boot hang with certain Phenom II cpu models

Andriy Gapon avg at
Sat Dec 15 12:40:01 UTC 2018

On 14/12/2018 21:37, Sascha Klauder wrote:
> On Fri, 2018-12-14 11:56 +0200, Andriy Gapon wrote:
>> On 13/12/2018 12:56, Sascha Klauder wrote:
>>> So far, I tried (unsuccessfully) to disable obvious ACPI sub-
>>> systems (cpu, mwait, quirks) and debug settings (acpi.cpu_unordered,
>>> acpi.max_threads).  Anyone got a hint where to look or debug this
>>> further?
>> Are you able to identify if you have a hardware or a software hang?
>> E.g., are you able to enter ddb?
>  Hardware; can't enter ddb and can't toggle caps lock.  I could
> probably setup remote GDB (serial) but would need some pointer
> how to proceed from there.

The only idea I have is to boot to ddb (boot_ddb="YES" or boot -d), set a
breakpoint in a function from which the last printed line comes[*], continue
until the breakpoint is hit and then step from there trying to narrow down a
function (or even an instruction) where the hang happens.

[*] - seems to be pcie_cfgregopen()

Andriy Gapon

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