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Require Linux >= 5.10 instead of 5.15.
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2021.08.x does not build on Linux 5.15+ due to the following error.
interpret.c:48:10: fatal error: linux/ipx.h: No such file or directory
48 | #include <linux/ipx.h>
It was fixed in the newer buildroot versions.
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Currently the following errors happen during boot:
mount: mounting mqueue on /dev/mqueue failed: No such file or directory
mount: mounting hugetlbfs on /dev/hugepages failed: No such file or directory
mount: mounting fuse.lxcfs on /var/lib/lxcfs failed: No such file or directory
Remove these mounts.
Mounting of /dev/mqueue and /dev/hugepages fails because these dirs don't exist
and the buildroot init does not create them for some reason. We can't pre-create
them because /dev is itself mounted as devtmpfs.
But we also don't need these mounts. Both mqueue and hugetlbfs are trivial to mount
and the fuzzer does not have problems mounting them locally and using (we have good
coverage anyway).
fuse.lxcfs is simply a fuse filesystem (".lxcfs" is ignored). We don't need to mount
an empty global fuse filesystem. And it won't work w/o a userspace server anyway.
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It's not necessary any longer because now we're using binderfs.
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We used to use Debian-based images, but they have several issues:
1. They boot too slowly (we don't need full systemd power).
2. Systemd mounts cgroup controllers so that we can't use them during fuzzing
(can be mounted only once).
3. We have poor control over contents of the image.
This script creates lightweight buildroot-based images that boot fast.
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