diff options
Diffstat (limited to 'results/classifier/105/other/2819')
| -rw-r--r-- | results/classifier/105/other/2819 | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/results/classifier/105/other/2819 b/results/classifier/105/other/2819 new file mode 100644 index 000000000..c78a8162d --- /dev/null +++ b/results/classifier/105/other/2819 @@ -0,0 +1,130 @@ +other: 0.706 +device: 0.705 +graphic: 0.682 +KVM: 0.679 +assembly: 0.674 +instruction: 0.671 +vnc: 0.667 +semantic: 0.660 +mistranslation: 0.655 +network: 0.654 +socket: 0.652 +boot: 0.622 + +QEMU 9.2.0 hangs with 100% CPU when using `-vnc` on Loongarch (3A6000 and 3C6000) +Description of problem: +When launching VMs with the `-vnc` parameter (generated by `<graphics type='vnc'>`) on a Loongarch (Loongson 3A6000 or Loongson 3C6000) machine. QEMU process hangs indefinitely with 100% CPU usage, no VNC output. +Steps to reproduce: +1. Create a VM using libvirt (Cockpit-Machines or virt-manager). +2. Configure VNC graphics as follows in libvirt XML, which is provided by Cockpit-Machines by default. +```xml +<graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'> + <listen type='address' address='127.0.0.1'/> +</graphics> +``` +3. Start the VM: QEMU process hangs indefinitely with 100% CPU usage, no VNC output. +Additional information: +- Removing the `-vnc` parameter from the QEMU command line (via removing <graphics ... In libvirt XML) resolves the issue. +- The issue appears to stem from changes introduced after QEMU 9.0.1, as downgrading resolves the problem. +- Libvirtd log: https://aosc.io/paste/detail?id=da60d57c-5040-4326-a622-6a692eab488a +- QEMU command line: https://aosc.io/paste/detail?id=30c97bd5-e666-4578-adfd-236cc1fe02ef +- Full Libvirt VM XML: https://aosc.io/paste/detail?id=6bff0fed-d805-4c36-afb7-d14f29d6313b +- No activity in `strace` during the hang. +- GDB backtrace shows the process stuck in `ppoll` (full trace below): +``` +(gdb) bt + #0 0x00007ffff189cad0 in __GI_ppoll (fds=0x7fffa4068d00, nfds=10, timeout=<optimized out>, sigmask=0x0) + at ../sysdeps/unix/sysv/linux/ppoll.c:42 + #1 0x0000555557e67320 in qemu_poll_ns () + #2 0x0000555557e636a4 in main_loop_wait () + #3 0x0000555557a0c4d4 in qemu_main_loop () + #4 0x0000555557d79cc8 in qemu_default_main () + #5 0x00007ffff17c8f30 in __libc_start_call_main + (main=main@entry=0x5555577969c0 <main>, argc=argc@entry=119, argv=argv@entry=0x7ffffbad5508) + at ../sysdeps/nptl/libc_start_call_main.h:58 + #6 0x00007ffff17c9020 in __libc_start_main_impl + (main=0x5555577969c0 <main>, argc=119, argv=0x7ffffbad5508, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=<optimized out>) at ../csu/libc-start.c:360 + #7 0x0000555557797b70 in _start () +``` +- Qemu full command line: +``` +LC_ALL=C \ +PATH=/usr/local/bin:/usr/bin \ +USER=root \ +HOME=/var/lib/libvirt/qemu/domain-5-buildbot-new \ +XDG_DATA_HOME=/var/lib/libvirt/qemu/domain-5-buildbot-new/.local/share \ +XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain-5-buildbot-new/.cache \ +XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain-5-buildbot-new/.config \ +/usr/bin/qemu-system-loongarch64 \ +-name guest=buildbot-new,debug-threads=on \ +-S \ +-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-5-buildbot-new/master-key.aes"}' \ +-blockdev '{"driver":"file","filename":"/usr/share/qemu/edk2-loongarch64-code.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/buildbot-new_VARS.fd","node-name":"libvirt-pflash1-storage","read-only":false}' \ +-machine virt,usb=off,dump-guest-core=off,memory-backend=loongarch.