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Diffstat (limited to 'results/classifier/deepseek-r1:14b/output/files/1901892')
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1 files changed, 39 insertions, 0 deletions
diff --git a/results/classifier/deepseek-r1:14b/output/files/1901892 b/results/classifier/deepseek-r1:14b/output/files/1901892 new file mode 100644 index 000000000..23802fe88 --- /dev/null +++ b/results/classifier/deepseek-r1:14b/output/files/1901892 @@ -0,0 +1,39 @@ + +qemu-img create corrupts the qcow2 if the file already exists + +When creating a disk using qemu-img create command, if the destination path of the qcow2 file already exists, it will show the error saying that it cannot get a lock so it exits with exit status 1 but it will corrupt the qcow2 file anyway. + +Steps to reproduce: +1. Have a guest running with a root (vda) and a second device (vdc). +In my case is a clean Ubuntu 16.04 image with kernel 4.4.0-190-generic x86_64 +vdc disk is called testadddisk-3.qcow2 +2. vdc is an xfs over lvm. +pvcreacte /dev/vdc +vgcreate myVg /dev/vdc +lvcreate -l+100%FREE -n myLv myVg +mkfs.xfs /dev/mapper/myVg-myLv +mount /dev/mapper/myVg-myLv /mnt +3. Create disk IO on that device in the guest. +while true ; do dd if=/dev/zero of=/mnt/testfile bs=1024 count=1000 ; sleep 1; done +4. Execute the command to create a new device but use the same name of the device attached: +sudo qemu-img create -f qcow2 testadddisk-3.qcow2 20G +The output of the command is this: +Formatting 'testadddisk-3.qcow2', fmt=qcow2 size=21474836480 cluster_size=65536 lazy_refcounts=off refcount_bits=16 +qemu-img: testadddisk-3.qcow2: Failed to get "write" lock +Is another process using the image? + +The write continues in the guest but when it is shutdown, when it is powered on again you get this: +error: Failed to start domain testadddisk +error: internal error: process exited while connecting to monitor: 2020-10-27T22:00:51.628374Z qemu-system-x86_64: -drive file=/var/lib/vmImages/testadddisk-3.qcow2,format=qcow2,if=none,id=drive-virtio-disk2: Image is not in qcow2 format + +I run the qemu-img create command with an strace and I believe that first it tries to open the file in write mode, then does a truncate on it and after that says it cannot get a lock. The output is in the file attached. As well as the guest xml just in case. + +The host: +Ubuntu 18.04.5 LTS +4.15.0-112-generic x86_64 +qemu packages installed: +ii qemu-block-extra:amd64 1:2.11+dfsg-1ubuntu7.32 amd64 extra block backend modules for qemu-system and qemu-utils +ii qemu-kvm 1:2.11+dfsg-1ubuntu7.31 amd64 QEMU Full virtualization on x86 hardware +ii qemu-system-common 1:2.11+dfsg-1ubuntu7.32 amd64 QEMU full system emulation binaries (common files) +ii qemu-system-x86 1:2.11+dfsg-1ubuntu7.31 amd64 QEMU full system emulation binaries (x86) +ii qemu-utils 1:2.11+dfsg-1ubuntu7.32 amd64 QEMU utilities \ No newline at end of file |