This bug was initially created as a copy of Bug #2223895 I am copying this bug because: Also applies Description of problem: A customer hit an issue when building the ReaR ISO: the process always fails due to having a `/dev/mqueue/nnsc` which shrinks when being read, causing the verification code to (hopefully) fail. See PR https://github.com/rear/rear/pull/3027 for details and a reproducer. Version-Release number of selected component (if applicable): all rear releases How reproducible: Always using the attached reproducer `shrinking.stp` Steps to Reproduce: 1. Create a file in /dev which will be embedded in the rescue environment # dd if=/dev/urandom of=/dev/shrinking bs=10K count=3 3+0 records in 3+0 records out 30720 bytes (31 kB, 30 KiB) copied, 0.000689566 s, 44.5 MB/s 2. Execute the systemtap script in charge of shrinking the file while being copied # yum -y install systemtap yum-utils # stap-prep # stap -v -g ./shrinking.stp [...] Pass 5: starting run. 3. Execute rear mkrescue from another terminal # rear mkrescue Actual results: ERROR: ReaR recovery system in '/var/tmp/rear.tpfZyNy6ayS53wP/rootfs' not usable (required libraries are missing) Some latest log messages since the last called script 990_verify_rootfs.sh: wipefs is /bin/wipefs mkfs is /bin/mkfs mkfs.xfs is /bin/mkfs.xfs xfs_admin is /bin/xfs_admin mkswap is /bin/mkswap cryptsetup is /bin/cryptsetup dmsetup is /bin/dmsetup ldconfig is /bin/ldconfig Expected results: No error