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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/deepseek-r1:14b/output/hypervisor/682360
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloadqemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
qemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
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+
+Unaccessible memory
+
+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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