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Bug 1879046

Summary: parted $disk mklabel fails on newly created scsi_debug empty disk
Product: [Fedora] Fedora Reporter: Katerina Koukiou <kkoukiou>
Component: partedAssignee: Brian Lane <bcl>
Status: CLOSED DUPLICATE QA Contact: Fedora Extras Quality Assurance <extras-qa>
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Last Closed: 2020-09-15 15:43:00 UTC Type: Bug
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Description Katerina Koukiou 2020-09-15 10:20:23 UTC 
Description of problem:
mklabel fails on newly created empty disk with scsi_debug with latest image update.

Version-Release number of selected component (if applicable):

parted-3.3-3.fc32.src.rpm
util-linux-2.35.2-1.fc32.src.rpm

# uname -r
5.8.8-200.fc32.x86_64

How reproducible:
Always


Steps to Reproduce:
1.
#  modprobe scsi_debug dev_size_mb=50

2. Get the created disk name:

# ls /sys/bus/pseudo/drivers/scsi_debug/adapter*/host*/target*/*:*/block
/dev/sda

3.
#  parted /dev/sda mklabel --script msdos
 

Actual results:

Error: Partition(s) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64 on /dev/sda have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot now before making further changes

Additional info:

#  blkid -p /dev/sda

Has not output, so it's empty.

#  dd if=/dev/sda count=1024 | od -x
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
2000000
1024+0 records in
1024+0 records out
524288 bytes (524 kB, 512 KiB) copied, 0.0453846 s, 11.6 MB/s
Comment 1 Katerina Koukiou 2020-09-15 10:22:36 UTC 
Note the blkid command I pasted in additional info section is before the parted /dev/sda mklabel.

Afterward it looks as expected:

blkid -p /dev/sda 
/dev/sda: PTUUID="118df054" PTTYPE="dos"
Comment 2 Brian Lane 2020-09-15 15:43:00 UTC 
This was a kernel bug, try one of the new kernels in testing (see bug#1878858)

*** This bug has been marked as a duplicate of bug 1878858 ***