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    SubjectRe: [BUG] 2.6.25-rc5-mm1 kernel panic with "Exception: 501 " on powerpc
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    On Wed, 2008-03-12 at 18:25 +0530, Kamalesh Babulal wrote:
    > 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

    Is this only on one machine ? happens all the time ?

    I ran into similar issues on rc3-mm1. rc5-mm1 seems to be working fine
    for me on ppc64.

    Thanks,
    Badari



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