Public bug reported:
[ Impact ]
As reported on bug 1894780 (Oops and hang when starting LVM snapshots on
5.4.0-47), some changes applied to focal/linux 5.4.0-45 introduced a regression
likely on the mm/slub code. A fix hasn't been identified yet, however,
reverting commit "mm/slub: fix a memory leak in sysfs_slab_add()", upstream
dde3c6b72a16c2db826f54b2d49bdea26c3534a2, applied to focal/linux as part of
v5.4.47 upstream stable release (bug 1884089), seems to improve the situation.
[ Fix ]
I propose to revert commit "mm/slub: fix a memory leak in sysfs_slab_add()"
while we don't find a better fix for it.
[ Test Case ]
Please see bug 1894780.
[ Regression potential ]
The commit being reverted fixes a memory leak from a 2015 commit, so the
chances of reverting it introducing more regressions is low. However, if it
does we can expect issues on the sysfs slab code during memory allocations.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Confirmed
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1895109
Title:
mm/slub kernel oops on focal kernel 5.4.0-45
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