Andrew Morton wrote:
> On Wed, 02 Apr 2008 11:55:36 +0530 Kamalesh Babulal <[EMAIL PROTECTED]> wrote:
>
>> Hi Andrew,
>>
>> The 2.6.25-rc8-mm1 kernel panic's while bootup on the power machine(s).
>>
>> [ 0.000000] ------------[ cut here ]------------
>> [ 0.000000] kernel BUG at arch/powerpc/mm/init_64.c:240!
>> [ 0.000000] Oops: Exception in kernel mode, sig: 5 [#1]
>> [ 0.000000] SMP NR_CPUS=32 NUMA PowerMac
>> [ 0.000000] Modules linked in:
>> [ 0.000000] NIP: c0000000003d1dcc LR: c0000000003d1dc4 CTR:
>> c00000000002b6ac
>> [ 0.000000] REGS: c00000000049b960 TRAP: 0700 Not tainted
>> (2.6.25-rc8-mm1-autokern1)
>> [ 0.000000] MSR: 9000000000021032 <ME,IR,DR> CR: 44000088 XER: 20000000
>> [ 0.000000] TASK = c0000000003f9c90[0] 'swapper' THREAD: c000000000498000
>> CPU: 0
>> [ 0.000000] GPR00: c0000000003d1dc4 c00000000049bbe0 c0000000004989d0
>> 0000000000000001
>> [ 0.000000] GPR04: d59aca40f0000000 000000000b000000 0000000000000010
>> 0000000000000000
>> [ 0.000000] GPR08: 0000000000000004 0000000000000001 c00000027e520800
>> c0000000004bf0f0
>> [ 0.000000] GPR12: c0000000004bf020 c0000000003fa900 0000000000000000
>> 0000000000000000
>> [ 0.000000] GPR16: 0000000000000000 0000000000000000 0000000000000000
>> 0000000000000000
>> [ 0.000000] GPR20: 0000000000000000 0000000000000000 0000000000000000
>> 4000000001400000
>> [ 0.000000] GPR24: 00000000017d64b0 c0000000003d6250 0000000000000000
>> c000000000504000
>> [ 0.000000] GPR28: 0000000000000000 cf000000001f8000 0000000001000000
>> cf00000000000000
>> [ 0.000000] NIP [c0000000003d1dcc] .vmemmap_populate+0xb8/0xf4
>> [ 0.000000] LR [c0000000003d1dc4] .vmemmap_populate+0xb0/0xf4
>> [ 0.000000] Call Trace:
>> [ 0.000000] [c00000000049bbe0] [c0000000003d1dc4]
>> .vmemmap_populate+0xb0/0xf4 (unreliable)
>> [ 0.000000] [c00000000049bc70] [c0000000003d2ee8]
>> .sparse_mem_map_populate+0x38/0x60
>> [ 0.000000] [c00000000049bd00] [c0000000003c242c]
>> .sparse_early_mem_map_alloc+0x54/0x94
>> [ 0.000000] [c00000000049bd90] [c0000000003c250c] .sparse_init+0xa0/0x20c
>> [ 0.000000] [c00000000049be50] [c0000000003ab7d0] .setup_arch+0x1ac/0x218
>> [ 0.000000] [c00000000049bee0] [c0000000003a36ac] .start_kernel+0xe0/0x3fc
>> [ 0.000000] [c00000000049bf90] [c000000000008594]
>> .start_here_common+0x54/0xc0
>> [ 0.000000] Instruction dump:
>> [ 0.000000] 7fe3fb78 7ca02a14 4082000c 3860fff4 4800003c e92289c8
>> e96289c0 e9090002
>> [ 0.000000] e8eb0002 4bc575cd 60000000 78630fe0 <0b030000> 7ffff214
>> 7fbfe840 7fe3fb78
>> [ 0.000000] ---[ end trace 31fd0ba7d8756001 ]---
>> [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
>>
>
> int __meminit vmemmap_populate(struct page *start_page,
> unsigned long nr_pages, int node)
> {
> unsigned long mode_rw;
> unsigned long start = (unsigned long)start_page;
> unsigned long end = (unsigned long)(start_page + nr_pages);
> unsigned long page_size = 1 << mmu_psize_defs[mmu_linear_psize].shift;
>
> mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
>
> /* Align to the page size of the linear mapping. */
> start = _ALIGN_DOWN(start, page_size);
>
> for (; start < end; start += page_size) {
> int mapped;
> void *p;
>
> if (vmemmap_populated(start, page_size))
> continue;
>
> p = vmemmap_alloc_block(page_size, node);
> if (!p)
> return -ENOMEM;
>
> pr_debug("vmemmap %08lx allocated at %p, physical %08lx.\n",
> start, p, __pa(p));
>
> mapped = htab_bolt_mapping(start, start + page_size,
> __pa(p), mode_rw, mmu_linear_psize,
> mmu_kernel_ssize);
> =====> BUG_ON(mapped < 0);
> }
>
> return 0;
> }
>
> Beats me. pseries? Badari has been diddling with the bolted memory code
> in git-powerpc...
One of the machines is the Power5 and another is PowerMac G5, on which the
same kernel panic is seen.
--
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.
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