http://bugzilla.kernel.org/show_bug.cgi?id=8346
------- Additional Comments From [EMAIL PROTECTED] 2007-04-20 07:16 -------
This bug is a bit frustrating :-)
I spent another day on trying to hunt down exactly what is happening,
with moderate success. Here's what I could establish for a fact
- the bug is triggered by the call to
acpi_os_write_port(acpi_gbl_FADT.smi_command,
acpi_gbl_FADT.cst_control, 8);
If I make it skip this outb, everything works like a charm
- The symptoms look like some strange memory corruption to me, but
without a fixed pattern. However, many of the oopses I recorded
had a mismatch between %esp (which belonged to modprobe) and
struct current (which pointed at some other task, probably whatever
was currently active on the other CPU).
I actually added a check to the oops code which would chase
current_thread_info()->task, and it would always show the modprobe
task in state TASK_RUNNING.
- In the oops handler, I compared smp_processor_id() to
safe_smp_processor_id(), which I *think* should trigger if we're
running with %fs pointing to the wrong kernel PDA. But this condition
never triggered.
- I added a printk to acpi_ev_sci_xrupt_handler and a few exception
handlers to see if there was some bad interaction going on, but
that printk never triggered.
So I'm back to suspecting the ACPI BIOS doing something stupid - which would
be a pretty good assumption if it wasn't for the fact that the git bisect
showed that this particular problem seems to have been introduced by the
new ACPI table manager code.
Any other ideas to try?
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