Segmentation fault with PCI GPU
Host environment
- Operating system: Arch Linux
- OS/kernel version: Linux 6.12.4-arch1-1 #1 SMP PREEMPT_DYNAMIC Mon, 09 Dec 2024 14:31:57 +0000 x86_64 GNU/Linux
- Architecture: x64
- QEMU flavor: qemu-system-x86_64
- QEMU version: 9.1.2
- QEMU command line:
qemu-system-x86_64 -name guest=win10-2,debug-threads=on \
-S \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/x64/OVMF_CODE.4m.fd","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"raw","file":"libvirt-pflash0-storage"}' \
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/win10-2_VARS.fd","node-name":"libvirt-pflash1-storage","read-only":false}' \
-machine pc-q35-9.1,usb=off,vmport=off,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-storage,hpet=off,acpi=on \
-accel kvm \
-cpu host,migratable=on,hv-time=on,hv-relaxed=on,hv-vapic=on,hv-spinlocks=0x1fff \
-m size=4194304k \
-object '{"qom-type":"memory-backend-ram","id":"pc.ram","size":4294967296}' \
-overcommit mem-lock=off \
-smp 2,sockets=2,cores=1,threads=1 \
-uuid a11a42eb-9a63-44d2-8fdf-757aa4f9950c \
-no-user-config \
-nodefaults \
-rtc base=localtime,driftfix=slew \
-global kvm-pit.lost_tick_policy=delay \
-no-shutdown \
-global ICH9-LPC.disable_s3=1 \
-global ICH9-LPC.disable_s4=1 \
-boot strict=on \
-device '{"driver":"pcie-root-port","port":16,"chassis":1,"id":"pci.1","bus":"pcie.0","multifunction":true,"addr":"0x2"}' \
-device '{"driver":"pcie-root-port","port":17,"chassis":2,"id":"pci.2","bus":"pcie.0","addr":"0x2.0x1"}' \
-device '{"driver":"pcie-root-port","port":18,"chassis":3,"id":"pci.3","bus":"pcie.0","addr":"0x2.0x2"}' \
-device '{"driver":"pcie-root-port","port":19,"chassis":4,"id":"pci.4","bus":"pcie.0","addr":"0x2.0x3"}' \
-device '{"driver":"pcie-root-port","port":20,"chassis":5,"id":"pci.5","bus":"pcie.0","addr":"0x2.0x4"}' \
-device '{"driver":"pcie-root-port","port":21,"chassis":6,"id":"pci.6","bus":"pcie.0","addr":"0x2.0x5"}' \
-device '{"driver":"pcie-root-port","port":22,"chassis":7,"id":"pci.7","bus":"pcie.0","addr":"0x2.0x6"}' \
-device '{"driver":"pcie-root-port","port":23,"chassis":8,"id":"pci.8","bus":"pcie.0","addr":"0x2.0x7"}' \
-device '{"driver":"pcie-root-port","port":24,"chassis":9,"id":"pci.9","bus":"pcie.0","multifunction":true,"addr":"0x3"}' \
-device '{"driver":"pcie-root-port","port":25,"chassis":10,"id":"pci.10","bus":"pcie.0","addr":"0x3.0x1"}' \
-device '{"driver":"pcie-root-port","port":26,"chassis":11,"id":"pci.11","bus":"pcie.0","addr":"0x3.0x2"}' \
-device '{"driver":"pcie-root-port","port":27,"chassis":12,"id":"pci.12","bus":"pcie.0","addr":"0x3.0x3"}' \
-device '{"driver":"pcie-root-port","port":28,"chassis":13,"id":"pci.13","bus":"pcie.0","addr":"0x3.0x4"}' \
-device '{"driver":"pcie-root-port","port":29,"chassis":14,"id":"pci.14","bus":"pcie.0","addr":"0x3.0x5"}' \
-device '{"driver":"qemu-xhci","p2":15,"p3":15,"id":"usb","bus":"pci.2","addr":"0x0"}' \
-device '{"driver":"virtio-serial-pci","id":"virtio-serial0","bus":"pci.3","addr":"0x0"}' \
-blockdev '{"driver":"file","filename":"/home/edward/vms/win10-2.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-2-format","read-only":false,"driver":"qcow2","file":"libvirt-2-storage","backing":null}' \
-device '{"driver":"ide-hd","bus":"ide.0","drive":"libvirt-2-format","id":"sata0-0-0","bootindex":1}' \
-blockdev '{"driver":"file","filename":"/home/edward/Torrents/en-us_windows_10_iot_enterprise_ltsc_2021_x64_dvd_257ad90f.iso","node-name":"libvirt-1-storage","read-only":true}' \
-device '{"driver":"ide-cd","bus":"ide.1","drive":"libvirt-1-storage","id":"sata0-0-1"}' \
-chardev pty,id=charserial0 \
-device '{"driver":"isa-serial","chardev":"charserial0","id":"serial0","index":0}' \
-chardev spicevmc,id=charchannel0,name=vdagent \
-device '{"driver":"virtserialport","bus":"virtio-serial0.0","nr":1,"chardev":"charchannel0","id":"channel0","name":"com.redhat.spice.0"}' \
-device '{"driver":"usb-tablet","id":"input0","bus":"usb.0","port":"1"}' \
