if_ral + wpa_supplicant stack backtrace

[Pascal Hofstee]

Hi,

I am seeing period occurances of the same system call with the same
WITNESS warning and similar backtrace on yesterday's AMD64 CURRENT.

----------------------
ral0: link state changed to DOWN
malloc(M_WAITOK) of "32", forcing M_NOWAIT with the following
non-sleepable locks held:
exclusive sleep mutex ral0 (network driver) r = 0 (0xffffffff80c64de8)
locked @ /usr/src/sys/dev/ral/if_ral.c:2167
KDB: stack backtrace:
kdb_backtrace() at kdb_backtrace+0x37
witness_warn() at witness_warn+0x2c1
uma_zalloc_arg() at uma_zalloc_arg+0x69
malloc() at malloc+0xf5
ieee80211_ioctl_setoptie() at ieee80211_ioctl_setoptie+0x4b
ieee80211_ioctl_set80211() at ieee80211_ioctl_set80211+0x64e
ieee80211_ioctl() at ieee80211_ioctl+0x125
ral_ioctl() at ral_ioctl+0xa4
in_control() at in_control+0xc2f
ifioctl() at ifioctl+0x1f6
soo_ioctl() at soo_ioctl+0x38c
ioctl() at ioctl+0x476
syscall() at syscall+0x332
Xfast_syscall() at Xfast_syscall+0xa8
--- syscall (54, FreeBSD ELF64, ioctl), rip = 0x8007c2d4c, rsp =
0x7fffffffdfd8, rbp = 0x18 ---
ral0: link state changed to UP
----------------------

I am indeed curious to understand what exactly is causing these WITNESS warnings

Regards,
  Pascal Hofstee