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device: 0.880
instruction: 0.878
graphic: 0.677
boot: 0.479
network: 0.450
vnc: 0.409
semantic: 0.363
socket: 0.169
mistranslation: 0.093
other: 0.054
assembly: 0.045
KVM: 0.020
Data Race in data->cb() call and cb assignment in test-aio-multithread
Description of problem:
Potential data races between the `data->cb()` call and the assignment of `cb` in `test-aio-multithread` were identified using TSAN.
Steps to reproduce:
```sh
QEMU_BUILD_DIR=<path to the QEMU build directory>
QEMU_DIR=<path to the QEMU repository directory>
configure --enable-tsan --cc=clang --cxx=clang++ --enable-trace-backends=ust --enable-fdt=system --disable-slirp
make tests/unit/test-bdrv-drain
MALLOC_PERTURB_=102 G_TEST_SRCDIR=$QEMU_BUILD_DIR/tests/unit G_TEST_BUILDDIR=$QEMU_BUILD_DIR/tests/unit $QEMU_BUILD_DIR/tests/unit/test-aio-multithread --tap -k
```
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