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[Qemu-devel] [Bug 682360] Re: Unaccessible memory
From: |
Launchpad Bug Tracker |
Subject: |
[Qemu-devel] [Bug 682360] Re: Unaccessible memory |
Date: |
Sat, 18 Feb 2017 04:17:28 -0000 |
[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/682360
Title:
Unaccessible memory
Status in QEMU:
Expired
Bug description:
Hello,
I'm trying to develop a OS over L4/X2 microkernel and I use Linux
debian and qemu 0.13 in 64 bits mode. When I start qemu with qemu-
system-x86_64 -hdc freevms.img -smp 1 -serial stdio -m 128M -k fr, my
kernel boots fine. If I modify this command line with -m 384M (for
example), my kernel is loaded but enter in a deadlock. I have found a
bug in my code until I have tried to use the _same_ disk image under
virtualbox and it works without any trouble. I runs fine on a real PC
also.
I have bissected my code and qemu stops (maybe in a deadlock) when I try to
access to memory :
%MEM-I-VM_ALLOC, adding $0000000000045000 - $0000000000108FFF to VM allocator
%MEM-I-VM_ALLOC, adding $000000000010B000 - $00000000003F2FFF to VM allocator
%MEM-I-VM_ALLOC, adding $000000000040C000 - $0000000000FFFFFF to VM allocator
%MEM-I-VM_ALLOC, adding $000000000100F000 - $FFFFFEFFFFFFFFFF to VM allocator
%MEM-I-ACCMAP, accepting mapping
%MEM-I-ACCMAP, virtual $FFFF000000000000 - $FFFF000000000FFF
%MEM-I-ACCMAP, physical $000000000009E000 - $000000000009EFFF
Note that qemu doesn't crash. It only stops. My virtual memory
subsystem maps $FFFF000000000000 in physical memory ($9E000). And when
I try to initialize this memory, qemu enters in deadlock.
A disk image to reproduce this bug is available at
http://www.systella.fr/~bertrand/freevms.img.bz2
Regards,
JKB
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