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SubjectRe: 2.6.19-rc5-mm2
On Tue, Nov 14, 2006 at 10:31:40PM +1100, Reuben Farrelly wrote:

Hi Reuben,

> Oops:
>
> (davej cc'd - I think it's his specialty)
>

[snip]

> ------------[ cut here ]------------
> kernel BUG at drivers/cpufreq/cpufreq_userspace.c:138!
> invalid opcode: 0000 [1] SMP
> last sysfs file:
> CPU 0
> Modules linked in:
> Pid: 1, comm: swapper Not tainted 2.6.19-rc5-mm2 #1
> RIP: 0010:[<ffffffff80435299>] [<ffffffff80435299>]
> cpufreq_governor_userspace+0x4e/0x1aa
> RSP: 0000:ffff81003f61fb40 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffff81003ef4a0d8 RCX: 0000000000000003
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff81003ef4a0d8
> RBP: ffff81003f61fb60 R08: 0000000000000002 R09: 0000000000000001
> R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000000
> R13: 00000000ffffffea R14: 0000000000000000 R15: 0000000000000000
> FS: 0000000000000000(0000) GS:ffffffff80652000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
> Process swapper (pid: 1, threadinfo ffff81003f61e000, task ffff810037ff0040)
> Stack: ffff81003f61fb60 ffff81003ef4a0d8 0000000000000001 ffff81003ef4a0d8
> ffff81003f61fb90 ffffffff80433b11 ffffffff805d0e80 ffff81003f61fc20
> 0000000000000000 ffff81003ef4a0d8 ffff81003f61fbc0 ffffffff80434278
> Call Trace:
> [<ffffffff80433b11>] __cpufreq_governor+0x51/0x9b
> [<ffffffff80434278>] __cpufreq_set_policy+0xf8/0x13b
> [<ffffffff804343e9>] cpufreq_set_policy+0x3c/0x93
> [<ffffffff80435125>] cpufreq_add_dev+0x315/0x427
> [<ffffffff803b6f87>] sysdev_driver_register+0x87/0xdb
> [<ffffffff80434a8e>] cpufreq_register_driver+0x9e/0x120
> [<ffffffff806837b2>] acpi_cpufreq_init+0xbe/0xc9
> [<ffffffff802666c0>] init+0x160/0x31c
> [<ffffffff8025deb8>] child_rip+0xa/0x12
>
>

Hmmm.. The BUG indicates policy->cur i.e current frequency is 0.

In this scenario, policy->cur variable was last set inside
acpi_cpufreq_cpu_init when cpufreq_add_dev made a call to
cpufreq_driver->init(policy).

Are you able to reproduce this with 2.6.19-rc5-mm1?

Because AFAICS, there ain't many changes w.r.t x86_64 acpi-cpufreq
from 2.6.19-rc5-mm1 to 2.6.19-rc5-mm2.

>
> I've put the full config up at
> http://www.reub.net/files/kernel/configs/2.6.19-rc5-mm1-brokencpufreq

I hope the name 2.6.19-rc5-'mm1'-brokencpufreq is by mistake :-)

> Disable cpufreq in the config and the kernel otherwise boots and works fine.
>
> Reuben

regards,
gautham.
--
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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