-audiodev '{"id":"audio1","driver":"spice"}' \
-spice port=5900,addr=127.0.0.1,disable-ticketing=on,image-compression=off,seamless-migration=on \
-device '{"driver":"qxl-vga","id":"video0","max_outputs":1,"ram_size":67108864,"vram_size":67108864,"vram64_size_mb":0,"vgamem_mb":16,"bus":"pcie.0","addr":"0x1"}' \
-device '{"driver":"ich9-intel-hda","id":"sound0","bus":"pcie.0","addr":"0x1b"}' \
-device '{"driver":"hda-duplex","id":"sound0-codec0","bus":"sound0.0","cad":0,"audiodev":"audio1"}' \
-global ICH9-LPC.noreboot=off \
-watchdog-action reset \
-chardev spicevmc,id=charredir0,name=usbredir \
-device '{"driver":"usb-redir","chardev":"charredir0","id":"redir0","bus":"usb.0","port":"2"}' \
-chardev spicevmc,id=charredir1,name=usbredir \
-device '{"driver":"usb-redir","chardev":"charredir1","id":"redir1","bus":"usb.0","port":"3"}' \
-device '{"driver":"vfio-pci","host":"0000:04:00.0","id":"hostdev0","bus":"pci.5","addr":"0x0","rombar":1}' \
-device '{"driver":"vfio-pci","host":"0000:04:00.1","id":"hostdev1","bus":"pci.6","addr":"0x0","rombar":1}' \
-device '{"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.4","addr":"0x0"}' \
-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
-msg timestamp=onEmulated/Virtualized environment
- Operating system: Windows 10
- OS/kernel version: NT
- Architecture: x64
Description of problem
Upon attempting to launch the virtual machine, Qemu crashes with Segfault. The issue only occurs it's launched with a passthrough GPU with the vfio driver. It is an Nvidia RTX 3060 GPU. The VM boots fine without the GPU PCI device added.
Steps to reproduce
- Create a VM with the GPU PCI device added
- Attempt to boot it
- virt-manager will display: "libvirt.libvirtError: internal error: QEMU unexpectedly closed the monitor"
Additional information
GDB backtrace:
Thread 1 "qemu-system-x86" received signal SIGSEGV, Segmentation fault.
Downloading 116.51 K source file /usr/src/debug/qemu/build/../qemu-9.1.2/system/memory.c
memory_region_update_container_subregions () at ../qemu-9.1.2/system/memory.c:2616
2616 QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
(gdb) bt
#0 memory_region_update_container_subregions () at ../qemu-9.1.2/system/memory.c:2616
#1 memory_region_add_subregion_common () at ../qemu-9.1.2/system/memory.c:2640
#2 0x0000555555ade66a in memory_region_add_subregion_overlap () at ../qemu-9.1.2/system/memory.c:2657
#3 vfio_probe_nvidia_bar0_quirk () at ../qemu-9.1.2/hw/vfio/pci-quirks.c:966
#4 vfio_bar_quirk_setup () at ../qemu-9.1.2/hw/vfio/pci-quirks.c:1259
#5 0x0000555555ae8212 in vfio_realize () at ../qemu-9.1.2/hw/vfio/pci.c:3133
#6 0x000055555586c3ab in pci_qdev_realize () at ../qemu-9.1.2/hw/pci/pci.c:2097
#7 0x0000555555b924f3 in device_set_realized () at ../qemu-9.1.2/hw/core/qdev.c:510
#8 0x0000555555b9c37f in property_set_bool () at ../qemu-9.1.2/qom/object.c:2354
#9 0x0000555555b9a21a in object_property_set () at ../qemu-9.1.2/qom/object.c:1463
#10 0x0000555555b9abbf in object_property_set_qobject () at ../qemu-9.1.2/qom/qom-qobject.c:28
#11 object_property_set_bool () at ../qemu-9.1.2/qom/object.c:1533
#12 0x000055555594dafb in qdev_device_add_from_qdict () at ../qemu-9.1.2/system/qdev-monitor.c:719
#13 0x00005555559586f1 in qemu_create_cli_devices () at ../qemu-9.1.2/system/vl.c:2664
#14 qmp_x_exit_preconfig () at ../qemu-9.1.2/system/vl.c:2721
#15 0x0000555555962396 in qemu_init () at ../qemu-9.1.2/system/vl.c:3766
#16 0x00005555556d2abd in main () at ../qemu-9.1.2/system/main.c:47dmesg:
[ 4846.200960] qemu-system-x86[26518]: segfault at b8 ip 00006149e75a64e6 sp 00007fff4c85fbe0 error 4 in qemu-system-x86_64[5c24e6,6149e7155000+72c000] likely on CPU 4 (core 4, socket 0)
[ 4846.200968] Code: 2e 01 83 c0 01 89 05 0d cd 2e 01 48 8b 43 40 48 85 c0 74 16 ba 01 00 00 00 f0 0f c1 50 18 81 fa fe ff ff 7f 0f 87 c4 00 00 00 <49> 8b 84 24 b8 00 00 00 48 85 c0 74 55 8b 93 b0 00 00 00 eb 11 0fEdited by teodor 0921