Buffer I/O error on dev vda, logical block 5, async page read blk_update_request: I/O error, dev vda, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Buffer I/O error on dev vda, logical block 4, async page read blk_update_request: I/O error, dev vda, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Buffer I/O error on dev vda, logical block 3, async page read blk_update_request: I/O error, dev vda, sector 3 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Buffer I/O error on dev vda, logical block 2, async page read blk_update_request: I/O error, dev vda, sector 2 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Buffer I/O error on dev vda, logical block 1, async page read blk_update_request: I/O error, dev vda, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Buffer I/O error on dev vda, logical block 0, async page read blk_update_request: I/O error, dev vda, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 vda: detected capacity change from 0 to 2000138124800 On one machine (EPYC 7742), the partition table cannot be read and on another (Ryzen 9 3950X), ext4 detects weirdness with journaling and ultimately remounts the guest disk to R/O: The guest VM is unable to handle I/O properly with io_uring, and nuking io="io_uring" fixes the issue. QEMU version is 5.2+dfsg-9ubuntu3 and libvirt version is 7.0.0-2ubuntu2. With the latest Ubuntu 20.04's HWE kernel 5.8.0-59, I'm noticing some weirdness when using QEMU/libvirt with the following storage configuration: Possible io_uring regression with QEMU on Ubuntu's kernel
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