netdev - Re: [PATCH v4 net 0/3] udp: Fix two integer overflows when sk->sk_rcvbuf is close to INT

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Message-ID: <20250331162941.01e14713@kernel.org>
Date: Mon, 31 Mar 2025 16:29:41 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Kuniyuki Iwashima <kuniyu@...zon.com>, <willemdebruijn.kernel@...il.com>
Cc: <davem@...emloft.net>, <dsahern@...nel.org>, <edumazet@...gle.com>,
 <horms@...nel.org>, <kuni1840@...il.com>, <netdev@...r.kernel.org>,
 <pabeni@...hat.com>
Subject: Re: [PATCH v4 net 0/3] udp: Fix two integer overflows when
 sk->sk_rcvbuf is close to INT_MAX.

On Mon, 31 Mar 2025 13:31:47 -0700 Kuniyuki Iwashima wrote:
> > > Please do test locally if you can.  
> > 
> > Sure, will try the same tests with CI.  
> 
> Is there a way to tell NIPA to run a test in a dedicated VM ?
> 
> I see some tests succeed when executed solely but fail when
> executed with
> 
>   make -C tools/testing/selftests/ TARGETS=net run_tests
> 
> When combined with other tests, assuming that the global UDP usage
> will soon drop to 0 is not always easy... so it's defeating the
> purpose but I'd drop the test in v5 not to make CI unhappy.

Can we account for some level of system noise? Or try to dump all 
the sockets and count the "accounted for" in-use memory?

We can do various things in NIPA, but I'm not sure if it's okay 
for tests inside net/ should require a completely idle system.
If we want a completely idle system maybe user-mode Linux + kunit
is a better direction?

Willem, WDYT?