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task blocked for more than X seconds - events drm_fb_helper_dirty_work
I've had bunches of these errors on 9 different boots, between 2019-08-21 and now, with Arch host and guest, from linux 5.1.16 to 5.2.14 on host and guest, with QEMU 4.0.0 and 4.1.0. spice 0.14.2, spice-gtk 0.37, spice-protocol 0.14.0, virt-viewer 8.0.
I've been fighting with some other issues related to a 5.2 btrfs regression, a QEMU qxl regression (see bug 1843151) which I ran into when trying to temporarily abandon virtio-vga, and I haven't paid enough attention to what impact it has on the system when these occur. In journalctl, I can see I often rebooted minutes after they occurred, but sometimes much later. That must mean whenever I saw it happen that I rebooted the VM, or potentially it impacted functionality of the system.
Please let me know if and how I can get more information for you if needed.
I've replicated this on both a system with integrated ASPEED video, and on an AMD Vega 64 running amdgpu.
As an example, I have one boot which reported at 122 seconds, 245, 368, 491, 614, 737, 860, 983, 1105, 1228, then I rebooted.
I have another that reported 122/245/368/491/614/737, went away for 10 minutes, then started reporting again 122/245/368/491, and went away. Then, I rebooted about 20 hours later.
Host system has no graphical impact when this happens, and logs nothing in its journalctl.
==========
INFO: task kworker/0:1:15 blocked for more than 122 seconds.
Not tainted 5.2.14-1 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:1 D 0 15 2 0x800004000
Workqueue: events drm_fb_helper_dirty_work [drm_kms_helper]
Call Trace:
? __schedule+0x27f/0x6d0
schedule+0x3d/0xc0
virtio_gpu_queue_fenced_ctrl_buffer+0xa1/0x130 [virtio_gpu]
? wait_woken+0x80/0x80
virtio_gpu_surface_dirty+0x2a5/0x300 [virtio_gpu]
drm_fb_helper_dirty_work+0x156/0x160 [drm_kms_helper]
process_one_work+0x19a/0x3b0
worker_tread+0x50/0x3a0
kthread+0xfd/0x130
? process_one_work+0x3b0/0x3b0
? kthread_park+0x80/0x80
ret_from_fork+0x35/0x40
==========
/usr/bin/qemu-system-x86_64 \
-name vm,process=qemu:vm \
-no-user-config \
-nodefaults \
-nographic \
-uuid <uuid> \
-pidfile <pidfile> \
-machine q35,accel=kvm,vmport=off,dump-guest-core=off \
-cpu SandyBridge-IBRS \
-smp cpus=4,cores=2,threads=1,sockets=2 \
-m 4G \
-drive if=pflash,format=raw,readonly,file=/usr/share/ovmf/x64/OVMF_CODE.fd \
-drive if=pflash,format=raw,file=/var/qemu/efivars/vm.fd \
-monitor telnet:localhost:8000,server,nowait,nodelay \
-spice unix,addr=/tmp/spice.vm.sock,disable-ticketing \
-device ioh3420,id=pcie.1,bus=pcie.0,slot=0 \
-device virtio-vga,bus=pcie.1,addr=0 \
-usbdevice tablet \
-netdev bridge,id=network0,br=br0 \
-device virtio-net-pci,netdev=network0,mac=F4:F6:34:F6:34:2d,bus=pcie.0,addr=3 \
-device virtio-scsi-pci,id=scsi1 \
-drive driver=raw,node-name=hd0,file=/dev/lvm/vm,if=none,discard=unmap,cache=none,aio=threads
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