[haiku-bugs] Re: [Haiku] #9858: Ripping CDs -> page fault panic
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Mon, 22 Jul 2013 22:10:26 -0000
#9858: Ripping CDs -> page fault panic
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Reporter: ttcoder | Owner: nobody
Type: bug | Status: assigned
Priority: high | Milestone: R1/beta1
Component: System/Kernel | Version: R1/Development
Resolution: | Keywords: slab
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by bonefish):
I assume you didn't actually try to disable SMP (in the boot loader or via
kernel settings)? The disable CPU feature just tells the scheduler not to
schedule any threads but the idle thread on that CPU. Interrupts can still
be processed on it. So it's not like disabling all but one CPU actually
disables SMP.
Moreover it is entirely possible (maybe even likely) that CD ripping
doesn't actually trigger the bug, but just makes it visible. Reading the
whole CD simply causes a large cache turnover (essentially the whole CD is
read into RAM). So if some paging related structures got corrupted or a
page was erroneously marked free before, using a lot of pages makes it
rather likely to run into the issue. So even if SMP could actually be
disabled live, running into the problem after doing that doesn't
necessarily mean that isn't purely SMP related.
Long story short, it would be nice if you could test with SMP disabled.
--
Ticket URL: <http://dev.haiku-os.org/ticket/9858#comment:11>
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