Re: [GIT PULL] Networking for v5.15

[Larry Finger]

On 9/1/21 14:49, Johannes Berg wrote:
> On Wed, 2021-09-01 at 12:41 -0700, Jakub Kicinski wrote:
> > > They all seem to have that same issue, and it looks like the fix would
> > > be to get the RTN lock in iwl_mvm_init_mcc(), but I didn't really look
> > > into it very much.
> > >
> > > This is on my desktop, and I actually don't _use_ the wireless on this
> > > machine. I assume it still works despite the warnings, but they should
> > > get fixed.
> > >
> > > I *don't* see these warnings on my laptop where I actually use
> > > wireless, but that one uses ath10k_pci, so it seems this is purely a
> > > iwlwifi issue.
> > >
> > > I can't be the only one that sees this. Hmm?
> >
> > Mm. Looking thru the recent commits there is a suspicious rtnl_unlock()
> > in commit eb09ae93dabf ("iwlwifi: mvm: load regdomain at INIT stage").
>
> Huh! That's not the version of the commit I remember - it had an
> rtnl_lock() in there too (just before the mutex_lock)?! Looks like that
> should really be there, not sure how/where it got lost along the way.
>
> That unbalanced rtnl_unlock() makes no sense anyway. Wonder why it
> doesn't cause more assertions/problems at that point, clearly it's
> unbalanced. Pretty sure it's missing the rtnl_lock() earlier in the
> function for some reason.
>
> Luca and I will look at it tomorrow, getting late here, sorry.
>
> johannes
I am seeing the same problem, and it does happen in lots of places. For example

finger@2603-8090-2005-39b3-0000-0000-0000-1023:~/rtl8812au>dmesg | grep 
assertion\ failed
[    6.465589] RTNL: assertion failed at net/core/rtnetlink.c (1702)
[    6.465948] RTNL: assertion failed at net/core/devlink.c (11496)
[    6.466263] RTNL: assertion failed at net/core/rtnetlink.c (1412)
[    6.466500] RTNL: assertion failed at net/core/dev.c (1987)
[    6.466708] RTNL: assertion failed at net/core/fib_rules.c (1227)
[    6.466902] RTNL: assertion failed at net/ipv4/devinet.c (1526)
[    6.467097] RTNL: assertion failed at net/ipv4/igmp.c (1779)
[    6.467291] RTNL: assertion failed at net/ipv4/igmp.c (1432)

I am in the process of bisecting the problem, just in case it happens some other 
place than your suspicion leads you.

Larry