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Diffstat (limited to 'results/classifier/accel-gemma3:12b/kvm/1681439')
| -rw-r--r-- | results/classifier/accel-gemma3:12b/kvm/1681439 | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/results/classifier/accel-gemma3:12b/kvm/1681439 b/results/classifier/accel-gemma3:12b/kvm/1681439 new file mode 100644 index 000000000..64123f5d2 --- /dev/null +++ b/results/classifier/accel-gemma3:12b/kvm/1681439 @@ -0,0 +1,36 @@ + +dma_blk_cb leaks memory map handles on misaligned IO + +Since upgrading to QEMU 2.8.0, my Windows 7 64-bit virtual machines +started crashing due to the assertion quoted in the summary failing. +The assertion in question was added by commit 9972354856 ("block: add +BDS field to count in-flight requests"). My tests show that setting +discard=unmap is needed to reproduce the issue. Speaking of +reproduction, it is a bit flaky, because I have been unable to come up +with specific instructions that would allow the issue to be triggered +outside of my environment, but I do have a semi-sane way of testing that +appears to depend on a specific initial state of data on the underlying +storage volume, actions taken within the VM and waiting for about 20 +minutes. + +Here is the shortest QEMU command line that I managed to reproduce the +bug with: + + qemu-system-x86_64 \ + -machine pc-i440fx-2.7,accel=kvm \ + -m 3072 \ + -drive file=/dev/lvm/qemu,format=raw,if=ide,discard=unmap \ + -netdev tap,id=hostnet0,ifname=tap0,script=no,downscript=no,vhost=on \ + -device virtio-net-pci,netdev=hostnet0 \ + -vnc :0 + +The underlying storage (/dev/lvm/qemu) is a thin LVM snapshot. + +QEMU was compiled using: + + ./configure --python=/usr/bin/python2.7 --target-list=x86_64-softmmu + make -j3 + +My virtualization environment is not really a critical one and +reproduction is not that much of a hassle, so if you need me to gather +further diagnostic information or test patches, I will be happy to help. \ No newline at end of file |