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Date: Wed, 12 Mar 2008 18:25:37 +0530
From: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
MIME-Version: 1.0
To: Andrew Morton <akpm@linux-foundation.org>
Subject: [BUG] 2.6.25-rc5-mm1 kernel panic with "Exception: 501 " on powerpc
References: <20080311011434.ad8c8d7d.akpm@linux-foundation.org>
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Hi Andrew,

The 2.6.25-rc5-mm1 kernel panics while bootup on powerpc

returning from prom_init
Unable to handle kernel paging request for data at address 0x00000000
Faulting instruction address: 0xc00000000000d5dc
cpu 0x0: Vector: 300 (Data Access) at [c0000000007636e0]
    pc: c00000000000d5dc: .do_IRQ+0x74/0x1f4
    lr: c00000000000d5a8: .do_IRQ+0x40/0x1f4
    sp: c000000000763960
   msr: 8000000000001032
   dar: 0
 dsisr: 40000000
  current = 0xc000000000688e60
  paca    = 0xc000000000689900
    pid   = 0, comm = swapper
enter ? for help
[c000000000763a00] c000000000004c24 hardware_interrupt_entry+0x24/0x28
--- Exception: 501 (Hardware Interrupt) at c0000000006021b0 .free_bootmem_core+0x94/0xcc
[link register   ] c00000000060373c .free_bootmem_with_active_regions+0x78/0xb8
[c000000000763cf0] c000000000602610 .init_bootmem_core+0x5c/0xfc (unreliable)
[c000000000763d80] c0000000005eb68c .do_init_bootmem+0x964/0xaf0
[c000000000763e50] c0000000005e03b0 .setup_arch+0x1a4/0x218
[c000000000763ee0] c0000000005d76bc .start_kernel+0xe8/0x424
[c000000000763f90] c000000000008590 .start_here_common+0x60/0xd0

-- 
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.