Description of problem: qemu and grub2 rescue floppy don't get along Version-Release number of selected component (if applicable): 0.15.1 How reproducible: Always Steps to Reproduce: 1. grub2-mkrescue -o test.img 2. qemu -fda test.img 3. Actual results: SeaBIOS (version 0.6.2) Booting from Floppy... GRUB loading.... Welcome to GRUB! error: out of disk. Entering rescue mode... grub rescue> Expected results: Some of the above messages seem to be shortly showed. Then we get: GNU GRUB version 1.99 Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists possible device or file completions. grub> Additional info: 0) The images that grub2-mkrescue creates are odd mixtures of ISO images and disk images: file -r -k test.img test.img: # ISO 9660 CD-ROM filesystem data 'ISOIMAGE ' (bootable) - x86 boot sector; partition 1: ID=0xcd, active, starthead 0, startsector 1, 4455 sectors, code offset 0x63 DOS executable (COM), boot code 1) The test image I use has a 2281472 byte size. If I append that with zeroes to 2880 KB (2949120 bytes) then I get the expected results. So there's a workaround. But I don't think it's an obvious workaround. 2) It's debatable whether this is a bug. If it's considered a bug, I'm not sure whether qemu and/or grub2 is to blame. Should qemu (silently) handle (floppy) disk image between 1440 KB and 2880 KB as if they actually were 2880 KB in size? Or should grub2, if possible, zero pad the images it creates to (in this case) a 2880 KB size? 3) Please note that there seems to be little one can do to leave "grub rescue" mode. Ie, "insmod normal" will fail too: grub rescue> insmod normal error: out of disk.
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I can still reproduce issues with latest upstream qemu, though the error message is a little different. Given that this is kind of an obscure bug that's existed for a while, I've filed it upstream, please follow this report if you are still interested: https://bugs.launchpad.net/qemu/+bug/1122492