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Message-ID: <49E3990C.6040303@tuffmail.co.uk>
Date: Mon, 13 Apr 2009 20:57:00 +0100
From: Alan Jenkins <alan-jenkins@...fmail.co.uk>
To: Bjorn Helgaas <bjorn.helgaas@...com>
CC: linux-acpi@...r.kernel.org,
linux-kernel <linux-kernel@...r.kernel.org>,
Kernel Testers List <kernel-testers@...r.kernel.org>,
Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: Re: [BISECTED] EEE PC hangs when booting off battery
Bjorn Helgaas wrote:
> On Sunday 12 April 2009 07:11:57 am Alan Jenkins wrote:
>
> You mention that this occurs when booting off battery. So I
> assume everything works fine when the EEE is plugged in to the
> wall socket?
>
When I tested it before, that was what I found.
However, I now find that's not quite right. It only works (i.e. doesn't
hang) if I remove the battery as well as plugging it into the wall. If
I have the battery in, it hangs.
>>>>> Magic SysRQ keys work though. ...
>>>>>
>>> I was able to run SysRq-P, and found the following backtrace -
>>>
>>> Pid: 0
>>> EIP is at acpi_idle_enter_bm+0x1df/0x208 [processor]
>>>
>
> Can you figure out where this is in acpi_idle_enter_bm() or
> maybe just email me your processor.ko module?
>
> Does it always happen at the same point?
>
Yes, it always happens at the same point.
It turns out I can read the runes, but I don't understand what they're
saying :-).
objdump -dr processor.o
00001bd0 <acpi_idle_enter_bm>:
...
00001bd0 + 0x1df = 00001daf
...
1d70: b8 03 00 00 00 mov $0x3,%eax
1d75: e8 90 f3 ff ff call 110a <tsc_halts_in_c>
1d7a: 85 c0 test %eax,%eax
1d7c: 74 0a je 1d88 <acpi_idle_enter_bm+0x1b8>
1d7e: b8 0e 09 00 00 mov $0x90e,%eax
1d7f: R_386_32 .rodata.str1.1
1d83: e8 fc ff ff ff call 1d84 <acpi_idle_enter_bm+0x1b4>
1d84: R_386_PC32 mark_tsc_unstable
1d88: 8b 45 e8 mov -0x18(%ebp),%eax
1d8b: 8b 55 ec mov -0x14(%ebp),%edx
1d8e: e8 ab fd ff ff call 1b3e <us_to_pm_timer_ticks>
1d93: 89 c3 mov %eax,%ebx
1d95: b8 17 01 00 00 mov $0x117,%eax
1d9a: 69 ca 17 01 00 00 imul $0x117,%edx,%ecx
1da0: 89 d6 mov %edx,%esi
1da2: f7 e3 mul %ebx
1da4: 8d 14 11 lea (%ecx,%edx,1),%edx
1da7: e8 fc ff ff ff call 1da8 <acpi_idle_enter_bm+0x1d8>
1da8: R_386_PC32 sched_clock_idle_wakeup_event
1dac: fb sti
1dad: 89 e0 mov %esp,%eax
-> 1daf: 31 c9 xor %ecx,%ecx <---------
1db1: 25 00 e0 ff ff and $0xffffe000,%eax
1db6: 89 fa mov %edi,%edx
1db8: 83 48 0c 04 orl $0x4,0xc(%eax)
1dbc: ff 47 18 incl 0x18(%edi)
1dbf: 8b 45 e4 mov -0x1c(%ebp),%eax
1dc2: e8 a4 f5 ff ff call 136b <acpi_state_timer_broadcast>
1dc7: 01 5f 1c add %ebx,0x1c(%edi)
1dca: 11 77 20 adc %esi,0x20(%edi)
1dcd: 8b 45 e8 mov -0x18(%ebp),%eax
1dd0: 83 c4 10 add $0x10,%esp
1dd3: 5b pop %ebx
1dd4: 5e pop %esi
1dd5: 5f pop %edi
1dd6: 5d pop %ebp
1dd7: c3 ret
> If you blacklist or rename the processor module to prevent it
> from loading, does that keep the hang from occurring?
