Re: [PATCH v3] mm: process_mrelease: introduce PROCESS_MRELEASE_REAP_KILL flag

[Oleg Nesterov]

In fact I don't even understand the motivation...

On 05/15, Christian Brauner wrote:
>
> On Mon, May 11, 2026 at 02:42:26PM -0700, Minchan Kim wrote:
> > leaving the actual address space teardown (exit_mmap) to be deferred until
> > the mm's reference count drops to zero. In the field (e.g., Android),
> > arbitrary reference counts (reading /proc/<pid>/cmdline, or various other
> > remote VM accesses) frequently delay this teardown indefinitely,

Sure, get_task_cmdline() can delay mmput(). But indefinitely ?

Perhaps the changelog could be more clear? I don't see how any remote VM access
can pin mm->mm_users "indefinitely". Even if, say, a lot of threads read
/proc/<pid>/cmdline in an endless loop in parallel...

I must have missed something.

Oleg.