https://bugzilla.kernel.org/show_bug.cgi?id=219166 --- Comment #6 from Richard W.M. Jones (rjones@xxxxxxxxxx) --- Yes I can reproduce this inside a software emulated VM with another 6.11.0 Fedora kernel. I will bisect this later, but for now reproduction instructions are given below. (1) Install a Fedora 40 virtual machine. I used the command below but other ways are available: virt-builder fedora-40 --size=10G --root-password=password:123456 (2) Run the VM in qemu with software emulation (TCG): qemu-system-x86_64 -machine accel=tcg -cpu qemu64 -m 4096 -drive file=/var/tmp/fedora-40.qcow2,format=qcow2,if=virtio (3) Inside the VM, log in as root/123456, install fio, and update the kernel: dnf install fedora-repos-rawhide dnf install fio dnf update kernel reboot (should upgrade to 6.11.0 and boot into that kernel). (4) Inside the VM, in one terminal run: while true; do echo noop > /sys/block/sda/queue/scheduler 2>/dev/null ; done (5) Inside the VM, in another terminal run fio with the following config or similar: [global] name=fio-rand-write filename=/root/fio-rand-write rw=randwrite bs=4K numjobs=4 time_based runtime=1h group_reporting [file1] size=1G ioengine=libaio iodepth=64 (6) After a while the fio process ETA will start counting up (since one or more threads have got stuck and are not making progress). Also logging in is problematic and many common commands like 'dmesg' or 'ps' hang. I could only recover by rebooting. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
