Re: [RT v5.11-rt7] WARNING at include/linux/seqlock.h:271 nft_counter_eval

[Sebastian Andrzej Siewior]

On 2021-02-23 11:49:07 [+0100], Juri Lelli wrote:
> Hi,
Hi,

> I'm seeing the following splat right after boot (or during late boot
> phases) with v5.11-rt7 (LOCKDEP enabled).
…
> [   85.273588] WARNING: CPU: 5 PID: 1416 at include/linux/seqlock.h:271 nft_counter_eval+0x95/0x130 [nft_counter]
…
> [   85.273713] RIP: 0010:nft_counter_eval+0x95/0x130 [nft_counter]

This is a per-CPU seqcount_t in net/netfilter/nft_counter.c which is
only protected by local_bh_disabled(). The warning expects preemption
to be disabled which is the case on !RT but not on RT.

Not sure what to do about this. It is doing anything wrong as of now. It
is noisy.

> Best,
> Juri

Sebastian