stopping amd causes a freeze

[Dominic Fandrey]

On 22/07/2013 12:07, Konstantin Belousov wrote:
> On Mon, Jul 22, 2013 at 11:50:24AM +0200, Dominic Fandrey wrote:
>> Occasionally stopping amd freezes my system. It's a rare occurrence,
>> and I haven't found a reliable way to reproduce it.
>>
>> It's also a real freeze, so there's no way to get into the debugger
>> or grab a core dump. I only can perform the 4 seconds hard shutdown to
>> revive the system.
>>
>> I run amd through sysutils/automounter, which is a scripting solution
>> that generates an amd.map file based on encountered devices and devd
>> events. The SIGHUP it sends to amd to tell it the map file was updated
>> does not cause problems, only a SIGKILL may cause the freeze.
>>
>> Nothing was mounted (by amd) during the last freeze.
>>
>> I don't see any angle to tackle this, but I'm throwing it out here
>> any way, in the hopes that someone actually has an idea how to approach
>> the issue.
> 
> Are you sure that the machine did not paniced ?  Do you have serial console ?

No, I don't have one. All that I can tell is that everything freezes
(i.e. Xorg screen and mouse). ACPI events like shutdown don't cause a
reaction. And the system doesn't respond to ICMP queries.

> The amd(8) locks itself into memory, most likely due to the fear of
> deadlock. There are some known issues with user wirings in stable/9.
> If the problem you see is indeed due to wiring, you might try to apply
> r253187-r253191.

>From head? That may be worth a try. It would be better for testing if I
managed to reproduce the problem reliably, before I test patches.

I see it's scheduled for MFC, soon.

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