[haiku-bugs] Re: [Haiku] #7904: Kernel panics popping up in latest nightlies
- From: "anevilyak" <trac@xxxxxxxxxxxx>
- Date: Thu, 08 Nov 2012 02:18:20 -0000
#7904: Kernel panics popping up in latest nightlies
-----------------------------+----------------------------
Reporter: ddavid123 | Owner: axeld
Type: bug | Status: new
Priority: high | Milestone: R1
Component: System/Kernel | Version: R1/Development
Resolution: | Keywords: vm virtualbox
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by anevilyak):
We're actually observing this issue 100% reproducibly on boot with the ARM
port on qemu. In the latter's case it occurs while tearing down the area
for the USB PMA (since USB fails to initialize due to not finding the PCI
bus manager). In our case, what appears to happen is that the page in
question does not in fact have any mappings, but does have a wired count
of 1. We initially assumed that this might pertain to incomplete reporting
of the accessed/modified flags in ARMVMTranslationMap32Bit since the
ARMv5/v6 cores we're currently working with don't support those bits in
hardware and we'll have to do sw emulation of them, but if this is a
previously known problem then it's possible we're simply reliably
triggering whatever the corner case is in the VM.
--
Ticket URL: <http://dev.haiku-os.org/ticket/7904#comment:9>
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