UDP LOR with the latest RELENG_7

[Vlad GALU]

   As my kernel had started to lock up periodically and I don't have
hands-on access to that machine, I enabled WITNESS.
So these started to pop up:

-- cut here --
--- syscall (97, FreeBSD ELF64, socket), rip = 0x80070427c, rsp =
0x7fffffffe8c8, rbp = 0x516348 ---
uma_zalloc_arg: zone "16" with the following non-sleepable locks held:
exclusive rw udp r = 0 (0xffffffff8064c928) locked @
/usr/src/sys/netinet/udp_usrreq.c:1125
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
witness_warn() at witness_warn+0x241
uma_zalloc_arg() at uma_zalloc_arg+0x290
malloc() at malloc+0x5c
getenv() at getenv+0x93
getenv_quad() at getenv_quad+0x13
getenv_int() at getenv_int+0x15
udp_inpcb_init() at udp_inpcb_init+0x1f
slab_zalloc() at slab_zalloc+0x1ad
uma_zone_slab() at uma_zone_slab+0xb4
uma_zalloc_arg() at uma_zalloc_arg+0x31d
in_pcballoc() at in_pcballoc+0x38
udp_attach() at udp_attach+0x57
socreate() at socreate+0x14f
socket() at socket+0x8a
syscall() at syscall+0x1a9
Xfast_syscall() at Xfast_syscall+0xab
--- syscall (97, FreeBSD ELF64, socket), rip = 0x80070427c, rsp =
0x7fffffffe8c8, rbp = 0x516348 ---
-- and here --

   I tried to see whether bz@ had this one on his page, but his
website is currently being migrated and the list of LORs was
unavailable. Therefore, sorry if this mail is just noise...


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