[PATCH 0/1] Partial fix for mm/slub regression (LP #1895109)

[Andrea Righi]

On Thu, Sep 10, 2020 at 12:04:05PM +0200, Kleber Sacilotto de Souza wrote:
> [ 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.

Did the bug reporter (or anyone else able to reproduce the oops) test a
kernel with this revert? I don't see any feedback about this in
LP: #1894780.

Thanks,
-Andrea

> 
> [ 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.
> 
> Kleber Sacilotto de Souza (1):
>   UBUNTU: SAUCE: Revert "mm/slub: fix a memory leak in sysfs_slab_add()"
> 
>  mm/slub.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> -- 
> 2.25.1
> 
> 
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