Bug 1968056

Description of problem:
The short version is that https://bugzilla.redhat.com/show_bug.cgi?id=1705320 also applies to up-to-date-as-of-today CentOS Stream 8

For those who don't like clicking links - rpmbuild as root of OpenZFS can result in crashes in strange places and sometimes corruption of the rpmdb, owing to file incorrectly using exit() instead of _exit() in an error handling codepath. The fix is a one-character change.

Version-Release number of selected component (if applicable):
file-5.33-20.el8.x86_64

How reproducible:
It's memory corruption, so not necessarily 100% of the time, but it happened on the first attempt when I tried it.

Steps to Reproduce:
1. Don't have ncompress installed
2. Build OpenZFS RPMs as root (I've been using the "rpm-utils" target)

Actual results:
[...]
Executing(%clean): /bin/sh -e /tmp/zfs-build-root-OKflIeor/TMP/rpm-tmp.o3vTwK
+ umask 022
+ cd /tmp/zfs-build-root-OKflIeor/BUILD
+ cd zfs-2.1.99
+ /usr/bin/rm -rf /tmp/zfs-build-root-OKflIeor/BUILDROOT/zfs-2.1.99-247_g8d5f211fc.el8.x86_64
+ exit 0
Executing(--clean): /bin/sh -e /tmp/zfs-build-root-OKflIeor/TMP/rpm-tmp.OUG5uI
+ umask 022
+ cd /tmp/zfs-build-root-OKflIeor/BUILD
+ rm -rf zfs-2.1.99
+ exit 0
/bin/sh: line 13: 264001 Segmentation fault      (core dumped) LANG=C rpmbuild --define "_tmppath $rpmbuild/TMP" --define "_topdir $rpmbuild" --define "_without_debug 1" --define "_without_debuginfo 1" --define "_without_debug_kmem 1" --define "_without_debug_kmem_tracking 1" --define "_without_asan 1" --define "_initconfdir /etc/sysconfig" --define "_dracutdir /usr/lib/dracut" --define "_udevdir /lib/udev" --define "_udevruledir /lib/udev/rules.d" --with systemd --define "_unitdir /usr/lib/systemd/system" --define "_presetdir /usr/lib/systemd/system-preset" --define "_generatordir /usr/lib/systemd/system-generators" --with pyzfs --rebuild $rpmpkg
make[1]: *** [Makefile:1669: rpm-common] Error 1
make[1]: Leaving directory '/root/zfs_vanilla'
make: *** [Makefile:1624: rpm-utils] Error 2
# rpm -q file
error: rpmdb: BDB0113 Thread/process 264001/140218703545152 failed: BDB1507 Thread died in Berkeley DB library
error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery
error: cannot open Packages index using db5 -  (-30973)
error: cannot open Packages database in /var/lib/rpm
error: rpmdb: BDB0113 Thread/process 264001/140218703545152 failed: BDB1507 Thread died in Berkeley DB library
error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery
error: cannot open Packages index using db5 -  (-30973)
error: cannot open Packages database in /var/lib/rpm
package file is not installed


Expected results:
RPMs generated, no crashing, no rpmdb corruption

Additional info: