Linux image 5.19 cuts off the build date

[Kian Parvin]

Hi,

The output of uname -a is failing to show the full build date on Jammy 22.04.2 with kernel 5.19 as the string is too long. I believe there is some size limit that is being overrun when building the kernel.

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.2 LTS
Release: 22.04
Codename: jammy

uname -v
#33~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Jan 30 17:03:34 UTC 2

uname -a
Linux kianp 5.19.0-32-generic #33~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Jan 30 17:03:34 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

cat /proc/version
Linux version 5.19.0-32-generic (buildd@lcy02-amd64-026) (x86_64-linux-gnu-gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0, GNU ld (GNU Binutils for Ubuntu) 2.38) #33~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Jan 30 17:03:34 UTC 2

cat /proc/version_signature
Ubuntu 5.19.0-32.33~22.04.1-generic 5.19.17

See above, the build date is missing the year (2023). On an older kernel the output of uname -v is much shorter which leads me to believe some buffer size limit is being hit.

(Older Kernel):
uname -v
#66-Ubuntu SMP Fri Jan 20 14:29:49 UTC 2023

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Andy Whitcroft (apw)]

Yes the version there in /proc/version is from uname -v. The version field in utsname is 64 characters fixed width. This leads to truncation with the longer version on the backport and the very long flags.

[Dimitri John Ledkov (xnox)]

imho i find it weird that PREEMPT_DYNAMIC got added and printed by default in that place on all kernels.

imho PREEMPT_DYNAMIC shouldn't be in the -v output.

is this something we can raise upstream?

[Dimitri John Ledkov (xnox)]

ah, but that will not fix -a output either, so i guess sort of moot.