I experienced an error about ehci current page on qemu + seabios v1.14: cpage out of range (5) processing error - resetting ehci HC
We know that the EHCI spec defines valid range of ehci cpage to 0-4, But here is a 5, Obviously it's an issue.
I added a EHCI controller, and attached a usb mass storage to the EHCI controller as boot device: host:~# qemu-system-x86_64 \ -accel kvm \ -bios /home/test/projects/seabios/out/bios.bin \ -m 4096 \ -device usb-ehci \ -blockdev driver=file,read-only=on,filename=/isos/openSUSE-Tumbleweed-GNOME-Live-x86_64-Snapshot20220314-Media.iso,node-name=iso \ -device usb-storage,drive=iso,bootindex=0
The issue is not 100% reproducible, I run the test 15 times with above steps, the issue occurs 1 or 2 times. The qemu version seems doesn't matter, I used to use qemu 5.2, 6.0 and latest git master, Got the same test result. It seems that the issue was introduced since seabios v1.14, It can be reproduced on latest seabios git master as well, It can't be reproduced on seabios 1.13 or older. The seabios commit b3fa8577 "kvm: add support for reading tsc frequency from kvmclock" seems to be the suspect.
We seem to be hitting the same bug at nixpkgs: https://github.com/NixOS/nixpkgs/issues/170803
This sometimes makes a VM test fail and prevents our unstable NixOS channel from updating.
lma, did you find that commit by bisecting?