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-storage,acpi=on \ +-accel kvm \ +-cpu la464 \ +-m size=1048576k \ +-object '{"qom-type":"memory-backend-ram","id":"loongarch.ram","size":1073741824}' \ +-overcommit mem-lock=off \ +-smp 1,sockets=1,dies=1,clusters=1,cores=1,threads=1 \ +-uuid c56a24b5-c539-4240-9c72-39fd0d0de860 \ +-no-user-config \ +-nodefaults \ +-chardev socket,id=charmonitor,fd=33,server=on,wait=off \ +-mon chardev=charmonitor,id=monitor,mode=control \ +-rtc base=utc \ +-no-shutdown \ +-boot strict=on \ +-device '{"driver":"pcie-root-port","port":8,"chassis":1,"id":"pci.1","bus":"pcie.0","multifunction":true,"addr":"0x1"}' \ +-device '{"driver":"pcie-root-port","port":9,"chassis":2,"id":"pci.2","bus":"pcie.0","addr":"0x1.0x1"}' \ +-device '{"driver":"pcie-root-port","port":10,"chassis":3,"id":"pci.3","bus":"pcie.0","addr":"0x1.0x2"}' \ +-device '{"driver":"pcie-root-port","port":11,"chassis":4,"id":"pci.4","bus":"pcie.0","addr":"0x1.0x3"}' \ +-device '{"driver":"pcie-root-port","port":12,"chassis":5,"id":"pci.5","bus":"pcie.0","addr":"0x1.0x4"}' \ +-device '{"driver":"pcie-root-port","port":13,"chassis":6,"id":"pci.6","bus":"pcie.0","addr":"0x1.0x5"}' \ +-device '{"driver":"pcie-root-port","port":14,"chassis":7,"id":"pci.7","bus":"pcie.0","addr":"0x1.0x6"}' \ +-device '{"driver":"pcie-root-port","port":15,"chassis":8,"id":"pci.8","bus":"pcie.0","addr":"0x1.0x7"}' \ +-device '{"driver":"pcie-root-port","port":16,"chassis":9,"id":"pci.9","bus":"pcie.0","multifunction":true,"addr":"0x2"}' \ +-device '{"driver":"pcie-root-port","port":17,"chassis":10,"id":"pci.10","bus":"pcie.0","addr":"0x2.0x1"}' \ +-device '{"driver":"pcie-root-port","port":18,"chassis":11,"id":"pci.11","bus":"pcie.0","addr":"0x2.0x2"}' \ +-device '{"driver":"pcie-root-port","port":19,"chassis":12,"id":"pci.12","bus":"pcie.0","addr":"0x2.0x3"}' \ +-device '{"driver":"pcie-root-port","port":20,"chassis":13,"id":"pci.13","bus":"pcie.0","addr":"0x2.0x4"}' \ +-device '{"driver":"pcie-root-port","port":21,"chassis":14,"id":"pci.14","bus":"pcie.0","addr":"0x2.0x5"}' \ +-device '{"driver":"pcie-root-port","port":22,"chassis":15,"id":"pci.15","bus":"pcie.0","addr":"0x2.0x6"}' \ +-device '{"driver":"pcie-pci-bridge","id":"pci.16","bus":"pci.1","addr":"0x0"}' \ +-device '{"driver":"qemu-xhci","p2":15,"p3":15,"id":"usb","bus":"pci.3","addr":"0x0"}' \ +-device '{"driver":"virtio-scsi-pci","id":"scsi0","bus":"pci.8","addr":"0x0"}' \ +-device '{"driver":"virtio-serial-pci","id":"virtio-serial0","bus":"pci.4","addr":"0x0"}' \ +-blockdev '{"driver":"file","filename":"/mnt/data/aosc-os_installer_20241122_loongarch64.iso","node-name":"libvirt-1-storage","read-only":true}' \ +-device '{"driver":"scsi-cd","bus":"scsi0.0","channel":0,"scsi-id":0,"lun":0,"device_id":"drive-scsi0-0-0-0","drive":"libvirt-1-storage","id":"scsi0-0-0-0"}' \ +-chardev pty,id=charserial0 \ +-serial chardev:charserial0 \ +-chardev socket,id=charchannel0,fd=32,server=on,wait=off \ +-device '{"driver":"virtserialport","bus":"virtio-serial0.0","nr":1,"chardev":"charchannel0","id":"channel0","name":"org.qemu.guest_agent.0"}' \ +-chardev spicevmc,id=charchannel1,name=vdagent \ +-device '{"driver":"virtserialport","bus":"virtio-serial0.0","nr":2,"chardev":"charchannel1","id":"channel1","name":"com.redhat.spice.0"}' \ +-device '{"driver":"usb-tablet","id":"input0","bus":"usb.0","port":"1"}' \ +-device '{"driver":"usb-kbd","id":"input1","bus":"usb.0","port":"2"}' \ +-audiodev '{"id":"audio1","driver":"spice"}' \ +-vnc 127.0.0.1:0,audiodev=audio1 \ +-spice port=5901,addr=127.0.0.1,disable-ticketing=on,image-compression=off,seamless-migration=on \ +-device '{"driver":"virtio-gpu-pci","id":"video0","max_outputs":1,"bus":"pci.7","addr":"0x0"}' \ +-device '{"driver":"ich9-intel-hda","id":"sound0","bus":"pci.16","addr":"0x1"}' \ +-device '{"driver":"hda-duplex","id":"sound0-codec0","bus":"sound0.0","cad":0,"audiodev":"audio1"}' \ +-device '{"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.5","addr":"0x0"}' \ +-object '{"qom-type":"rng-random","id":"objrng0","filename":"/dev/urandom"}' \ +-device '{"driver":"virtio-rng-pci","rng":"objrng0","id":"rng0","bus":"pci.6","addr":"0x0"}' \ +-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \ +-msg timestamp=on +``` +- I tried to reproduce the bug with a simple command but failed, not sure what is the real cause. Following commands works fine. +``` +qemu-system-loongarch64 -m 2G \ + -cpu la464 \ + -machine virt \ + -smp 2 \ + -bios /usr/share/qemu/edk2-loongarch64-code.fd \ + -vnc 127.0.0.1:0 \ + -device virtio-gpu-pci +``` |