Re: Observation of a memory leak with commit 314001f0bf92 ("af_unix: Add OOB support")

[Jakub Kicinski]

On Fri, 7 Jan 2022 07:48:46 +0100 Lukas Bulwahn wrote:
> Dear Rao and David,
> 
> 
> In our syzkaller instance running on linux-next,
> https://elisa-builder-00.iol.unh.edu/syzkaller-next/, we have been
> observing a memory leak in prepare_creds,
> https://elisa-builder-00.iol.unh.edu/syzkaller-next/report?id=1dcac8539d69ad9eb94ab2c8c0d99c11a0b516a3,
> for quite some time.
> 
> It is reproducible on v5.15-rc1, v5.15, v5.16-rc8 and next-20220104.
> So, it is in mainline, was released and has not been fixed in
> linux-next yet.
> 
> As syzkaller also provides a reproducer, we bisected this memory leak
> to be introduced with  commit 314001f0bf92 ("af_unix: Add OOB
> support").
> 
> We also tested that reverting this commit on torvalds' current tree
> made the memory leak with the reproducer go away.
> 
> Could you please have a look how your commit introduces this memory
> leak? We will gladly support testing your fix in case help is needed.

Let's test the regression/bug report tracking bot :)

#regzbot introduced: 314001f0bf92