Re: [PATCH] wifi: cfg80211: avoid holding rtnl_mutex across all cfg80211_leave() calls

[Ben Greear <greearb@candelatech.com>]

On 9/5/26 5:25 PM, Ömer Mete Kaya wrote:
> reg_check_chans_work() holds rtnl_mutex for the entire duration of
> iterating over all registered devices and calling cfg80211_leave() on
> each invalid wdev. cfg80211_leave() can be slow (disconnect, stop AP,
> leave mesh), causing rtnl_mutex starvation when many wireless interfaces
> are present. This results in tasks waiting for rtnl_mutex for longer
> than hung_task_timeout_secs:
> 
>    INFO: task hung in inet_rtm_newaddr
>    INFO: task hung in inet6_rtm_newaddr
>    INFO: task hung in nsim_destroy
>    INFO: task hung in tun_chr_close
>    INFO: task hung in switchdev_deferred_process_work

Hello Omer,

Considering that maybe something has mis-diagnosed the problem, could you share details of the stack traces of
the hung processes and lockdep output to see if the hang is actually elsewhere?  What kernel version are you
testing?

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com