Bug 2209602

This bug was initially created as a copy of Bug #2209599

I am copying this bug because: 
I can also reproduce this problem with anaconda-33.16.9.1-1.el8
QEMU command line:
[stdlog]     -blockdev '{"node-name": "file_cd1", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/iso/linux/RHEL-8.9.0-20230524.24-aarch64-dvd1.iso", "cache": {"direct": true, "no-flush": false}}' \
[stdlog]     -blockdev '{"node-name": "drive_cd1", "driver": "raw", "read-only": true, "cache": {"direct": true, "no-flush": false}, "file": "file_cd1"}' \
[stdlog]     -device '{"driver": "scsi-cd", "id": "cd1", "drive": "drive_cd1", "write-cache": "on"}' \
[stdlog]     -blockdev '{"node-name": "file_unattended", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/images/rhel890-aarch64/ks.iso", "cache": {"direct": true, "no-flush": false}}' \
[stdlog]     -blockdev '{"node-name": "drive_unattended", "driver": "raw", "read-only": true, "cache": {"direct": true, "no-flush": false}, "file": "file_unattended"}' \
[stdlog]     -device '{"driver": "scsi-cd", "id": "unattended", "drive": "drive_unattended", "write-cache": "on"}'  \
[stdlog]     -kernel '/home/kvm_autotest_root/images/rhel890-aarch64/vmlinuz'  \
[stdlog]     -append 'inst.sshd inst.repo=cdrom inst.ks=cdrom:/ks.cfg nicdelay=60 net.ifnames=0 console=ttyAMA0,38400'  \
[stdlog]     -initrd '/home/kvm_autotest_root/images/rhel890-aarch64/initrd.img'  \




serial output:
Kernel command line: inst.sshd inst.repo=cdrom inst.ks=cdrom:/ks.cfg nicdelay=60 net.ifnames=0 console=ttyAMA0,38400 initrd=initrd

2023-05-24 04:10:32: [   20.653047] TECH PREVIEW: NVMe/TCP may not be fully supported.
2023-05-24 04:10:32: [   20.653047] Please review provided documentation for limitations.
2023-05-24 04:10:34: [   23.053139] dracut-initqueue[1366]: Warning: no suitable images
2023-05-24 04:10:34: [   23.389548] loop: module loaded
2023-05-24 04:10:34: [   23.393657] loop0: detected capacity change from 0 to 764350464
2023-05-24 04:10:35: [   23.499371] loop1: detected capacity change from 0 to 4294967296
2023-05-24 04:10:35: [   23.551477] loop2: detected capacity change from 0 to 34359738368



Description of problem:
When trying to install a kvm VM, I save the ks.cfg into a cdrom named ks.iso, and append kernel params "inst.repo=cdrom inst.ks=cdrom:/ks.cfg" in the qemu command line, after the VM is started, the anaconda installer cannot be launched.

Version-Release number of selected component (if applicable):
distro: RHEL-9.3.0-20230523.0-aarch64-dvd1.iso
anaconda: anaconda-34.25.3.1-1.el9

How reproducible:
always

Steps to Reproduce:
1. Create a VM with qemu-kvm and contains following lines:
    -blockdev '{"node-name": "file_cd1", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/iso/linux/RHEL-9.3.0-20230523.0-aarch64-dvd1.iso", "cache": {"direct": true, "no-flush": false}}' \
    -blockdev '{"node-name": "drive_cd1", "driver": "raw", "read-only": true, "cache": {"direct": true, "no-flush": false}, "file": "file_cd1"}' \
    -device '{"driver": "scsi-cd", "id": "cd1", "drive": "drive_cd1", "write-cache": "on"}' \
    -blockdev '{"node-name": "file_unattended", "driver": "file", "auto-read-only": true, "discard": "unmap", "aio": "threads", "filename": "/home/kvm_autotest_root/images/rhel930-aarch64/ks.iso", "cache": {"direct": true, "no-flush": false}}' \
    -blockdev '{"node-name": "drive_unattended", "driver": "raw", "read-only": true, "cache": {"direct": true, "no-flush": false}, "file": "file_unattended"}' \
    -device '{"driver": "scsi-cd", "id": "unattended", "drive": "drive_unattended", "write-cache": "on"}'  \
    -kernel '/home/kvm_autotest_root/images/rhel930-aarch64/vmlinuz'  \
    -append 'inst.sshd inst.repo=cdrom inst.ks=cdrom:/ks.cfg net.ifnames=0 inst.wait_for_disks=30 console=ttyAMA0,38400'  \
    -initrd '/home/kvm_autotest_root/images/rhel930-aarch64/initrd.img'  \

