[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

            Bug ID: 207497
           Summary: [net80211]: 'uma_zalloc_arg: zone "32" with
                    non-sleepable locks held' when 'sysctl
                    net.wlan.devices' is executed
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: avos at freebsd.org

How-to-reproduce:
# sysctl net.wlan.devices
<some output here>

In dmesg:
uma_zalloc_arg: zone "32" with the following non-sleepable locks held:
exclusive sleep mutex ieee80211com list (ieee80211com list) r = 0 (0xb08e15a4)
locked @ /usr/src/sys/modules/wlan/../../net80211/ieee80211.c:275
stack backtrace:
#0 0xa06fd7c5 at witness_debugger+0x75
#1 0xa06fe9a8 at witness_warn+0x338
#2 0xa083807a at uma_zalloc_arg+0x3a
#3 0xa0684678 at malloc+0x218
#4 0xa06e9fe3 at sbuf_extend+0x63
#5 0xa06e9e2d at sbuf_put_bytes+0x6d
#6 0xa06ea352 at sbuf_putc_func+0x22
#7 0xa06e5b0b at kvprintf+0x99b
#8 0xa06ea3ab at sbuf_printf+0x4b
#9 0xb08667cf at sysctl_ieee80211coms+0xef
#10 0xa06b0bcd at sysctl_root_handler_locked+0xad
#11 0xa06b03e2 at sysctl_root+0x1d2
#12 0xa06b094a at userland_sysctl+0x17a
#13 0xa06b0788 at sys___sysctl+0x98
#14 0xa0899378 at syscall+0x388
#15 0xa0884e7f at Xint0x80_syscall+0x2f

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