[Bug 207497] [net80211]: 'uma_zalloc_arg: zone "32" with non-sleepable locks held' when 'sysctl net.wlan.devices' is executed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207497

--- Comment #1 from Andriy Voskoboinyk <avos at freebsd.org> ---
(Probably, an inelegant) way to fix this issue:
1) lock the mutex;
2) count needed size by iterating over ic_head list;
3) allocate required memory;
4) copy all names to it (yet another iteration);
5) unlock the mutex;
6) pass the data to SYSCTL_OUT()
7) free the memory.

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