>
No. In that case I get the hang in default_idle+0x59/0x95
0000007a <default_idle>:
7a: 55 push %ebp
7b: 89 e5 mov %esp,%ebp
7d: 56 push %esi
7e: 53 push %ebx
7f: 83 ec 18 sub $0x18,%esp
82: 83 3d 18 00 00 00 00 cmpl $0x0,0x18
84: R_386_32 .bss
89: 75 7a jne 105 <default_idle+0x8b>
8b: 80 3d 05 00 00 00 00 cmpb $0x0,0x5
8d: R_386_32 boot_cpu_data
92: 74 71 je 105 <default_idle+0x8b>
94: 83 3d 04 00 00 00 00 cmpl $0x0,0x4
96: R_386_32 __tracepoint_power_start
9b: 74 23 je c0 <default_idle+0x46>
9d: 8b 1d 08 00 00 00 mov 0x8,%ebx
9f: R_386_32 __tracepoint_power_start
a3: 85 db test %ebx,%ebx
a5: 74 19 je c0 <default_idle+0x46>
a7: 8d 75 e0 lea -0x20(%ebp),%esi
aa: b9 01 00 00 00 mov $0x1,%ecx
af: ba 01 00 00 00 mov $0x1,%edx
b4: 89 f0 mov %esi,%eax
b6: ff 13 call *(%ebx)
b8: 83 c3 04 add $0x4,%ebx
bb: 83 3b 00 cmpl $0x0,(%ebx)
be: 75 ea jne aa <default_idle+0x30>
c0: 89 e0 mov %esp,%eax
c2: 25 00 e0 ff ff and $0xffffe000,%eax
c7: 83 60 0c fb andl $0xfffffffb,0xc(%eax)
cb: f6 40 08 08 testb $0x8,0x8(%eax)
cf: 75 04 jne d5 <default_idle+0x5b>
d1: fb sti
d2: f4 hlt
--> d3: eb 01 jmp d6 <default_idle+0x5c> <--------
d5: fb sti
d6: 89 e0 mov %esp,%eax
d8: 25 00 e0 ff ff and $0xffffe000,%eax
dd: 83 48 0c 04 orl $0x4,0xc(%eax)
e1: 83 3d 04 00 00 00 00 cmpl $0x0,0x4
e3: R_386_32 __tracepoint_power_end
e8: 74 1e je 108 <default_idle+0x8e>
>> 7ec0a7290797f57b780f792d12f4bcc19c83aa4f is first bad commit
>> commit 7ec0a7290797f57b780f792d12f4bcc19c83aa4f
>> Author: Bjorn Helgaas <bjorn.helgaas@...com>
>> Date: Mon Mar 30 17:48:24 2009 +0000
>>
>
> Ouch, sorry about that. Thanks for doing all the bisection work.
>
>
>> ACPI: processor: use .notify method instead of installing handler
>> directly
>>
>> This patch adds a .notify() method. The presence of .notify() causes
>> Linux/ACPI to manage event handlers and notify handlers on our behalf,
>> so we don't have to install and remove them ourselves.
>>
>> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>
>> CC: Zhang Rui <rui.zhang@...el.com>
>> CC: Zhao Yakui <yakui.zhao@...el.com>
>> CC: Venki Pallipadi <venkatesh.pallipadi@...el.com>
>> CC: Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>
>> Signed-off-by: Len Brown <len.brown@...el.com>
>>
>> However, reverting this commit from v2.6.30-rc1 doesn't solve the hang.
>>
>
> I don't see the problem in that commit yet, and if there is a problem
> with it, I would think that reverting it from 2.6.30-rc1 would solve
> it. But maybe it'd be useful to revert the whole .notify series to
> make sure. From 2.6.30-rc1, you should be able to revert these:
>
> 7ec0a7290797f57b780f792d12f4bcc19c83aa4f processor
> 373cfc360ec773be2f7615e59a19f3313255db7c button
> 46ec8598fde74ba59703575c22a6fb0b6b151bb6 Linux/ACPI infrastructure
>
> What happens with those commits reverted?
>
I'll find out tomorrow.
Thanks
Alan
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