The attached script successfully deadlocks 9228ac3a69c4.
DES
--
Dag-Erling Smørgrav - d...@freebsd.org
#!/bin/sh
: ${n:=$(nproc)}
: ${pool:=zroot}
basefs="${pool}/zfsdl"
set -eu
zfs destroy -r "${basefs}" >/dev/null 2>&1 || true
zfs create -o com.sun:auto-snapshot=false "${basefs}"
basedir="$(zfs get -H -o value mountpoint "${basefs}")"
echo "preparing tarball..." >&2
tarball="${basedir}/zfsdl.tar"
mkdir "${basedir}/src"
(cd /usr/src ; find * -type d) | (cd "${basedir}/src" ; xargs mkdir -p)
(cd /usr/src ; find * -type f) | (cd "${basedir}/src" ; xargs touch)
tar cf "${tarball}" -C "${basedir}" src
zfs_deadlock() {
local fs=$1 dir
zfs create "${fs}"
dir="$(zfs get -H -o value mountpoint "${fs}")"
zfs snapshot "${fs}@empty"
while ! [ -f "${basedir}/stop" ] ; do
echo "fill ${fs}..." >&2
tar xf "${tarball}" -C "${dir}"
echo "rollback ${fs}..." >&2
zfs rollback -rR "${fs}@empty"
done
}
for i in $(seq -w "${n}") ; do
zfs_deadlock "${basefs}/${i}" &
sleep 1
done
wait
echo "stop" >&2
zfs destroy -r "${basefs}"
