Public bug reported: 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 ** Affects: qemu Importance: Undecided Status: New -- Unaccessible memory https://bugs.launchpad.net/bugs/682360 You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. Status in QEMU: New 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
