Description of problem:
An initrd generated with dracut-050-1 with the busybox module enabled boots to a shell without a working /dev or the root filesystem mounted, and complaints about /dev/tty2 - /dev/tty4 being unavailable every few seconds. The previous version of dracut (049-27.git20181204.fc32.2) worked, and it works if I remove busybox from add_dracutmodules.

Version-Release number of selected component (if applicable): dracut-050-1.fc32.x86_64

How reproducible:
always

Steps to Reproduce:
1. put add_dracutmodules+=" busybox" in /etc/dracut.conf.d/busybox.conf
2. dracut --force /boot/.../initrd
3. reboot

Actual results:
System boots to shell prompt

Expected results:
System boots normally

Additional info:
Looking at lsinitrd, all symlinks to /usr/bin/busybox are in the initramfs "/", not in /usr/sbin/ or /usr/bin as they were on the previous version. This includes /init being a symlink to /usr/bin/busybox (not to usr/lib/systemd/systemd as it was on the previous version). We're probably booting into busybox's init instead of the intended systemd, which probably tries to spawn a few shells by default.

Looking at upstream commits and --debug output, the find_binary changes in https://github.com/dracutdevs/dracut/commit/a01204202b3014c0c761c93bc7de8bf35e6dc5ef look suspicious. The busybox module calls "ln_r /usr/bin/busybox $_path" after "_path=$(find_binary "$_i")". Running dracut with --debug shows:

//usr/lib/dracut/modules.d/05busybox/module-setup.sh@26(install): find_binary awk
//usr/lib/dracut/dracut-functions.sh@43(find_binary): local _delim
//usr/lib/dracut/dracut-functions.sh@44(find_binary): local l
//usr/lib/dracut/dracut-functions.sh@45(find_binary): local p
//usr/lib/dracut/dracut-functions.sh@46(find_binary): [[ -z awk ]]
//usr/lib/dracut/dracut-functions.sh@46(find_binary): _delim=/
//usr/lib/dracut/dracut-functions.sh@48(find_binary): [[ awk == *.so* ]]
//usr/lib/dracut/dracut-functions.sh@60(find_binary): [[ awk == */* ]]
//usr/lib/dracut/dracut-functions.sh@66(find_binary): for p in $DRACUT_PATH
//usr/lib/dracut/dracut-functions.sh@67(find_binary): [[ -L /sbin/awk ]]
//usr/lib/dracut/dracut-functions.sh@67(find_binary): [[ -x /sbin/awk ]]
//usr/lib/dracut/dracut-functions.sh@66(find_binary): for p in $DRACUT_PATH
//usr/lib/dracut/dracut-functions.sh@67(find_binary): [[ -L /bin/awk ]]
//usr/lib/dracut/dracut-functions.sh@68(find_binary): printf '%s\n' awk
//usr/lib/dracut/dracut-functions.sh@69(find_binary): return 0
/usr/lib/dracut/modules.d/05busybox/module-setup.sh@26(install): _path=awk
/usr/lib/dracut/modules.d/05busybox/module-setup.sh@27(install): '[' -z awk ']'
/usr/lib/dracut/modules.d/05busybox/module-setup.sh@28(install): ln_r /usr/bin/busybox awk
/usr/lib/dracut/dracut-init.sh@1004(ln_r): ln -sfnr /var/tmp/dracut.Xxhyr8/initramfs//usr/bin/busybox /var/tmp/dracut.Xxhyr8/initramfs/awk

find_binary found awk in $dracutsysrootdir/bin/awk, and prints "awk". It looks like it should print "/bin/awk" instead.

Please let me know if you need additional information or logs.