2. Check the serial output
2023-05-24 03:24:15:          Starting ^[[0;1;39mDevice-Mapper Multipath Device Controller^[[0m...
2023-05-24 03:24:15: [^[[0;32m  OK  ^[[0m] Started ^[[0;1;39mDevice-Mapper Multipath Device Controller^[[0m.
2023-05-24 03:24:15: [^[[0;32m  OK  ^[[0m] Reached target ^[[0;1;39mPreparation for Local File Systems^[[0m.
2023-05-24 03:24:15: [^[[0;32m  OK  ^[[0m] Reached target ^[[0;1;39mLocal File Systems^[[0m.
2023-05-24 03:24:15: [^[[0;32m  OK  ^[[0m] Reached target ^[[0;1;39mSystem Initialization^[[0m.
2023-05-24 03:24:15: [^[[0;32m  OK  ^[[0m] Reached target ^[[0;1;39mBasic System^[[0m.
2023-05-24 03:24:15: Please insert CDROM containing '/ks.cfg'...
2023-05-24 03:24:18: [   13.328221] dracut-initqueue[1467]: Warning: no suitable images
2023-05-24 03:24:18: [   13.753371] loop: module loaded
2023-05-24 03:24:18: [   13.756529] loop0: detected capacity change from 0 to 1505264
2023-05-24 03:24:18: [   13.767720] loop1: detected capacity change from 0 to 6291456
2023-05-24 03:24:18: [   13.779368] loop2: detected capacity change from 0 to 67108864
3.

Actual results:
anaconda cannot find the ks.cfg in the cdrom, the installer failed to be launched.

Expected results:
the installer can be launched.

Additional info:
1. By default, "inst.wait_for_disks=5", if I add "inst.wait_for_disks=0", the problem is gone.

2023-05-24 04:01:49: [^[[0;32m  OK  ^[[0m] Reached target ^[[0;1;39mSystem Initialization^[[0m.
2023-05-24 04:01:49: [^[[0;32m  OK  ^[[0m] Started ^[[0;1;39mDaily Cleanup of Temporary Directories^[[0m.
2023-05-24 04:01:49: [^[[0;32m  OK  ^[[0m] Reached target ^[[0;1;39mTimer Units^[[0m.
2023-05-24 04:01:49: [^[[0;32m  OK  ^[[0m] Listening on ^[[0;1;39mD-Bus System Message Bus Socket^[[0m.
2023-05-24 04:01:49: [^[[0;32m  OK  ^[[0m] Listening on ^[[0;1;39mOpen-iSCSI iscsid Socket^[[0m.
2023-05-24 04:01:49: [^[[0;32m  OK  ^[[0m] Listening on ^[[0;1;39mOpen-iSCSI iscsiuio Socket^[[0m.
2023-05-24 04:01:49: [^[[0;32m  OK  ^[[0m] Reached target ^[[0;1;39mSocket Units^[[0m.
2023-05-24 04:01:49:          Starting ^[[0;1;39mD-Bus System Message Bus^[[0m...
2023-05-24 04:01:49: [^[[0;32m  OK  ^[[0m] Started ^[[0;1;39mD-Bus System Message Bus^[[0m.
2023-05-24 04:01:49: [^[[0;32m  OK  ^[[0m] Reached target ^[[0;1;39mBasic System^[[0m.
2023-05-24 04:01:49:          Starting ^[[0;1;39mAnaconda NetworkManager configuration^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mNetworkManager auda installation environment^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mpre-anaconda logging service^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mRestore /run/initramfs on shutdown^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mHold until boot process finishes up^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mTerminate Plymouth Boot Screen^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mSystem Logging Service^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mOpenSSH ecdsa Server Key Generation^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mOpenSSH ed25519 Server Key Generation^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mOpenSSH rsa Server Key Generation^[[0m...
2023-05-24 04:01:49:          Starting ^[[0;1;39mUser Login Management^[[0m...
...
...
2023-05-24 04:01:57:  * shell is available on TTY2
2023-05-24 04:01:57:  * when reporting a bug add logs from /tmp as separate text/plain attachments
2023-05-24 04:02:12: Queued start job for default target Main User Target.
2023-05-24 04:02:12: Startup finished in 404ms.

2. If using "inst.ks=https://xxx", cannot trigger this problem.