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boot: 0.873
performance: 0.853
device: 0.846
graphic: 0.705
semantic: 0.678
vnc: 0.662
PID: 0.619
network: 0.568
permissions: 0.561
files: 0.485
other: 0.449
debug: 0.448
socket: 0.372
KVM: 0.204
Iothread is stuck at 100% CPU usage with virtio-scsi on QEMU 7.0.0
Description of problem:
Starting with QEMU 7.0.0, the iothread associated attached to a virtio-scsi controller is stuck at 100% CPU usage. Bisected to: https://gitlab.com/qemu-project/qemu/-/commit/826cc32423db2a99d184dbf4f507c737d7e7a4ae
- Works as expected without the iothread
- No issue with virtio-blk + iothread
- Same behavior regardless of io=threads/native/io_uring
- Same behavior with default vs increased queue count
- The issue is triggered when the guest OS initializes the virtio driver
Steps to reproduce:
1. Add virtio-scsi controller with iothread
2. Boot VM
3. Check per-thread CPU usage such as in htop
Additional information:
[fedora.log](/uploads/776fbf8e5b823d0ab326946684ef9022/fedora.log)
[fedora.xml](/uploads/54879e5adfb227ddef79d382e86fc608/fedora.xml)
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