc machine which managed to compile this snapshot!  It
>> paniced on boot as below, might be nfs so copied them.  General results
>> are popping out on TKO.
>> 
>> -apw
>> 
>> Freeing initrd memory: 1224k freed
>> Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
>> Unable to handle kernel paging request for data at address 0x00000050
>> Faulting instruction address: 0xc000000000113b64
>> Oops: Kernel access of bad area, sig: 11 [#1]
>> SMP NR_CPUS=32 NUMA pSeries
>> Modules linked in:
>> NIP: c000000000113b64 LR: c000000000113b44 CTR: 0000000000000000
>> REGS: C00000077E0679D0 TRAP: 0300   Not tainted  (2.6.24-rc3-mm1-autokern1)
>> MSR: 8000000000009032 <EE,ME,IR,DR>  CR: 24004044  XER: 20000000
>> DAR: 0000000000000050, DSISR: 0000000040000000
>> TASK = C00000077E062000[1] 'swapper' THREAD: C00000077E064000 CPU: 0
>> GPR00: 0000000000000000 c00000077e067c50 c0000000006c5650 0000000000000001 
>> GPR04: c00000077e625bdc 0000000000000005 c000000000501ad4 c000000000731d18 
>> GPR08: 0000000000000000 0000000000000000 c00000077e625b40 0000000000000001 
>> GPR12: 0000000024004044 c0000000005fd000 0000000000000000 0000000000000000 
>> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 
>> GPR20: 4000000003a00000 0000000004300000 0000000003fb94a8 0000000000132000 
>> GPR24: 0000000003fb9718 0000000000000000 c0000000005b6e70 0000000000000000 
>> GPR28: 0000000000000005 c00000077e625b40 c000000000652e48 c00000077e625c50 
>> NIP [c000000000113b64] .remove_proc_entry+0xac/0x234
>> LR [c000000000113b44] .remove_proc_entry+0x8c/0x234
>> Call Trace:
>> [c00000077e067c50] [c000000000113b44] .remove_proc_entry+0x8c/0x234
> (unreliable)
>> [c00000077e067d10] [c00000000048bf28] .cache_unregister+0x108/0x1b4
>> [c00000077e067d90] [c0000000001ca988] .nfsd_export_shutdown+0x50/0xa4
>> [c00000077e067e10] [c0000000005a712c] .init_nfsd+0x108/0x13c
>> [c00000077e067ea0] [c000000000582438] .kernel_init+0x224/0x3fc
>> [c00000077e067f90] [c000000000026204] .kernel_thread+0x4c/0x68
>> Instruction dump:
>> e8bf0000 e8810090 7f83e378 4bfffd25 2f830000 419e0018 ebbf0000 e81d0050 
>> f81f0000 38000000 f81d0050 e93f0000 <e8090050> 3be90050 2fa00000 409effc4 
>> Kernel panic - not syncing: Attempted to kill init!
>
> Various people have been mucking with procfs core:
>
> proc-remove-module_license.patch
> proc-less-lock-operations-during-lookup.patch
> proc-simplify-function-prototypes.patch
> proc-remove-useless-check-on-symlink-removal.patch
> proc-remove-useless-checks-in-proc_register.patch
> proc-detect-duplicate-names-on-registration.patch
> proc-detect-duplicate-names-on-registration-fix.patch
> proc-simplify-remove_proc_entry-wrt-locking.patch
> proc-simplify-remove_proc_entry-wrt-locking-checkpatch-fixes.patch

> proc-implement-proc_single_file_operations.patch
> proc-rewrite-do_task_stat-to-correctly-handle-pid-namespaces.patch
> proc-seqfile-convert-proc_pid_statm.patch
> proc-proper-pidns-handling-for-proc-self.patch

These last four are all affect proc/base not proc/generic so they should
have no affect on this issue.  Those two are almost entirely separate
filesystems.

> And I had to skip a couple of patches due to conflicts.
>
> I'll see if it happens on any of my test machines.

If I get a bit more I will look more closely.  I'm right on
the edge of figuring out how to really slicing /proc into multiple filesystems
at the moment.

Eric


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