RE: [discuss] [OOPS] powernow on smp dual core amd64

Tom Duffy
2005-06-13T22:26:00Z

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On Mon, 2005-06-13 at 16:47 -0500, Langsdorf, Mark wrote:
> Okay, I think I have figured this out. During initialization,
> the cpufreq infrastruture only initializes the first core of
> each processor. When a request comes into the second core,
> it's data structre is unitialized and we get the null point
> dereference.
>
> The solution is to assign the pointer to the data structure for
> the first core to all the other cores.
>
> Tom, could you try this patch and see if it helps?

Yes! It fixed the panic. I get much further.

Thanks!

Unfortunately, after starting cpuspeed daemon, I get this:

Starting cpuspeed: [ OK ]
Starting pcmcia: Starting PCMCIA services:
CPU 6: Machine Check Exception: 4 Bank 4: b200000000070f0f
TSC 4129a3d70d
Kernel panic - not syncing: Machine check
<1>Unable to handle kernel NULL pointer dereference at 00000000000000ff RIP:
[<00000000000000ff>]
PGD 41460067 PUD 3f12c067 PMD 0
Oops: 0010 [1] SMP
CPU 6
Modules linked in: video container button battery ac ohci_hcd ehci_hcd i2c_nforce2 i2c_core shpchp usbnet mii dm_snapshot dm_zero dm_mirror ext3 jbd dm_mod sata_nv libata mptscsih mptbase sd_mod scsi_mod
Pid: 1672, comm: usb.agent Tainted: G M 2.6.12-rc6andro
RIP: 0010:[<00000000000000ff>] [<00000000000000ff>]
RSP: 0000:ffff81003fe63fa0 EFLAGS: 00010006
RAX: ffff81007f5b1fd8 RBX: 0000000000000008 RCX: 0000ffff0000ffff
RDX: 00000000000000ff RSI: 0000000000000008 RDI: 0000ffff0000ffff
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000004129a3cf88 R14: ffffffff80370a7d R15: 0000000000000001
FS: 00002aaaaaae0ee0(0000) GS:ffffffff80498400(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00000000000000ff CR3: 000000003e7e5000 CR4: 00000000000006e0
Process usb.agent (pid: 1672, threadinfo ffff81007f5b0000, task ffff81007fddcff0)
Stack: ffffffff8011ac99 ffffffff80370a7d ffffffff8010f247 ffff81007fea2c88 <EOI>
0000000000000005 0000000000000030 00000000000000fa 0000000000000000
ffffffff8011a860 0000000000000000
Call Trace: <IRQ> <ffffffff8011ac99>{smp_call_function_interrupt+73}
<ffffffff8010f247>{call_function_interrupt+99} <EOI> <#MC> <ffffffff8011a860>{smp_really_stop_cpu+0}
<ffffffff8011aa68>{smp_send_stop+72} <ffffffff80136ebc>{panic+140}
<ffffffff80115ce8>{print_mce+136} <ffffffff80115db9>{mce_panic+137}
<ffffffff8011643f>{do_machine_check+767} <ffffffff8010facb>{machine_check+127}
<ffffffff8010f24c>{apic_timer_interrupt+0} <EOE> <ffffffff801224dc>{do_page_fault+1196}
<ffffffff801224d9>{do_page_fault+1193} <ffffffff8018c14e>{sys_newstat+46} <ffffffff8010f401>{error_exit+0}

Code: Bad RIP value.
RIP [<00000000000000ff>] RSP <ffff81003fe63fa0>
CR2: 00000000000000ff
<0>Kernel panic - not syncing: Oops

The machine resets itself after this.

-tduffy

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