What's happening here is that the memory range you're asking to dump (physaddrs 0 to 0x3fffffff) includes a lot of devices, including the interrupt controller, which is at 0x1e000000. There's a longstanding bug in the GIC code where it will crash if you try to access its per-CPU register bank from some context that isn't a guest CPU (including the monitor or the QEMU gdb stub), because it doesn't know which CPU's version of the registers you wanted. That's what you've run into here.
However, I suspect you didn't really want to try to take a memory dump of a pile of devices. The RAM in the vexpress-a9 board starts at 0x60000000, so if you wanted the RAM then try pmemsave 0x60000000 0x9fffffff memory.dmp -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1751674 Title: qemu-system-arm segmentation fault trying to dump VM memory Status in QEMU: New Bug description: Qemu segfaults trying to generate a VM memory dump: $ QEMU_AUDIO_DRV=none qemu-git-src/arm-softmmu/qemu-system-arm -M vexpress-a9 -smp 4 -m 1024 -machine secure=off,dump-guest-core=on -kernel linux-4.9.75/arch/arm/boot/zImage -append "root=/dev/mmcblk0 rw rootfstype=ext4 mem=1024M net.ifnames=0 console=ttyAMA0" -dtb vexpress-v2p-ca9.dtb -sd armv7-hd.qcow2 -netdev tap,ifname=tap_armv7,script=no,downscript=no,id=net0 -device virtio-net-device,mac=00:AA:AD:BB:FF:02,netdev=net0 -monitor stdio -serial vc -loadvm SS0 QEMU 2.11.50 monitor - type 'help' for more information (qemu) pmemsave 0 0x3FFFFFFF memory.dmp Segmentation fault (core dumped) $ git rev-parse HEAD b384cd95eb9c6f73ad84ed1bb0717a26e29cc78f It's the second time I try to submit this bug, I think last time it failed because the attached core dump size (400M compressed). Have a look if you can get that file, otherwise I will try to update this ticket once it's created: (Error ID: OOPS-65553b72bc14be693eb1e37814ff9267) To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1751674/+subscriptions