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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
commitd0c85e36e4de67af628d54e9ab577cc3fad7796a (patch)
treef8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/deepseek-2-tmp/output/device/1661758
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloademulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
emulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.zip
add deepseek and gemma results
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-
-qemu-nbd causes data corruption in VDI-format disk images
-
-Hi,
-
-This is a duplicate of #1422307. I can't figure out a way to re-open
-it--the status of "Fix Released" is changeable only by a project
-maintainer or bug supervisor--so I'm opening a new bug to make sure
-this gets looked at again.
-
-qemu-nbd will sometimes corrupt VDI disk images. The bug was thought
-to be fixed in commit f0ab6f109630940146cbaf47d0cd99993ddba824, but
-I'm able to reproduce it in both that commit and in the latest commit
-(a951316b8a5c3c63254f20a826afeed940dd4cba). I just needed to run more
-iterations of the test. It's possible that it was partially fixed, or
-that the added serialization made it harder to catch this
-non-deterministic bug, but the same symptoms persist: data corruption
-of VDI-format disk images.
-
-This affects at least qemu-nbd. I haven't tried reproducing the issue
-with qemu proper or qemu-img, but the original bug report suggests
-that the bug in the common VDI backend may corrupt data written by
-those programs.
-
-Please let me know if I can provide any further information or help
-with testing. Thank you very much for looking into this!
-
-Test procedure
-**************
-
-The procedure used is the one given by Max Reitz (xanclic) in the
-original bug report, comment 3
-(https://bugs.launchpad.net/qemu/+bug/1422307/comments/3), in the
-section "VDI and NBD over /dev/nbd0", but with up to 1000 iterations
-instead of 10:
-
- $ cd ~/qemu-origfix-f0ab6f1/bin
- $ dd if=/dev/urandom of=blob.raw bs=1M count=64
- 64+0 records in
- 64+0 records out
- 67108864 bytes (67 MB) copied, 4.36475 s, 15.4 MB/s
- $ sudo sh -c 'for i in $(seq 0 999); do ./qemu-img create -f vdi test.vdi 64M > /dev/null; ./qemu-nbd -c /dev/nbd0 test.vdi; sleep 1; ./qemu-img convert -n blob.raw /dev/nbd0; ./qemu-img convert /dev/nbd0 test1.raw; sync; echo 1 > /proc/sys/vm/drop_caches; ./qemu-img convert /dev/nbd0 test2.raw; ./qemu-nbd -d /dev/nbd0 > /dev/null; if ! ./qemu-img compare -q test1.raw test2.raw; then md5sum test1.raw test2.raw; echo "$i failed"; break; fi; done; echo "done"'
-27a66c3a8ac2cf06f2c925968ea9e964 test1.raw
-2da9bf169041a7c2bd144c4ab3a29aea test2.raw
-64 failed
-done
-
-I've run this process a handful of times, and I've seen it take as
-little as 10 iterations and as many as 161 (taking 32 minutes in the
-latter case). Please be patient. Putting the images on tmpfs will
-probably help it go faster, and I have successfully reproduced the
-issue on tmpfs in addition to ext4.
-
-Nothing different was needed to reproduce the issue in a directory
-containing a build of the latest commit. It still takes somewhere
-around 1-200 iterations to find, in my testing.
-
-Build procedure
-***************
-
- $ git clone git://git.qemu-project.org/qemu.git
- [omitted]
- $ git clone qemu qemu-origfix-f0ab6f1
- Cloning into 'qemu-origfix-f0ab6f1'...
- done.
- $ cd qemu-origfix-f0ab6f1
- $ git checkout f0ab6f109630940146cbaf47d0cd99993ddba824
- Note: checking out 'f0ab6f109630940146cbaf47d0cd99993ddba824'.
-
- You are in 'detached HEAD' state. You can look around, make experimental
- changes and commit them, and you can discard any commits you make in this
- state without impacting any branches by performing another checkout.
-
- If you want to create a new branch to retain commits you create, you may
- do so (now or later) by using -b with the checkout command again. Example:
-
- git checkout -b new_branch_name
-
- HEAD is now at f0ab6f1... block/vdi: Add locking for parallel requests
- $ mkdir bin
- $ cd bin
- $ script -c'time (../configure --enable-debug --target-list=x86_64-softmmu && make -j6; echo "result: $?")'
- Script started, file is typescript
- [omitted; the build typescript is attached separately]
- LINK x86_64-softmmu/qemu-system-x86_64
- result: 0
-
- real 1m5.733s
- user 2m3.904s
- sys 0m13.828s
- Script done, file is typescript
-
-Nothing different was done when building the latest commit (besides
-cloning to a different directory, and not running `git checkout`).
-
-Environment
-***********
-
- * Machine: x86_64
-
- * Hypervisor: Xen 4.4 (Debian package xen-hypervisor-4.4-amd64,
- version 4.4.1-9+deb8u8)
-
- * A Xen domU (guest) for building QEMU and reproducing the issue.
- All testing was done within the virtual machine for convenience
- and access to better hardware than what I have for my development
- machine (I expected the build to take much longer than it really
- does).
-
- - x86_64 architecture with six VCPUs and 1.2 GiB RAM allocated,
- operating in HVM (fully virtualized) mode.
-
- - Distribution: Debian 8.7 Jessie amd64
-
- - Kernel: Linux 3.16.0 x86_64 (Debian package
- linux-image-3.16.0-4-amd64, version 3.16.39-1)
-
- - Compiler: GCC 4.9.2 (Debian package gcc-4.9, version 4.9.2-10) \ No newline at end of file