An upload of coreutils to lunar-proposed has been rejected from the
upload queue for the following reason: "lunar EOL in 9 days; no more
SRUs".
** Changed in: coreutils (Ubuntu Lunar)
Status: In Progress => Won't Fix
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https://bugs.launchpad.net/bugs/2047450
Title:
tail emits no output for sysfs files when using large page kernels
Status in coreutils package in Ubuntu:
Fix Released
Status in coreutils source package in Jammy:
In Progress
Status in coreutils source package in Lunar:
Won't Fix
Status in coreutils source package in Mantic:
In Progress
Status in coreutils source package in Noble:
Fix Released
Bug description:
[Impact]
Ubuntu provides 64K page size kernels for ppc64el (always) and arm64
(optional -64k flavors). When booted on 64K kernels, tail emits no output when
tailing a sysfs file. The difference in behavior can be a source for bugs in
scripts that use tail, and general user confusion.
[Test Plan]
The upstream fix includes a test case that tails the /sys/kernel/profiling
file, if it exists. That case would fail with an unfixed coreutils package as
shown below:
= When booted on a 4K kernel =
ubuntu@gunyolk:~$ tail /sys/kernel/profiling
0
= When booted on a 64K kernel =
ubuntu@gunyolk:~$ tail /sys/kernel/profiling
ubuntu@gunyolk:~$
Since the upstream test cases are executed at build time, the existing
tests and this new test will be used to regression test behavior.
This should cover both 4K (!ppc64el) and 64K (ppc64el) cases. We
should also do a manual verification on arm64 w/ the 64K kernel since
that case is not covered by our builders.
[Where Problems Could Occur]
The biggest risk for a regression I see is due to the side-effect of the fix
now allocating a dynamic buffer instead of the stack. An error in logic there
could cause a crash or a memory leak in scenarios undetected during testing. I
used valgrind when developing the fix to derisk the memory leak scenario.
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